Martensnaias Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 38.
(intro'd as sub-gen. of Elliptio Rafinesque, 1819)
Type species: Unio rubicundus Martens, 1900 (orig. desig.) = Martensnaias rubicunda

Reticulatus Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 10 [as ‘Reticulata’], 38.
(intro'd as sub-gen. of Elliptio Rafinesque, 1819)
Type species: Nephronaias reticulatus Simpson, 1900 (orig. desig.) = Reticulatus reticulatus

Nephritica Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 38.
(intro'd as sub-gen. of Elliptio Rafinesque, 1819)
Type species: Unio poeyanus Lea, 1857 (orig. desig.) = Nephritica poeyana

Elliptoideus Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 33.
(intro'd as sub-gen. of Elliptio Rafinesque, 1819)
Type species: Unio sloatianus Lea, 1840 (orig. desig.) = Elliptoideus sloatianus

Ortmanniana Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 79.
(intro'd as sub-gen. of Lampsilis Rafinesque, 1820)
Type species: Unio carinatus Barnes, 1823 (original designation) = Ortmanniana ligamentina

Villosa Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 80.
(intro'd as sub-gen. of Lampsilis Rafinesque, 1820)
Type species: Unio villosus B.H. Wright, 1898 (orig. desig.) = Villosa villosa

Venustaconcha Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: errata et corrigenda.
Thiele, 1934, Handb. Syst. Weichtierk. 3: 837 [1273].
(new name for Venusta Frierson, 1927)

Venusta Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 81.
(homonym of O. Boettger, 1877 [Gastro.]; intro'd as sub-gen. of Lampsilis Rafinesque, 1820; renamed Venustaconcha Frierson, 1927)
Type species: Unio venustus Lea, 1838 (orig. desig.) = Venustaconcha ellipsiformis

Eurynaia Frierson, 1927
‘Rafinesque’ Frierson, 1927, Check List N. Amer. Naiades: 10, 33.
(intro'd as sub-gen. of Elliptio Rafinesque, 1819; error for Eurynia Rafinesque, 1820)

Fusconia Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 10, 54.
(error for Fusconaia Simpson, 1900)

Capsaeformis Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 95.
(intro'd as sub-gen. of Dysnomia Agassiz, 1852)
Type species: Unio capsaeformis Lea, 1834 (orig. desig.) = Epioblasma capsaeformis

Penita Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 93.
(intro'd as sub-gen. of Dysnomia Agassiz, 1852)
Type species: Unio penitus Conrad, 1834 (orig. desig.) = Epioblasma penita

Torulosa Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 94.
(intro'd as sub-gen. of Dysnomia Agassiz, 1852)
Type species: Amblema torulosa Rafinesque, 1820 (orig. desig.) = Epioblasma torulosa

Utterbackiana Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 17.
(intro'd as sub-gen. of Anodonta Lamarck, 1799)
Type species: Anodonta suborbiculata Say, 1831 (orig. desig.) = Utterbackiana suborbiculata

Pseudodontoideus Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 23.
(intro'd as sub-gen. of Strophitus Rafinesque, 1820)
Type species: Margaritana alabamensis Lea, 1861 (orig. desig.) = Pseudodontoideus connasaugaensis

Delphinonais Frierson, 1927
‘Crosse & Fischer’ Frierson, 1927, Check List N. Amer. Naiades: 84.
(error for Delphinonaias Fischer & Crosse, 1894)

Cyrtonais Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 84.
(error for Cyrtonaias Fischer & Crosse, 1894)

Obliquata Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 52.
(intro'd as sub-gen. of Quadrula Rafinesque, 1820)
Type species: Obliquaria (Scalenaria) obliquata Rafinesque, 1820 (orig. desig.) = Epioblasma obliquata

Bullata Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 48.
(homonym of Jousseaume, 1875 [Gastr.]; intro'd as sub-gen. of Quadrula Rafinesque, 1820; renamed Pustulosa Frierson, 1927)
Type species: Obliquaria (Quadrula) bullata Rafinesque, 1820 (original designation) = Pustulosa pustulosa

Pustulosa Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: errata et corrigenda.
Thiele, 1934, Handb. Syst. Weichtierk. 3: 827 [1260].
(intro'd as sub-gen. of Quadrula Rafinesque, 1820; new name for Bullata Frierson, 1927)

Striata Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 50.
(homonym of O. Boettger, 1878 [Gastro.]; intro'd as sub-gen. of Quadrula Rafinesque, 1820; renamed Luteacarnea Frierson, 1927)
Type species: Obovaria striata Rafinesque, 1820 (orig. desig.) = Obovaria subrotunda

Luteacarnea Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: errata et corrigenda.
(intro'd as sub-gen. of Quadrula Rafinesque, 1820; new name for Striata Frierson, 1927)

Pleuronaia Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 58.
(intro'd as sub-gen. of Quadrula Rafinesque, 1820; correct name for Pleuronia Frierson, 1927)
Type species: Unio barnesianus Lea, 1838 (orig. desig.) = Pleuronaia barnesiana

Pleuronia Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 10.
(incorrect original spelling of Pleuronaia Frierson, 1927)
Type species: Unio barnesianus Lea, 1838 () = Pleuronaia barnesiana

Subtentus Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 65.
(intro'd as sub-gen. of Ptychobranchus Simpson, 1900)
Type species: Unio subtentus Say, 1825 (orig. desig.) = Ptychobranchus subtentus

Popenaias Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 38.
(intro'd as sub-gen. of Elliptio Rafinesque, 1819)
Type species: Unio popeii Lea, 1857 (orig. desig.) = Popenaias popeii

Anodonta pennsylvanica Stark, 1828
‘Lamarck’ of Authors.
Stark, 1828, Elements Nat. Hist. 2: 89.
Lea, 1836, Synopsis Fam. Naiades: 50.
Lea, 1838, Synopsis Fam. Naiades: 30.
Lea, 1852, Synopsis Fam. Naiades: 49.
Conrad, 1853, Proc. Acad. Nat. Sci. 6: 263.
Sowerby, 1867, Conch. Icon. 17: pl. 11, sp. 30.
Lea, 1870, Synopsis Fam. Naiades: 79.
Simpson, 1900, Proc. U.S. Nat. Mus. 22: 618.
Ortmann & Walker, 1922, Occ. Pap. Mus. Zool. Univ. Mich. (112): 40.
Frierson, 1927, Check List N. Amer. Naiades: 22 [as ‘Strophitus undulatus-pennsylvanicus’].
Haas, 1969, Das Tierreich 88: 373 [as ‘Strophitus undulatus pennsylvanicus’].
(error for Anodonta pensylvanica Lamarck, 1819)

Quadrula lachrymosa Swainson, 1840
‘Lea’ of Authors.
Swainson, 1840, Treat. Malacol.: 378.
Hanley, 1843, Illustr. Descr. Cat. Rec. Bivalve Shells: 177.
Conrad, 1853, Proc. Acad. Nat. Sci. 6: 256.
Adams & Adams, 1857, Gen. Rec. Moll. 2(31-32): 497.
Reeve, 1864, Conch. Icon. 16: pl. 9, sp. 33.
Call, 1895, Trans. Acad. Sci. St. Louis 7: 21.
F.C. Baker, 1898, Bull. Chicago Acad. Sci. 3(1): 83, pl. 25, fig. 1; pl. 12, fig. 2.
Simpson, 1900, Proc. U.S. Nat. Mus. 22: 776.
Call, 1900, Ind. Dept. Geol. Nat. Res. (1899): 489.
Ortmann, 1909, Nautilus 22(10): 100.
Ortmann, 1909, Ann. Carnegie Mus. 5: 199.
Ortmann, 1910, Nautilus 23(11): 140.
Ortmann, 1910, Nautilus 23: 116.
Ortmann, 1912, Ann. Carnegie Mus. 8: 253.
Simpson, 1914, Descr. Cat. Naiades: 839, 841.
Vanatta, 1915, Proc. Acad. Nat. Sci. 67: 556.
Ortmann & Walker, 1922, Occ. Pap. Mus. Zool. Univ. Mich. (112): 14, 16.
Frierson, 1927, Check List N. Amer. Naiades: 47.
F.C. Baker, 1928, Bull. Wisconsin Geol. Nat. Hist. Survey 70(2): 84.
R.I. Johnson, 1980, Bull. MCZ 149(2): 90.
Vidrine, 1993, Histr. Distr. Freshw. Mussels LA: 53.
Strayer & Jirka, 1997, Pearly Mussels NY (26): 98.
(error for Unio lacrymosus Lea, 1828)

Margaritana curreyana Lea, 1842
‘Lea’ of Authors.
Lea, 1842, Trans. Amer. Phil. Soc. 8 [O. 3]: pl. 18, fig. 40.
Agassiz, 1852, Arch. Naturg. 18(1): 47.
Lea, 1852, Synopsis Fam. Naiades: 42.
Conrad, 1853, Proc. Acad. Nat. Sci. 6: 263.
Adams & Adams, 1857, Gen. Rec. Moll. 2(31-32): 499.
Sowerby, 1868, Conch. Icon. 16: pl. 63, sp. 319.
Lea, 1870, Synopsis Fam. Naiades: 68.
B.H. Wright, 1888, Check List N. Amer. Unionidae etc.: [6].
Simpson, 1900, Proc. U.S. Nat. Mus. 22: 661.
Simpson, 1914, Descr. Cat. Naiades: 474.
Frierson, 1927, Check List N. Amer. Naiades: 21.
Haas, 1969, Das Tierreich 88: 395.
(error for Margaritana curreyiana Lea, 1840)

Anodonta nuttaliana Hanley, 1843
‘Lea’ of Authors.
Hanley, 1843, Illustr. Descr. Cat. Rec. Bivalve Shells: 216.
Frierson, 1927, Check List N. Amer. Naiades: 14.
Turgeon et al., 1988, Am. Fisher. Soc. Spec. Publ. (16): 28.
Williams et al., 1993, Fisheries 18(9): 10.
(error for Anodonta nuttalliana Lea, 1838)

Unio hippopaeus Lea, 1852
‘Lea’ of Authors.
Lea, 1852, Synopsis Fam. Naiades: 21 [as ‘hippopæus’].
Conrad, 1853, Proc. Acad. Nat. Sci. 6: 261 [as ‘hippopæus’].
Adams & Adams, 1857, Gen. Rec. Moll. 2(31-32): 497 [as ‘hippopæus’].
Reeve, 1864, Conch. Icon. 16: pl. 11, sp. 40 [as ‘hippopæus’].
Lea, 1870, Synopsis Fam. Naiades: 31 [as ‘hippopæus’].
B.H. Wright, 1888, Check List N. Amer. Unionidae etc.: [3], [as ‘hippopæus’].
Simpson, 1900, Proc. U.S. Nat. Mus. 22: 767 [as ‘hippopæa’].
Ortmann, 1909, Nautilus 22(10): 101 [as ‘Q. hippopæa’].
Ortmann, 1909, Ann. Carnegie Mus. 5: 203 [as ‘Quadrula undulata hippopæa’].
Simpson, 1914, Descr. Cat. Naiades: 816 [as ‘hippopæa’].
Frierson, 1927, Check List N. Amer. Naiades: 61.
Haas, 1969, Das Tierreich 88: 287.
Clarke, 1973, Malacologia 13(1-2): 35.
Burch, 1975, Freshw. Unio. North Amer.: 165.
Strayer & Jirka, 1997, Pearly Mussels NY (26): 98.
He & Zhuang, 2013, Freshwater Bivalves China: 27.
(error for Unio hippopoeus Lea, 1845)

Unio sowerbyanus Küster, 1852
‘Lea’ of Authors.
Küster, 1852, Conchyl. Cab. 9(2): 62.
Agassiz, 1852, Arch. Naturg. 18(1): 43.
Reeve, 1864, Conch. Icon. 16: pl. 14, sp. 58.
Simpson, 1900, Proc. U.S. Nat. Mus. 22: 520.
Simpson, 1914, Descr. Cat. Naiades: 17.
Frierson, 1927, Check List N. Amer. Naiades: 94.
Haas, 1969, Das Tierreich 88: 483.
Burch, 1975, Freshw. Unio. North Amer.: 173.
R.I. Johnson, 1978, Bull. MCZ 148: 280.
Parmalee & Bogan, 1998, The Freshwater Mussels of Tennessee: 91.
(error for Unio sowerbianus Lea, 1834)

Unio reevianus Conrad, 1853
‘Lea’ of Authors.
Conrad, 1853, Proc. Acad. Nat. Sci. 6: 256.
Simpson, 1900, Proc. U.S. Nat. Mus. 22: 538.
Simpson, 1914, Descr. Cat. Naiades: 74.
Utterback, 1916, Amer. Midl. Nat. 4(10): 449.
Frierson, 1927, Check List N. Amer. Naiades: 73.
Haas, 1969, Das Tierreich 88: 437.
R.I. Johnson, 1980, Bull. MCZ 149(2): 132.
Oesch, 1984, Missouri Naiades: 225.
Turgeon et al., 1988, Am. Fisher. Soc. Spec. Publ. (16): 31.
Williams et al., 1993, Fisheries 18(9): 12.
Turgeon et al., 1998, Am. Fisher. Soc. Spec. Publ. (26): 35.
Graf & Cummings, 2007, J. Moll. Studies 73: 305.
Bogan, 2010, FADA: [web].
Cummings & Graf, 2010, Ecol. Class. N. Amer. FW Inverts.: 376.
Haag, 2012, N. Amer. Freshw. Mussels: 71 [as ‘Lampsilis reeviana’].
(error for Unio reeveianus Lea, 1852)

Anodonta linneana Conrad, 1853
‘Lea’ of Authors.
Conrad, 1853, Proc. Acad. Nat. Sci. 6: 264.
Hanley, 1856, Cat. Rec. Bivalve Shells, Suppl.: 387.
Sowerby, 1870, Conch. Icon. 17: pl. 35, sp. 144.
Simpson, 1900, Proc. U.S. Nat. Mus. 22: 646.
Simpson, 1914, Descr. Cat. Naiades: 431.
Frierson, 1927, Check List N. Amer. Naiades: 14.
Haas, 1969, Das Tierreich 88: 364.
Parmalee & Bogan, 1998, The Freshwater Mussels of Tennessee: 206.
Watters et al., 2009, Freshw. Mussels OH: 260.
(error for Anodonta linnaeana Lea, 1852)

Unio hanleyanus Conrad, 1853
‘Lea’ of Authors.
Conrad, 1853, Proc. Acad. Nat. Sci. 6: 250.
Sowerby, 1866, Conch. Icon. 16: pl. 46, sp. 249.
B.H. Wright, 1888, Check List N. Amer. Unionidae etc.: [3].
Simpson, 1900, Proc. U.S. Nat. Mus. 22: 759.
Simpson, 1914, Descr. Cat. Naiades: 780.
Frierson, 1927, Check List N. Amer. Naiades: 42, sp. 175.
Haas, 1969, Das Tierreich 88: 256.
Burch, 1975, Freshw. Unio. North Amer.: 13.
Turgeon et al., 1988, Am. Fisher. Soc. Spec. Publ. (16): 32.
Williams et al., 1993, Fisheries 18(9): 13.
Parmalee & Bogan, 1998, The Freshwater Mussels of Tennessee: 184.
Lydeard et al., 1999, Gulf Mex. Sci. 17(2): 129.
(error for Unio hanleyianus Lea, 1852)

Unio leseurianus Conrad, 1853
‘Lea’ of Authors.
Conrad, 1853, Proc. Acad. Nat. Sci. 6: 251.
Frierson, 1927, Check List N. Amer. Naiades: 56.
(error for Unio lesueurianus Lea, 1840)

Unio whiteanus Conrad, 1853
‘Lea’ of Authors.
Conrad, 1853, Proc. Acad. Nat. Sci. 6: 260.
Frierson, 1927, Check List N. Amer. Naiades: 28.
(error for Unio whiteianus Lea, 1852)

Anodonta salmonea Sowerby, 1867
‘Lea’ of Authors.
Sowerby, 1867, Conch. Icon. 17: pl. 19, sp. 74.
Frierson, 1927, Check List N. Amer. Naiades: 15.
F.C. Baker, 1928, Bull. Wisconsin Geol. Nat. Hist. Survey 70(2): 155.
(error for Anodonta salmonia Lea, 1838)

Unio inusitatus Lea, 1870
‘Lea’ Lea, 1870, Synopsis Fam. Naiades: 51.
‘Lea’ Frierson, 1927, Check List N. Amer. Naiades: 31.
(error for Unio inusitatis Lea, 1859)

Unio bissellianus Lea, 1870
‘Lea’ of Authors.
Lea, 1870, Synopsis Fam. Naiades: 50.
Simpson, 1900, Proc. U.S. Nat. Mus. 22: 743.
Simpson, 1914, Descr. Cat. Naiades: 714.
Frierson, 1927, Check List N. Amer. Naiades: 35.
Haas, 1969, Das Tierreich 88: 210.
(error for Unio bisselianus Lea, 1867)

Margaron (Anodonta) marryatana Lea, 1870
‘Lea’ of Authors.
Lea, 1870, Synopsis Fam. Naiades: 82.
B.H. Wright, 1888, Check List N. Amer. Unionidae etc.: [7] [as ‘Anodonta marryatana’].
Frierson, 1927, Check List N. Amer. Naiades: 15.
(error for Anodonta maryattana Lea, 1840)

Anodonta shafferiana Lea, 1870
‘Lea’ of Authors.
Lea, 1870, Synopsis Fam. Naiades: 81.
Clessin, 1873, Conchyl. Cab. 9(1): 243, pl. 17, figs. 5-7.
B.H. Wright, 1888, Check List N. Amer. Unionidae etc.: [7].
Call, 1895, Trans. Acad. Sci. St. Louis 7: 60.
Utterback, 1916, Amer. Midl. Nat. 4(7): 311.
Frierson, 1927, Check List N. Amer. Naiades: 23.
(error for Anodonta shaefferiana Lea, 1852)

Unio hazelhurstianus B.H. Wright, 1888
‘Lea’ of Authors.
B.H. Wright, 1888, Check List N. Amer. Unionidae etc.: [3].
Simpson, 1900, Proc. U.S. Nat. Mus. 22: 719 [as ‘Unio (sec. Elliptio) hazelhurstianus’].
Simpson, 1914, Descr. Cat. Naiades: 648.
Frierson, 1927, Check List N. Amer. Naiades: 29 [as ‘Elliptio (Elliptio) hazelhurstianus’].
Haas, 1969, Das Tierreich 88: 229 [as ‘Elliptio (Elliptio) hazelhurstianus’].
R.I. Johnson, 1970, Bull. MCZ 140(6): 333.
Burch, 1975, Freshw. Unio. North Amer.: 164.
(error for Unio hazlehurstianus Lea, 1858)

Quadrula (Pleuronaia) meridithii B.H. Wright, 1888
‘Lea’ of Authors.
B.H. Wright, 1888, Check List N. Amer. Unionidae etc.: [4].
Frierson, 1927, Check List N. Amer. Naiades: 58, sp. 253.
(error for Unio meredithii Lea, 1858)

Unio mellinus Paetel, 1890
‘Conrad’ of Authors.
Paetel, 1890, Cat. Conch.-Samml. 3: 159.
Frierson, 1927, Check List N. Amer. Naiades: 72, sp. 316a.
(error for Unio melinus Conrad, 1838)

Unio popeii Fischer & Crosse, 1894
of Authors.
Fischer & Crosse, 1894, Miss. Sci. Mexique, Rech. Zool. 2(16): 605 [as ‘Unio (Graphonaias) popei’].
Martens, 1900, Biol. Centr.-Amer., Moll.: 504 [as ‘Unio (Nephronaias) popei’].
Simpson, 1900, Proc. U.S. Nat. Mus. 22: 738 [as ‘Unio (sec. Elliptio)’]. [in part]
Pilsbry, 1910, Proc. Acad. Nat. Sci. 61: 535. [in part]
Ortmann, 1912, Ann. Carnegie Mus. 8: 271 [as ‘Elliptio’].
Simpson, 1914, Descr. Cat. Naiades: 700 [as ‘Unio (sec. Elliptio)’]. [in part]
Frierson, 1927, Check List N. Amer. Naiades: 38 [as ‘Elliptio (Popenaias)’]. [in part]
Haas, 1929, Senckenbergiana 11: 330 [as ‘Elliptio (Popenaias)’]. [in part]
Haas, 1969, Das Tierreich 88: 201 [as ‘Nephronaias (Popenaias)’]. [in part]
Graf & Cummings, 2007, J. Moll. Studies 73: 308 [as ‘Popenaias’]. [in part]
Pfeiffer et al., 2019, Zool. Scripta 48: 504 [as ‘Popenaias’]. [in part]
(misidentified reference to Unio popeii Lea, 1857)

Unio (Lampsilis) amphichaena Frierson, 1898
Frierson, 1898, Nautilus 11(10): 109, pl. 1.
Frierson, 1927, Check List N. Amer. Naiades: 87, sp. 395.
Type(s): HOLOTYPE USNM_159935, Sabine R., Logansport, La.

Unio (Pleurobema) hagleri Frierson, 1900
Frierson, 1900, Nautilus 13(10): 109, pl. 2.
Frierson, 1927, Check List N. Amer. Naiades: 41, sp. 169.
Type(s): LECTOTYPE ANSP_77902, North River, nr. Tynes, Ala.

Unio panucoensis Martens, 1900
‘von dem Busch’ of Authors.
Martens, 1900, Biol. Centr.-Amer., Moll.: 510.
Pilsbry, 1910, Proc. Acad. Nat. Sci. 61: 533.
Simpson, 1914, Descr. Cat. Naiades: 603.
Frierson, 1927, Check List N. Amer. Naiades: 82.
(error for Unio panacoensis Philippi, 1843)

Anodonta jewittiana Simpson, 1900
‘Lea’ of Authors.
Simpson, 1900, Proc. U.S. Nat. Mus. 22: 927.
Frierson, 1927, Check List N. Amer. Naiades: 97.
(error for Anodonta jewettiana Lea, 1868)

Anodonta jewittii Simpson, 1900
‘Lea’ of Authors.
Simpson, 1900, Proc. U.S. Nat. Mus. 22: 927.
Frierson, 1927, Check List N. Amer. Naiades: 97.
‘Lea’ Haas, 1931, Senckenbergiana 13: 99.
(error for Anodonta jewettii Lea, 1868)

Unio cistelliformis Simpson, 1900
‘Lea’ of Authors.
Simpson, 1900, Proc. U.S. Nat. Mus. 22: 716.
Simpson, 1914, Descr. Cat. Naiades: 641.
Frierson, 1927, Check List N. Amer. Naiades: 29.
Haas, 1969, Das Tierreich 88: 228.
R.I. Johnson, 1970, Bull. MCZ 140(6): 317.
Davis et al., 1981, Biol. J. Linn. Soc. 15: 135.
Davis, 1984, Malacologia 25(2): 631.
Williams et al., 1993, Fisheries 18(9): 11.
Haag, 2012, N. Amer. Freshw. Mussels: 73.
(error for Unio cistellaeformis Lea, 1863)

Unio zonata Simpson, 1900
‘Rafinesque’ of Authors.
Simpson, 1900, Proc. U.S. Nat. Mus. 22: 744.
Simpson, 1914, Descr. Cat. Naiades: 731.
Frierson, 1927, Check List N. Amer. Naiades: 90.
(error for Unio (Aximedia) zonalis Rafinesque, 1820)

Margaritana etowahensis Simpson, 1900
‘Conrad’ of Authors.
Simpson, 1900, Proc. U.S. Nat. Mus. 22: 672.
Simpson, 1914, Descr. Cat. Naiades: 510.
Frierson, 1927, Check List N. Amer. Naiades: 19.
(error for Margaritana etowaensis Conrad, 1849)

Unio averillii Simpson, 1900
“Wright” of Authors.
Simpson, 1900, Proc. U.S. Nat. Mus. 22: 560.
Simpson, 1914, Descr. Cat. Naiades: 138.
Frierson, 1927, Check List N. Amer. Naiades: 76.
R.I. Johnson, 1970, Bull. MCZ 140(6): 373.
R.I. Johnson, 1972, Bull. Fla. State Mus. 16(4): 237.
Burch, 1975, Freshw. Unio. North Amer.: 159.
(error for Unio averellii B.H. Wright, 1888)

Quadrula trapezoides var. pentagonoides Frierson, 1902
Frierson, 1902, Nautilus 16: 39.
Frierson, 1927, Check List N. Amer. Naiades: 62 [as ‘A. (Plectomerus) dombeyana’].
(intro'd as intra-sp. of Unio trapezoides Lea, 1831)
Type(s): LECTOTYPE ANSP_128928, Lake Charles, La.

Lampsilis fimbriata Frierson, 1907
Frierson, 1907, Nautilus 21(8): 86, pl. 12, two upper figs. & lower left one.
Frierson, 1927, Check List N. Amer. Naiades: 83, sp. 363.
Type(s): HOLOTYPE (ORIG. DESIG.) UMMZ_91161, Valles River, Mexico.

Pleurobema tombigbeanum Frierson, 1908
Frierson, 1908, Nautilus 22(3): 27, pl. 3, figs. 3-4.
Frierson, 1927, Check List N. Amer. Naiades: 42 [under P. taitianum Lea].

Unio detectus Frierson, 1911
Frierson, 1911, Nautilus 25(5): 52, pls. 2 , lower fig.; pl. 3, upper fig.
Frierson, 1927, Check List N. Amer. Naiades: 45, sp. 202.
Type(s): HOLOTYPE UMMZ_81937, Ohio River.

Unio (Obovaria) jacksoniana Frierson, 1912
Frierson, 1912, Nautilus 26(2): 23, pl. 3, figs. 1-3.
Frierson, 1927, Check List N. Amer. Naiades: 91, sp. 412.
Type(s): LECTOTYPE ANSP_106063, Pearl R., Miss.

Unio (Nephronaias) ortmanni Frierson, 1913
Frierson, 1913, Nautilus 27(2): 14, pl. 2.
Frierson, 1927, Check List N. Amer. Naiades: 36 [as ‘E. (Nephronaias) sphenorhynchus Cr. & Fisch. 1893’].
Type(s): PARATYPES MCZ_20916, Conchins River, Guatemala.

Fusconaia undata trigonoides Utterback, 1915
‘Frierson, MS’ Utterback, 1915, Amer. Midl. Nat. 4(4): 107, pl. 15, figs. 30A-D; pl. 4, figs. 9a-b.
Frierson, 1927, Check List N. Amer. Naiades: 55, sp. 232d.
(intro'd as intra-sp. of Unio undatus Barnes, 1823)

Pleurobema utterbackii Utterback, 1915
Frierson in Utterback, 1915, Amer. Midl. Nat. 4(5): 197, pl. 5, fig. 12a-b; pl 20, figs. 63A-D.
Frierson, 1927, Check List N. Amer. Naiades: 57, sp. 247 [as ‘Q. (Fusconaia) utterbackii’].
Type(s): HOLOTYPE (ORIG. DESIG.) MCZ_271448, White R., Hollister, Taney Co., Missouri.

Psoronaias kuxensis Frierson, 1917
Frierson, 1917, Nautilus 31: 48, pl. 7, figs. 1-2.
Frierson, 1927, Check List N. Amer. Naiades: 64, sp. 282.
Type(s): LECTOTYPE ANSP_117094, Kux Creek, Chama, Guatemala.

Psoronaias plexoideus Frierson, 1927
‘Lea’ Sowerby, 1868, Conch. Icon. 16: pl. 64, sp. 324; errata [as ‘Unio rusticus’].
Frierson, 1927, Check List N. Amer. Naiades: 63, sp. 273.

Unio petrinus Frierson, 1927
‘Call (Mss)’ Frierson, 1927, Check List N. Amer. Naiades: 49.
(intro'd as syn of Unio aureus Lea, 1859)

Lampsilis (Disconaias) novileonensis Frierson, 1927
‘Pilsbry’ Frierson, 1927, Check List N. Amer. Naiades: 83 [as ‘novi-leonensis’].
(error for Lampsilis novileonis Pilsbry, 1910)

Lampsilis (Actinonaias) meddellina Frierson, 1927
‘Lea’ Frierson, 1927, Check List N. Amer. Naiades: 84.
(error for Unio medellinus Lea, 1838)

Pleurobema (s.s.) fictum Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 43, sp. 195.
Frierson, 1928, Nautilus 41(4): 139, pl. 3, figs. 2-2a.
Type(s): HOLOTYPE UMMZ_80791, Cahaba River, Alabama.

Pleurobema (s.s.) marshalli Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 43, sp. 196.
Frierson, 1928, Nautilus 41(4): 139, pl. 3, fig. 3.
Type(s): FIGURED SYNTYPE UMMZ_80859, Tombigbee River, Boligee, Greene Co., Alabama.

Pleurobema (s.s.) aldrichi Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 44, sp. 197.
Frierson, 1928, Nautilus 41(4): 139, pl. 3, fig. 1.
Type(s): LECTOTYPE ANSP_145246, Selma, Ala.

Lampsilis propia Frierson, 1927
‘Lea’ Frierson, 1927, Check List N. Amer. Naiades: 75.
(error for Unio proprius Lea, 1865)

Elliptio rugolosus Frierson, 1927
‘Küster’ Frierson, 1927, Check List N. Amer. Naiades: 35.
(error for Unio rugulosus Küster, 1856)

Unio ridellii Frierson, 1927
‘Lea’ of Authors.
Frierson, 1927, Check List N. Amer. Naiades: 54.
Haas, 1969, Das Tierreich 88: 300.
Pfeiffer et al., 2016, Conserv. Genet. 17(2): [3].
(error for Unio riddellii Lea, 1861)

Unio calamitarum var. prolongus Frierson, 1927
‘C. & F.’ Frierson, 1927, Check List N. Amer. Naiades: 36.
(error for Unio calamitarum var. B prolongata Fischer & Crosse, 1894)

Elliptio (Nephronaias) guatemalensis Frierson, 1927
‘von Martens’ Frierson, 1927, Check List N. Amer. Naiades: 36.
(error for Unio (Elliptio) guatemalanus Martens, 1900)

Obliquaria reflexa conradi Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 65, sp. 290a.
(intro'd as intra-sp. of Obliquaria (Quadrula) reflexa Rafinesque, 1820)
Type(s): LECTOTYPE ANSP_56695, Alabama R., Ala.

Elliptio tetralasmus manubius Frierson, 1927
‘Gould’ Frierson, 1927, Check List N. Amer. Naiades: 34.
(misidentified reference to Unio manubius Gould, 1855)

Lampsilis (Disconaias) martensi Frierson, 1927
‘Philippi’ Martens, 1900, Biol. Centr.-Amer., Moll.: pl. 37, figs. 1-1a [as ‘Unio aztecorum’].
Frierson, 1927, Check List N. Amer. Naiades: 83, sp. 364.

Anodontites schombergianus Frierson, 1927
‘Sowerby’ of Authors.
Frierson, 1927, Check List N. Amer. Naiades: 97.
Martinez et al., 2004, Mem. Fund. La Salle Cienc. Nat. 159-160: 294.
Lasso et al., 2009, Biota Colombiana 10(1-2): 72.
(error for Anodon schomburgianus Sowerby, 1870)

Elliptio (Nephronaias) sajensis Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 37, sp. 139.
Frierson, 1928, Nautilus 41(4): 139, pl. 2, fig. 2.
Type(s): SYNTYPE UMMZ_108010, Rio Saja, 5 mi W Esmeralda, Guatemala.

Elliptio (Nephritica) haricotti Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 38, sp. 150.
Frierson, 1928, Nautilus 41(4): 139, pl. 3, fig. 4.
Type(s): SYNTYPE UMMZ_97047, Guatemala.

Parreysia robsoni Frierson, 1927
‘Lea’ Sowerby, 1866, Conch. Icon. 16: pl. 36, sp. 198 [as ‘Unio pumilus’].
Frierson, 1927, Check List N. Amer. Naiades: 45.
(new name for Unio pumilus Sowerby, 1866)
Type(s): HOLOTYPE BMNH_1965150, Loc._ ?

Pleurobema (Plethobasus) cicatricoideum Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 45, sp. 203.
(error for Unio cicatricoides Frierson, 1911)

Quadrula (Fusconia [sic] beadleana Frierson, 1927
‘Lea’ of Authors.
Frierson, 1927, Check List N. Amer. Naiades: 57.
Vidrine, 1993, Histr. Distr. Freshw. Mussels LA: 63 [as ‘Pleurobema beadleanum’].
Burdick & White, 2007, J. Moll. Studies 73: 370 [as ‘Pleurobema beadleanum’].
Haag, 2012, N. Amer. Freshw. Mussels: 71 [as ‘Pleurobema beadleanum’].
(error for Unio beadleianus Lea, 1861)

Quadrula (Quincuncina) vittata Frierson, 1927
‘Lamarck’ Reeve, 1865, Conch. Icon. 16: pl. 23, sp. 106 [as ‘Unio rotundatus’].
Frierson, 1927, Check List N. Amer. Naiades: 50, sp. 218.

Lampsilis (Ligumia) streckeri Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 74, sp. 321.
Frierson, 1928, Nautilus 41(4): 139, pl. 2, fig. 1.
Type(s): HOLOTYPE UMMZ_91075, Little Red R., Arkansas.

Strophitus undulatus tennesseensis Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 22, sp. 37d.
(intro'd as intra-sp. of Anodonta undulata Say, 1817)
Type(s): LECTOTYPE MCZ_16690, Duck River, Shelbyville, Rockford, Co., Tennessee.

Strophitus undulatus ovatus Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 22, sp. 37e.
R.I. Johnson, 1972, Occ. Pap. Moll. 3(41): 147, pl. 22, fig. 2.
(intro'd as intra-sp. of Anodonta undulata Say, 1817)
Type(s): LECTOTYPE UMMZ_113533, Edwards River, Illinois.

Lampsilis (Disconaias) pilsbryana Frierson, 1927
‘Say’ Frierson, 1912, Nautilus 26(2): pl. 3, fig. 4 [as ‘Lampsilis purpuriatus’].
Frierson, 1927, Check List N. Amer. Naiades: 83, sp. 368.
Type(s): HOLOTYPE UMMZ_91175, Valles River, Mecos, Mexico.

Quadrula (Fusconaia) flava sampsoniana Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 55, sp. 235d.
(intro'd as intra-sp. of Obliquaria (Quadrula) flava Rafinesque, 1820)
Type(s): LECTOTYPE UMMZ_92226, Elk River, Missouri.

Elliptio cylindraceus Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 29, sp. 87.
(new name for Unio lugubris Lea, 1838)

Lampsilis (Ligumia) nervosa Frierson, 1927
‘Rafinesque’ of Authors.
Frierson, 1927, Check List N. Amer. Naiades: 77, sp. 336.
Haas, 1969, Das Tierreich 88: 445.
(misidentified reference to Unio (Leptodea) nervosa Rafinesque, 1820)

Quadrula (Cyclonaias) tuberculata utterbackiana Frierson, 1927
‘Lea’ Utterback, 1915, Amer. Midl. Nat. 4(5): 183, pl. 20, fig. 57a-b [as ‘Plethobasus cooperianus’].
Frierson, 1927, Check List N. Amer. Naiades: 52, sp. 224c.
(intro'd as intra-sp. of Obliquaria (Rotundaria) tuberculata Rafinesque, 1820)

Psoronaias martensi Frierson, 1927
Martens, 1900, Biol. Centr.-Amer., Moll.: 494, pl. 31, figs. 1-2 [as ‘Unio psoricus’].
Frierson, 1927, Check List N. Amer. Naiades: 64, sp. 279.

Unio planilateralis Frierson, 1927
‘Conrad’ of Authors.
Frierson, 1927, Check List N. Amer. Naiades: 31.
Haas, 1969, Das Tierreich 88: 233.
(error for Unio planilateris Conrad, 1838)

Glabaris glabrus Frierson, 1927
‘Simpson’ Frierson, 1927, Check List N. Amer. Naiades: 13.
(intro'd as syn of Anodonta impura Say, 1829)

Lampsilis (s.s.) sowerbyana Frierson, 1927
‘Lea’ Sowerby, 1868, Conch. Icon. 16: pl. 63, sp. 316 [as ‘Unio pictus’].
Frierson, 1927, Check List N. Amer. Naiades: 69, sp. 308.

Lampsilis (s.s.) rafinesqueana Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 69, sp. 309.
Frierson, 1928, Nautilus 41(4): 138, pl. 1, figs. 1-2.
Type(s): SYNTYPES UMMZ_91176, Indian Creek, McDonald Co., McDonald.

Lampsilis (Cyrtonaias) tampicoensis kusteriana Frierson, 1927
‘Lea’ Küster, 1862, Conchyl. Cab. 9(2): 275, pl. 93, fig. 1 [as ‘Unio tampicoënsis’].
Frierson, 1927, Check List N. Amer. Naiades: 85, sp. 383d.
(intro'd as intra-sp. of Unio tampicoensis Lea, 1838)

Unio virginea Frierson, 1927
‘Lamarck’ Frierson, 1927, Check List N. Amer. Naiades: 72.
(error for Unio virginana Reeve, 1865)

Unio mytilloides Frierson, 1927
‘Swainson’ Frierson, 1927, Check List N. Amer. Naiades: 91.
(error for Unio (s.s.) mytiloides Swainson, 1840; misidentified reference to Unio (s.s.) mytiloides Swainson, 1840)

Quadrula (Pleuronaia) analogia Frierson, 1927
‘Ortmann’ Frierson, 1927, Check List N. Amer. Naiades: 60, sp. 261.
(error for Fusconaia cor var. analoga Ortmann, 1918)

Lampsilis (Villosa) wrightiana Frierson, 1927
Frierson, 1927, Check List N. Amer. Naiades: 81, sp. 351.
Frierson, 1928, Nautilus 41(4): 139, pl. 2, fig. 3.
Type(s): SYNTYPE UMMZ_91179, Volusia Co., Fla.

Unio mytilloides Frierson, 1927
‘Lea, 1829’ Frierson, 1927, Check List N. Amer. Naiades: 52.
(misidentified reference to Pleurobema mytiloides Rafinesque, 1820; error for Pleurobema mytiloides Rafinesque, 1820)

Lampsilis arkansensis Frierson, 1927
‘Lea’ Frierson, 1927, Check List N. Amer. Naiades: 81, sp. 355.
(error for Unio arkansasensis Lea, 1862)

Alasmidonta (Bullella) arcula (Lea, 1838)

Alasmidonta (Pressodonta) calceola (Lea, 1828)
+ Alasmodonta truncata Conrad, 1834
+ Alasmidonta marginata Say, 1834
+ Margaritana deltoidea Lea, 1838

Alasmidonta (Pressodonta) calceola-minor (Lea, 1845)

Alasmidonta (Prolasmidonta) heterodon (Lea, 1829)

Alasmidonta (Sulcularia) badia (Rafinesque, 1831)
+ Margaritana holstonia Lea, 1838
+ Margaritana etowaensis Conrad, 1849
+ Margaritana etowahensis Lea, 1858
+ Margaritana georgiana Lea, 1859
+ Alasmodonta impressa J.G. Anthony, 1865
+ Unio holstonianus Sowerby, 1868

Alasmidonta (Sulcularia) diversa (Conrad, 1856)

Alasmidonta (s.s.) triangulata (Lea, 1858)

Alasmidonta (s.s.) undulata (Say, 1817)
+ Unio hians Valenciennes, 1827
+ Alasmodonta sculptilis Say, 1829

Alasmidonta (s.s.) undulata-mytiloides (Swainson, 1840)
+ Uniopsis radiata Swainson, 1840
+ Unio swainsoni Sowerby, 1868

Amblema (Megalonaias) gigantea (Barnes, 1823)
+ Unio undulatus Barnes, 1823
+ Unio heros Say, 1829
+ Unio multiplicatus Lea, 1831
+ Unio eightsii Lea, 1860
+ Unio atrocostatus Reeve, 1864

Amblema (Megalonaias) gigantea-boykiniana (Lea, 1840)

Amblema (Megalonaias) nickliniana (Lea, 1834)

Amblema (Megalonaias) nickliniana-digitata (Morelet, 1851)
+ Unio (Crenodonta) stolli Martens, 1900

Amblema (Megalonaias) triumphans (Wright, B.H., 1898)

Amblema (Plectomerus) dombeyana (Valenciennes, 1827)
+ Unio crassidens Lamarck, 1819
+ Bariosta ponderosus Rafinesque, 1831
+ Unio interruptus Say, 1831
+ Unio trapezoides Lea, 1831
+ Quadrula trapezoides var. pentagonoides Frierson, 1902

Amblema (s.s.) plicata (Say, 1819)
+ Unio rariplicata Lamarck, 1819
+ Unio peruviana Lamarck, 1819
+ Unio heros Küster, 1855

Amblema (s.s.) plicata-costata Rafinesque, 1820
+ Unio latecostatus Lea, 1845
+ Unio atrocostatus Sowerby, 1868

Amblema (s.s.) plicata-elliottii (Lea, 1856)

Amblema (s.s.) plicata-hippopaea [sic] Lea, 1845

Amblema (s.s.) plicata-neisleri (Lea, 1858)

Amblema (s.s.) plicata-perplicata (Conrad, 1841)
+ Unio atrocostatus Lea, 1845
+ Unio pearlensis Conrad, 1855
+ Unio perlensis Reeve, 1864
+ Unio brazosensis Lea, 1868
+ Unio lincecumii Lea, 1868
+ Unio pauciplicatus Lea, 1872

Amblema (s.s.) plicata-pilsbryi (Marsh, 1891)

Amblema (s.s.) plicata-quintardi (Cragin, 1887)

Amblema (s.s.) plicata-southalli (Marshall, 1916)

Anodonta (Anodontoides) birgei (Baker, F.C., 1923)

Anodonta (Anodontoides) ferussaciana Lea, 1834
+ Anodonta buchanensis Lea, 1838
+ Anodonta ferruginea Lea, 1840
+ Anodonta argentea Lea, 1840
+ Anodon plicatus Haldeman, 1842
+ Anodonta denigrata Lea, 1852
+ Anodonta oblita Lea, 1852
+ Anodonta simpsoniana Lea, 1861

Anodonta (Anodontoides) ferussaciana-subcylindracea Lea, 1838

Anodonta (Anodontoides) modesta Lea, 1857

Anodonta (Arnoldina) dejecta Lewis, 1875
+ Anodonta mearnsiana Simpson, 1893

Anodonta (Lastena) couperiana Lea, 1840
+ Anodonta cowperiana Lea, 1840

Anodonta (Lastena) couperiana-dunlapiana Lea, 1842

Anodonta (Lastena) ohiensis Rafinesque, 1820

Anodonta (Lastena) ohiensis Rafinesque, 1820
+ Anodonta imbecillis Say, 1829
+ Anodonta incerta Lea, 1834
+ Anodonta henryana Lea, 1857

Anodonta (Lastena) ohiensis-horda Gould, 1855
+ Anodon hordeum Sowerby, 1867

Anodonta (Pyganodon) cataracta Say, 1817
+ Anodonta fluviatilis Bosc, 1801
+ Anodonta (s.s.) atra Rafinesque, 1820
+ Anodonta teres Conrad, 1834
+ Anodonta virgulata Lea, 1857
+ Anodonta williamsii Lea, 1862
+ Anodonta tryonii Lea, 1862
+ Anodonta dolearis Lea, 1863
+ Anodonta doliaris Lea, 1863

Anodonta (Pyganodon) cataracta-gibbosa Say, 1825
+ Anodonta dariensis Lea, 1858

Anodonta (Pyganodon) cataracta-hallenbeckii Lea, 1858
+ Anodonta gesnerii Lea, 1858

Anodonta (Pyganodon) grandis Say, 1829
+ Anodonta inflata Rafinesque, 1831
+ Anodonta corpulenta Cooper, 1834
+ Anodonta stewartiana Lea, 1834
+ Anodonta gigantea Lea, 1838
+ Anodonta virens Lea, 1852
+ Anodonta linnaeana Lea, 1852
+ Anodonta opaca Lea, 1852

Anodonta (Pyganodon) grandis-bealei Lea, 1863

Anodonta (Pyganodon) grandis-benedictensis (Lea, 1834)
+ Margaron (Anodonta) benedictii Lea, 1870

Anodonta (Pyganodon) grandis-dakota Frierson, 1910

Anodonta (Pyganodon) grandis-dakotana Utterback, 1915

Anodonta (Pyganodon) grandis-globosa Lea, 1841
+ Anodon nopalatensis Sowerby, 1867

Anodonta (Pyganodon) grandis-grijalvae Morelet, 1884

Anodonta (Pyganodon) grandis-lugubris Say, 1829
+ Anodonta plana Lea, 1834
+ Anodonta declivis Conrad, 1834
+ Anodonta decora Lea, 1838
+ Anodonta ovata Lea, 1838
+ Anodonta salmonia Lea, 1838
+ Anodonta footiana Lea, 1840
+ Anodonta maryattana Lea, 1840
+ Anodonta harpethensis Lea, 1840
+ Anodonta lewisii Lea, 1857
+ Anodonta danielsii Lea, 1858
+ Anodonta texasensis Lea, 1859
+ Anodonta leonensis Lea, 1862
+ Anodon subangulata J.G. Anthony, 1865
+ Anodon subinflata J.G. Anthony, 1865
+ Anodon imbricata J.G. Anthony, 1865
+ Anodon micans J.G. Anthony, 1865
+ Anodon subgibbosa J.G. Anthony, 1866
+ Anodon mcnielii J.G. Anthony, 1866

Anodonta (Pyganodon) grandis-pepiniana Lea, 1838
+ Anodonta kennicottii Lea, 1861
+ Anodonta dallasiana Lea, 1863
+ Anodon opalina J.G. Anthony, 1865
+ Anodonta houghtonensis DeCamp, 1881

Anodonta (Pyganodon) grandis-tabascensis Morelet, 1884
+ Anodonta tabascoensis Simpson, 1900

Anodonta (Pyganodon) implicata Say, 1829
+ Anodonta newtonensis Lea, 1838
+ Anodonta excurvata De Kay, 1843
+ Anodonta housatonica Gould, 1848

Anodonta (Utterbackiana) suborbiculata Say, 1831

Anodonta (s.s.) beringiana Middendorff, 1851
+ Anodonta youkanensis Lea, 1867
+ Anodonta youconensis Lea, 1867

Anodonta (s.s.) californiensis Lea, 1852

Anodonta (s.s.) impura Say, 1829
+ Unio (Anodonta) coarctata Anton, 1839
+ Anodon glabrus Sowerby, 1870
+ Anodonta exilior Lea, 1871
+ Anodonta viridana Clessin, 1876
+ Anodonta chalcoensis Crosse & Fischer, 1893
+ Anodonta chapalensis Crosse & Fischer, 1893
+ Glabaris glabrus Frierson, 1927

Anodonta (s.s.) kennerlyi Lea, 1860

Anodonta (s.s.) lurulenta Morelet, 1849

Anodonta (s.s.) marginata Say, 1817
+ Anodonta fragilis Lamarck, 1819
+ Anodonta lacustris Lea, 1857
+ Anodon flava J.G. Anthony, 1865
+ Anodon glandulosa J.G. Anthony, 1865
+ Anodon pallida J.G. Anthony, 1865
+ Anodon irisans J.G. Anthony, 1865
+ Anodonta subcarinata Currier, 1867
+ Anodon subcylindracea Sowerby, 1867
+ Anodon pholadiformis Sowerby, 1870
+ Anodon exilis Sowerby, 1870

Anodonta (s.s.) oregonensis Lea, 1838
+ Anodon cognata Gould, 1850

Anodonta (s.s.) richardsoni Martens, 1900

Anodonta (s.s.) wahlamatensis Lea, 1838
+ Anodonta nuttalliana Lea, 1838
+ Anodonta rotundovata Trask, 1854
+ Anodonta triangularis Trask, 1854
+ Anodon rostratus Sowerby, 1867
+ Anodonta laosensis Fischer, 1891
+ Anodonta nuttalliana var. idahoensis Hemphill, 1891
+ Anodonta wahlametensis Simpson, 1900

Anodontites cylindracea (Lea, 1838)
+ Anodon bambousearum Morelet, 1851
+ Anodonta strebelii Lea, 1868

Anodontites depexa (von Martens, 1900)

Anodontites jaliscoensis (Pilsbry, 1920)

Anodontites montezuma (Lea, 1841)
+ Anodonta inaequivalva Lea, 1868
+ Anodonta lenticularis Lea, 1868
+ Anodon montezianus Sowerby, 1870

Anodontites tehuantepecensis (Crosse & Fischer, 1894)

Anodontites tortilis (Lea, 1852)
+ Anodonta luteola Lea, 1858
+ Anodon schomburgianus Sowerby, 1870

Arcidens confragosa (Say, 1829)

Arkansia wheeleri Ortmann & Walker, 1912

Arotonaias cyrenoides (Philippi, 1847)
+ Unio newcombianus Lea, 1856
+ Unio sagrinatus Sowerby, 1868
+ Unio gabbianus Martens, 1900

Arotonaias gabbiana (Lea, 1868)
+ Unio nicaraguensis Lea, 1868

Arotonaias imbricata (Mörch, 1861)
+ Unio encarpus Lea, 1868

Canthyria collina (Conrad, 1836)

Canthyria spinosa (Lea, 1838)

Carunculina glans (Lea, 1831)
+ Toxolasma lividus Rafinesque, 1831
+ Unio moestus Lea, 1841
+ Unio maestus Lea, 1842

Carunculina glans-corvuncula (Lea, 1868)
+ Unio pullus Conrad, 1838

Carunculina glans-cylindrella (Lea, 1868)

Carunculina minor (Lea, 1843)

Carunculina parva (Barnes, 1823)

Carunculina parva-compressa (Simpson, 1900)

Carunculina parva-haleiana (Lea, 1843)

Carunculina parva-mearnsi (Simpson, 1900)

Carunculina parva-texasensis (Lea, 1857)
+ Unio bairdianus Lea, 1857
+ Unio bealei Lea, 1862

Carunculina paula (Lea, 1840)
+ Unio germanus Lea, 1861
+ Unio cromwellii Lea, 1865
+ Unio marginis Lea, 1865

Cumberlandia monodonta (Say, 1829)
+ Unio soleniformis Lea, 1831

Cyprogenia aberti (Conrad, 1850)
+ Unio lamarckianus Lea, 1852
+ Unio popenoi Call, 1885

Cyprogenia stegaria (Rafinesque, 1820)
+ Unio verrucosus albus Hildreth, 1828
+ Unio irroratus Lea, 1828

Cyprogenia stegaria-pusilla Simpson, 1900

Decurambis marginata (Say, 1818)
+ Decurambis scriptum Rafinesque, 1831
+ Alasmodonta truncata Lea, 1836
+ Alasmodon corrugata De Kay, 1843
+ Alasmidonta (Decurambis) marginata susquehannae Ortmann, 1919

Decurambis marginata-atropurpureum Rafinesque, 1831
+ Margaritana raveneliana Lea, 1834
+ Unio swananoensis Hanley, 1843

Decurambis marginata-varicosa (Lamarck, 1819)
+ Alasmodon marginata De Kay, 1843

Diplasma vitrea Rafinesque
+ Unio olivarius Lea, 1831

Dromus dromas (Lea, 1834)

Dromus dromas-caperatus (Lea, 1845)
+ Unio abacoides Haldeman, 1846

Dysnomia (Capsaeformis) capsaeformis (Lea, 1834)

Dysnomia (Capsaeformis) florentina (Lea, 1857)
+ Unio saccatus Küster, 1862
+ Unio sacculus Reeve, 1864

Dysnomia (Capsaeformis) florentina-curtisi (Utterback, 1915)

Dysnomia (Capsaeformis) lefevrei (Utterback, 1915)

Dysnomia (Capsaeformis) turgidula (Lea, 1858)
+ Unio deviatus Reeve, 1864

Dysnomia (Capsaeformis) walkeri (Wilson & Clark, 1914)

Dysnomia (Penita) arcaeformis (Lea, 1831)
+ Unio nexus Say, 1831
+ Truncilla metaplata Rafinesque, 1831

Dysnomia (Penita) brevidens (Lea, 1831)
+ Unio interruptus Conrad, 1834

Dysnomia (Penita) haysiana (Lea, 1834)
+ Unio sowerbianus Lea, 1834

Dysnomia (Penita) lenior (Lea, 1840)
+ Unio lenis Lea, 1840

Dysnomia (Penita) metastriatus (Conrad, 1838)
+ Unio compactus Lea, 1859

Dysnomia (Penita) modicella (Lea, 1859)

Dysnomia (Penita) othcaloogensis (Lea, 1857)

Dysnomia (Penita) penita (Conrad, 1834)

Dysnomia (Pilea) personata (Say, 1829)
+ Unio pileus Lea, 1831
+ Unio capillaris Lea, 1834

Dysnomia (Pilea) sulcata (Lea, 1829)
+ Unio ridibundus Say, 1829
+ Unio obliquatus Say, 1834
+ Unio gibbosus var. perobliquus Conrad, 1836

Dysnomia (Pilea) sulcata-pectita (Conrad, 1853)
+ Truncilla (Scalenaria) sulcata var. delicata Simpson, 1900

Dysnomia (Torulosa) biemarginata (Lea, 1857)

Dysnomia (Torulosa) propinqua (Lea, 1857)

Dysnomia (Torulosa) rangiana (Lea, 1838)

Dysnomia (Torulosa) sampsonii (Lea, 1862)

Dysnomia (Torulosa) torulosa (Rafinesque, 1820)
+ Unio cornutus of Authors, unknown year
+ Amblema gibbosa Rafinesque, 1820
+ Unio perplexus Lea, 1831
+ Unio obliquus Potiez & Michaud, 1844

Dysnomia (Torulosa) torulosa-cincinnatiensis (Lea, 1840)

Dysnomia (Torulosa) torulosa-gubernaculum (Reeve, 1856)

Dysnomia (Truncillopsis) triquetra (Rafinesque, 1820)
+ Unio triangularis Barnes, 1823
+ Unio cuneatus Swainson, 1823
+ Unio formosus Lea, 1831

Dysnomia (s.s.) flexuosa (Rafinesque, 1820)
+ Unio cornutus of Authors, unknown year
+ Unio foliatus Hildreth, 1828

Dysnomia (s.s.) lewisi (Walker, 1910)

Dysnomia (s.s.) stewardsoni (Lea, 1852)

Elliptio (Barynaias) averyi (Lea, 1859)
+ Unio caldwellii Lea, 1858

Elliptio (Barynaias) opacatus (Crosse & Fischer, 1893)

Elliptio (Barynaias) pigerrimus (Crosse & Fischer, 1893)

Elliptio (Barynaias) sallei (Crosse & Fischer, 1893)

Elliptio (Barynaias) sallei-grossus (von Martens, 1900)

Elliptio (Barynaias) tamaulipasensis (Conrad, 1855) [sic]
+ Unio taumilapanus Conrad, 1855
+ Unio mitchelli Dall, 1895
+ Unio iheringi B.H. Wright, 1898

Elliptio (Barynaias) tamaulipasensis-elongatus (Simpson, 1914)

Elliptio (Elliptoideus) sloatianus (Lea, 1840)
+ Unio atromarginatus Lea, 1840
+ Unio aratus Conrad, 1849
+ Unio plectophorus Conrad, 1849
+ Margaron (Unio) plectoforus Lea, 1852

Elliptio (Eurynaia [sic]) dilatatus (Rafinesque, 1820)
+ Unio nasuta Lamarck, 1819
+ Unio gibbosus Barnes, 1823
+ Obliquaria bicolor Rafinesque, 1831
+ Obliquaria violacea Rafinesque, 1831
+ Unio arctatus Ferussac, 1835
+ Unio arctior Lea, 1838
+ Unio stonensis Lea, 1840
+ Unio lazarus Sowerby, 1868

Elliptio (Eurynaia [sic]) dilatatus-arcus (Conrad, 1834)

Elliptio (Eurynaia [sic]) dilatatus-armathwaitensis (Wright, B.H., 1898)

Elliptio (Eurynaia [sic]) dilatatus-delicatus (Simpson, 1900)

Elliptio (Eurynaia [sic]) dilatatus-fulvus (Rafinesque, 1831)
+ Unio luridus Lea, 1852
+ Unio rufus Lea, 1857
+ Unio subgibbosus Lea, 1857

Elliptio (Martensnaias) rubicundus (von Martens, 1900)

Elliptio (Micronaias) aratus (Lea, 1843)

Elliptio (Micronaias) fallaciosus (Simpson, 1914)

Elliptio (Micronaias) granadensis (Lea, 1868)
+ Unio aratus Martens, 1900

Elliptio (Nephritica) haricotti Frierson, 1927

Elliptio (Nephritica) poeyanus (Lea, 1857)

Elliptio (Nephronaias) aeruginosus (Morelet, 1849)
+ Unio macnielii Lea, 1869

Elliptio (Nephronaias) calamitarum (Morelet, 1849)

Elliptio (Nephronaias) calamitarum-prolongus [sic] (Crosse & Fischer, 1893)

Elliptio (Nephronaias) championi (von Martens, 1900)

Elliptio (Nephronaias) copanensis (von Martens, 1900)

Elliptio (Nephronaias) dysoni (Lea, 1859)
+ Unio calamitarum var. G arcuans Fischer & Crosse, 1894

Elliptio (Nephronaias) goascoranensis (Lea, 1858)

Elliptio (Nephronaias) guatemalensis [sic] (Martens, 1900)
+ Unio goascoranensis Martens, 1900

Elliptio (Nephronaias) hjalmarsoni (Dunker, 1858)

Elliptio (Nephronaias) melleus (Lea, 1859)

Elliptio (Nephronaias) oregonensis (Lea, 1852)
+ Unio (Elliptio) radiatulus Martens, 1900

Elliptio (Nephronaias) persulcatus (Lea, 1859)

Elliptio (Nephronaias) plicatulus (Charpentier in Küster, 1856)

Elliptio (Nephronaias) ravistellus (Morelet, 1849)

Elliptio (Nephronaias) ravistellus-vellicatus (Sowerby, 1865)

Elliptio (Nephronaias) ravistellus-yzabalensis (Crosse & Fischer, 1892)

Elliptio (Nephronaias) rowellii (Lea, 1859)

Elliptio (Nephronaias) rugolosus [sic] (Charpentier in Küster, 1856)

Elliptio (Nephronaias) sajensis (Frierson, 1927)

Elliptio (Nephronaias) scamnatus (Morelet, 1849)
+ Unio gundlachi Sowerby, 1866
+ Unio (Simonaias) proclinatus Martens, 1900

Elliptio (Nephronaias) sphenorhynchus (Crosse & Fischer, 1893)
+ Unio (Nephronaias) ortmanni Frierson, 1913

Elliptio (Nephronaias) subventralis (von Martens, 1900)

Elliptio (Nephronaias) tabascoensis (Charpentier in Küster, 1856)

Elliptio (Pachynaias) rugososulcatus (Lea, 1866)

Elliptio (Pachynaias) spheniopsis (Crosse & Fischer, 1893) [sic]

Elliptio (Popenaias) metallicus (Say, 1831)
+ Unio cuprinus Lea, 1831
+ Unio aereus Reeve, 1865

Elliptio (Popenaias) metallicus-ganinus (Pilsbry, 1909)

Elliptio (Popenaias) popei (Lea, 1857)
+ Unio veraepacis Tristram, 1863

Elliptio (Reticulatus) reticulatus (Simpson, 1900)

Elliptio (Sphenonaias) callosus (Lea, 1841)
+ Unio tehuantepecensis Crosse & Fischer, 1894

Elliptio (Sphenonaias) coloratus (Charpentier, 1856)

Elliptio (Sphenonaias) flucki (Bartsch, 1906)

Elliptio (Sphenonaias) liebmanni (Philippi, 1847)

Elliptio (Sphenonaias) liebmanni-cuatotolapamensis Baker, H.B., 1922

Elliptio (Sphenonaias) mexicanus (Philippi, 1847)

Elliptio (Sphenonaias) microdon (von Martens, 1887)

Elliptio (Uniomerus) bissellianus [sic] (Lea, 1867)

Elliptio (Uniomerus) declivis (Say, 1831)
+ Unio geometricus Lea, 1834

Elliptio (Uniomerus) dispalans (Wright, B.H., 1899)

Elliptio (Uniomerus) obesus (Lea, 1831)
+ Unio caroliniana Bosc, 1801
+ Unio ineptus Lea, 1852
+ Unio hebes Lea, 1852
+ Unio rivularis Conrad, 1853
+ Unio cicur Lea, 1861
+ Unio squalidus Lea, 1863
+ Unio jewettii Lea, 1867
+ Unio rivicolus Conrad, 1868
+ Unio pawensis Lea, 1868

Elliptio (Uniomerus) obesus-blandingianus (Lea, 1834)
+ Unio paludicolor Conrad, 1853

Elliptio (Uniomerus) obesus-paludicolus (Lea, 1834)

Elliptio (Uniomerus) tetralasmus (Say, 1831)
+ Unio declivis Conrad, 1836
+ Unio excultus Conrad, 1838
+ Unio parallelus Conrad, 1841
+ Unio symmetricus Lea, 1845
+ Unio porrectus Conrad, 1854
+ Unio subcroceus Conrad, 1854
+ Unio jamesianus Lea, 1857

Elliptio (Uniomerus) tetralasmus-camptodon (Say, 1832)

Elliptio (Uniomerus) tetralasmus-columbensis (Lea, 1857)

Elliptio (Uniomerus) tetralasmus-manubius (Gould, 1855)

Elliptio (Uniomerus) tetralasmus-sayi (Ward, 1839)
+ Unio sayanus Conrad, 1838
+ Unio electrinus Reeve, 1865

Elliptio (s.s.) aheneus (Lea, 1841)

Elliptio (s.s.) aheneus-oscari (Wright, B.H., 1892)

Elliptio (s.s.) angustatus (Lea, 1831)
+ Unio extensus Lea, 1857

Elliptio (s.s.) anthonyi (Lea, 1861)

Elliptio (s.s.) aquilus (Lea, 1857)

Elliptio (s.s.) arctatus (Conrad, 1834)
+ Unio strigosus Lea, 1840
+ Unio lazarus Lea, 1852
+ Unio viridans Lea, 1859
+ Unio mercerii Lea, 1862

Elliptio (s.s.) buckleyi (Lea, 1841)

Elliptio (s.s.) buddianus (Lea, 1843)
+ Unio websterii B.H. Wright, 1888
+ Unio buckleyi Simpson, 1900

Elliptio (s.s.) buddianus-dalli (Wright, B.H., 1888)

Elliptio (s.s.) buddianus-hartwrightii (Wright, B.H., 1896)

Elliptio (s.s.) buddianus-monroensis (Lea, 1843)

Elliptio (s.s.) buddianus-orcuttii (Wright, S.H., 1888)

Elliptio (s.s.) buddianus-pinei (Wright, B.H., 1897)

Elliptio (s.s.) buxtoni (Wright, B.H., 1897)

Elliptio (s.s.) chipolaensis (Walker, 1905)

Elliptio (s.s.) complanatus (Dillwyn, 1817)
+ Unio violaceus Spengler, 1793
+ Unio purpureus Say, 1817
+ Unio carinifera Lamarck, 1819
+ Unio coarctata Lamarck, 1819
+ Unio georgina Lamarck, 1819
+ Unio glabrata Lamarck, 1819
+ Unio purpurascens Lamarck, 1819
+ Unio rarisulcata Lamarck, 1819
+ Unio rhombula Lamarck, 1819
+ Unio sulcidens Lamarck, 1819
+ Unio virginiana Lamarck, 1819
+ Unio (Elliptio) aurata Rafinesque, 1820
+ Unio fluviatilis Green, 1827
+ Unio rigidus Wood, 1828
+ Unio griffithianus Lea, 1834
+ Unio planilateris Conrad, 1838
+ Unio fuliginosus Lea, 1845
+ Unio sordidus Lea, 1852
+ Unio vicinus Lea, 1856
+ Unio abbevillensis Lea, 1857
+ Unio fumatus Lea, 1857
+ Unio macer Lea, 1857
+ Unio savannahensis Lea, 1857
+ Unio subflavus Lea, 1857
+ Unio sublatus Lea, 1857
+ Unio virens Lea, 1857
+ Unio exactus Lea, 1858
+ Unio neusensis Lea, 1858
+ Unio postellii Lea, 1858
+ Unio purus Lea, 1858
+ Unio roswellensis Lea, 1858
+ Unio baldwinensis Lea, 1859
+ Unio inusitatis Lea, 1859
+ Unio latus Lea, 1859
+ Unio quadratus Lea, 1859
+ Unio raeensis Lea, 1859
+ Unio salebrosus Lea, 1859
+ Unio viridiradiatus Lea, 1859
+ Unio decumbens Lea, 1861
+ Unio lugubris Küster, 1861
+ Unio squameus Lea, 1861
+ Unio aberrans Lea, 1863
+ Unio ablatus Lea, 1863
+ Unio chathamensis Lea, 1863
+ Unio gastonensis Lea, 1863
+ Unio mediocris Lea, 1863
+ Unio mecklenbergensis Lea, 1863
+ Unio quadrilaterus Lea, 1863
+ Unio raleighensis Lea, 1863
+ Unio weldonensis Lea, 1863
+ Unio beaverensis Lea, 1868
+ Unio humerosus Lea, 1868
+ Unio nubilus Lea, 1868
+ Unio tortuosus Sowerby, 1868
+ Unio uhareensis Lea, 1868
+ Unio amplus Lea, 1872
+ Unio basalis Lea, 1872
+ Unio differtus Lea, 1872
+ Unio dissimilis Lea, 1872
+ Unio irwinensis Lea, 1872
+ Unio ligatus Lea, 1872
+ Unio ratus Lea, 1872
+ Unio strumosus Lea, 1872
+ Unio subparallelus Lea, 1872
+ Unio yadkinensis Lea, 1872
+ Unio infuscus Lea, 1872
+ Unio cirratus Lea, 1874
+ Unio corneus Lea, 1874
+ Unio dooleyensis Lea, 1874
+ Unio gesnerii Lea, 1874
+ Unio infulgens Lea, 1874
+ Unio invenustus Lea, 1874
+ Unio subolivaceus Lea, 1874
+ Unio (Arconaia) provancheriana Pilsbry, 1890
+ Unio oblatus Simpson, 1900
+ Unio indefinitus Haas, 1969

Elliptio (s.s.) complanatus-catawbensis (Lea, 1862)
+ Unio sagittiformis Lea, 1852
+ Unio wheatleyi Lea, 1857
+ Unio rostrum Lea, 1861
+ Unio oblongus Lea, 1872
+ Unio subsquamosus Lea, 1872
+ Unio curvatus Lea, 1872

Elliptio (s.s.) complanatus-cuvierianus (Lea, 1852)

Elliptio (s.s.) complanatus-icterinus (Conrad, 1834)
+ Unio curatus Lea, 1863
+ Unio datus Lea, 1868
+ Unio cuspidatus Lea, 1872

Elliptio (s.s.) complanatus-jejunus (Lea, 1838)
+ Unio percoarctatus Lea, 1857

Elliptio (s.s.) complanatus-livingstonensis (Lea, 1863)

Elliptio (s.s.) complanatus-northamptonensis (Lea, 1862)

Elliptio (s.s.) complanatus-ocmulgeensis (Lea, 1861)

Elliptio (s.s.) complanatus-plantii (Lea, 1857)

Elliptio (s.s.) complanatus-pullatus (Lea, 1858)
+ Unio hastatus Lea, 1874

Elliptio (s.s.) complanatus-subinflatus (Conrad, 1835)
+ Unio roanokensis Lea, 1838
+ Unio hopetonensis Lea, 1838

Elliptio (s.s.) complanatus-tuomeyi (Lea, 1852)
+ Unio barrattii Lea, 1852
+ Unio hallenbeckii Lea, 1859
+ Unio verutus Lea, 1859

Elliptio (s.s.) congaraeus (Lea, 1831)
+ Unio fulvus Lea, 1834
+ Unio rufusculus Lea, 1852
+ Unio gibbesianus Lea, 1852

Elliptio (s.s.) coruscus (Gould, 1856)

Elliptio (s.s.) coruscus-fryanus (Wright, B.H., 1888)
+ Unio diazensis S.H. Wright, 1897

Elliptio (s.s.) cunninghami (Wright, B.H., 1883)

Elliptio (s.s.) cylindraceus Frierson, 1927
+ Unio lugubris Lea, 1838

Elliptio (s.s.) dariensis (Lea, 1842)

Elliptio (s.s.) dorei (Wright, B.H., 1888)

Elliptio (s.s.) dorsatus (Lea, 1868)

Elliptio (s.s.) downiei (Lea, 1858)

Elliptio (s.s.) duttonianus (Lea, 1841)

Elliptio (s.s.) emmonsii (Lea, 1857)
+ Unio subcylindraceus Lea, 1874

Elliptio (s.s.) errans (Lea, 1856)
+ Unio contractus Lea, 1857
+ Unio palliatus Ravenel, 1875
+ Unio singularis B.H. Wright, 1899

Elliptio (s.s.) ferrissii (Marsh, 1891)

Elliptio (s.s.) folliculatus (Lea, 1838)
+ Unio attenuatus Lea, 1872
+ Unio exacutus Lea, 1872
+ Unio rostellum Lea, 1872

Elliptio (s.s.) forbesianus (Lea, 1853)
+ Unio congaraeus Conrad, 1836
+ Unio moussonianus Lea, 1852

Elliptio (s.s.) fraternus (Lea, 1852)

Elliptio (s.s.) fuscatus (Lea, 1841)

Elliptio (s.s.) geddingsianus (Lea, 1840)
+ Unio limatulus Conrad, 1849
+ Unio whiteianus Lea, 1852
+ Unio protensus Lea, 1865
+ Unio radiolus Lea, 1871

Elliptio (s.s.) geminus (Lea, 1856)
+ Unio satillaensis Lea, 1858

Elliptio (s.s.) hazelhurstianus [sic] (Lea, 1858)

Elliptio (s.s.) hepaticus (Lea, 1859)

Elliptio (s.s.) hinkleyi (Wright, B.H., 1888)

Elliptio (s.s.) insulsus (Lea, 1857)
+ Unio cistellaeformis Lea, 1863

Elliptio (s.s.) jayensis (Lea, 1838)
+ Unio prasinatus Conrad, 1866
+ Margaron (Unio) jayanus Lea, 1870
+ Unio simpsoni B.H. Wright, 1888

Elliptio (s.s.) jayensis-tryoni (Wright, B.H., 1888)

Elliptio (s.s.) lanceolatus (Lea, 1828)

Elliptio (s.s.) lecontianus (Lea, 1838)
+ Unio contrarius Conrad, 1849

Elliptio (s.s.) lehmani (Wright, S.H., 1897)
+ Unio fuscatus Reeve, 1865
+ Unio burtchianus S.H. Wright, 1897

Elliptio (s.s.) lucidus (Lea, 1863)

Elliptio (s.s.) marshii (Wright, B.H., 1888)

Elliptio (s.s.) masoni (Conrad, 1834)
+ Unio merus Lea, 1852
+ Unio castus Simpson, 1900

Elliptio (s.s.) micans (Lea, 1857)
+ Unio perlucens Lea, 1863

Elliptio (s.s.) naviculoides (Lea, 1857)

Elliptio (s.s.) nigellus (Lea, 1853)
+ Unio denigratus Lea, 1857
+ Unio purpurellus Lea, 1857

Elliptio (s.s.) niger (Rafinesque, 1820)
+ Unio crassidens Lamarck, 1819
+ Unio (Elliptio) nigra var. maculata Rafinesque, 1820
+ Unio cuneatus Barnes, 1823
+ Unio discus Sowerby, 1868

Elliptio (s.s.) niger-danielsi (Wright, B.H., 1899)

Elliptio (s.s.) niger-incrassatus (Lea, 1840)

Elliptio (s.s.) nolani (Wright, B.H., 1888)

Elliptio (s.s.) obnubilus (Lea, 1857)
+ Unio opacus Lea, 1857
+ Unio aequatus Lea, 1857

Elliptio (s.s.) occultus (Lea, 1841)

Elliptio (s.s.) perstriatus (Lea, 1852)
+ Unio gracilentus Lea, 1857
+ Unio perlatus Lea, 1863

Elliptio (s.s.) polymorphus (Wright, B.H., 1899)

Elliptio (s.s.) productus (Conrad, 1836)
+ Unio fisherianus Lea, 1838
+ Unio nasutus Conrad, 1838
+ Unio barrotti Küster, 1861
+ Unio nasutulus Lea, 1866

Elliptio (s.s.) pusillus (Lea, 1840)
+ Unio buxeus Lea, 1852
+ Unio corvus Lea, 1859
+ Unio vestitus Lea, 1861

Elliptio (s.s.) pygmaeus (Lea, 1852)
+ Unio pygamaeus Simpson, 1914

Elliptio (s.s.) raveneli (Conrad, 1834)
+ Unio confertus Lea, 1834
+ Margarita (Unio) watereensis Lea, 1836
+ Unio santeensis Lea, 1871

Elliptio (s.s.) rostraeformis (Lea, 1856)
+ Unio maconensis Lea, 1857

Elliptio (s.s.) shepardianus (Lea, 1834)

Elliptio (s.s.) similis (Lea, 1857)

Elliptio (s.s.) spadiceus (Lea, 1857)

Elliptio (s.s.) spissus (Lea, 1859)

Elliptio (s.s.) subluridus (Simpson, 1900)

Elliptio (s.s.) subniger (Lea, 1857)
+ Unio burkensis Lea, 1859

Elliptio (s.s.) suttoni (Wright, B.H., 1897)

Elliptio (s.s.) tenuisculus (Frierson, 1911)

Elliptio (s.s.) tortivus (Lea, 1840)
+ Unio tetricus Lea, 1857

Elliptio (s.s.) viridicatus (Lea, 1857)

Elliptio (s.s.) viridulus (Lea, 1863)

Elliptio (s.s.) waccamawensis (Lea, 1863)

Elliptio (s.s.) waltoni (Wright, B.H., 1888)

Glebula suborbiculata (Lamarck, 1819)
+ Unio rotundata Lamarck, 1819
+ Obliquaria (Plagiola) decorticata Rafinesque, 1820
+ Unio glebulus Say, 1831
+ Unio subglobosus Lea, 1834
+ Unio grandensis Conrad, 1855

Gonidea angulata (Lea, 1838)
+ Anodon feminalis Gould, 1850
+ Anodonta randalli Trask, 1854
+ Anodon biangulata Sowerby, 1869

Gonidea angulata-haroldiana Dall, 1908

Gonidea angulata-subangulata (Hemphill, 1891)

Hemistena lata (Rafinesque, 1820)
+ Unio dehiscens Say, 1829
+ Unio oriens Lea, 1831
+ Odatelia radiata Rafinesque, 1832
+ Anodonta prelonga Rafinesque, 1832
+ Unio hildrethi Delessert, 1841

Lampsilis (Actinonaias) computata (Crosse & Fischer, 1893)

Lampsilis (Actinonaias) coyensis Pilsbry, 1909

Lampsilis (Actinonaias) gundlachi (Dunker, 1858)

Lampsilis (Actinonaias) meddellina [sic] (Lea, 1838)

Lampsilis (Actinonaias) moctezumensis Pilsbry, 1909

Lampsilis (Actinonaias) ruthveni Baker, H.B., 1922

Lampsilis (Actinonaias) sapotalensis (Lea, 1841)

Lampsilis (Actinonaias) signata Pilsbry, 1909

Lampsilis (Actinonaias) undivaga Pilsbry, 1909

Lampsilis (Cyrtonaias) alienigena (Crosse & Fischer, 1893)

Lampsilis (Cyrtonaias) explicata (Morelet, 1849)

Lampsilis (Cyrtonaias) livida Simpson, 1900
+ Unio testudineus Reeve, 1865
+ Unio explicatus Fischer & Crosse, 1894

Lampsilis (Cyrtonaias) saladoensis (Lea, 1860)
+ Unio subtrapezius Philippi, 1847

Lampsilis (Cyrtonaias) sapperi (von Ihering, 1901)

Lampsilis (Cyrtonaias) tampicoensis (Lea, 1838)

Lampsilis (Cyrtonaias) tampicoensis-berlandieri (Lea, 1857)

Lampsilis (Cyrtonaias) tampicoensis-heermanni (Lea, 1862)

Lampsilis (Cyrtonaias) tampicoensis-kusteriana N.V.
+ Unio tampicoensis Küster, 1862

Lampsilis (Cyrtonaias) tampicoensis-tecomatensis (Lea, 1841)

Lampsilis (Cyrtonaias) umbrosa (Lea, 1856)
+ Unio verrauxi Küster, 1856
+ Unio veracruzensis Lea, 1868
+ Lampsilis rovirosai sanjuanensis H.B. Baker, 1922

Lampsilis (Delphinonaias) delphinulus (Morelet, 1849)

Lampsilis (Delphinonaias) paludosa (Morelet, 1849)

Lampsilis (Delphinonaias) scutulata (Morelet, 1849)

Lampsilis (Disconaias) aztecorum (Philippi, 1847)
+ Unio strebelii Lea, 1866
+ Unio soledadensis Crosse & Fischer, 1893

Lampsilis (Disconaias) discus (Lea, 1838)

Lampsilis (Disconaias) fimbriata Frierson, 1907
+ Unio aztecorum “forma” major Martens, 1900
+ Lampsilis (Proptera) salinasensis Dall, 1908
+ Actinonaias (Disconaias) walkeri H.B. Baker, 1922

Lampsilis (Disconaias) martensi Frierson, 1927
+ Unio aztecorum Martens, 1900

Lampsilis (Disconaias) novi-leonensis [sic] Pilsbry, 1908

Lampsilis (Disconaias) panucoensis [sic] (von dem Busch in Philippi, 1843)
+ Unio mexicanus Sowerby, 1867
+ Unio lapidosus Kobelt, 1893
+ Unio (Lampsilis) discus var. connectens Martens, 1900

Lampsilis (Disconaias) pilsbryana Frierson, 1927
+ Unio strebeli Pilsbry, 1910
+ Lampsilis purpuriatus Frierson, 1912

Lampsilis (Disconaias) purpuriata (Say, 1831)
+ Unio aztecorum Martens, 1900

Lampsilis (Friersonia) iridella Pilsbry & Frierson, 1907

Lampsilis (Friersonia) semirasa Pilsbry, 1909

Lampsilis (Leptodea) fragilis (Rafinesque, 1820)
+ Unio fragilis Swainson, 1823
+ Unio gracilis Barnes, 1823
+ Unio (Niaa) atrata Swainson, 1823

Lampsilis (Leptodea) fragilis-simpsoni Ferriss, 1900

Lampsilis (Leptodea) leptodon (Rafinesque, 1820)
+ Anodon purpurascens Swainson, 1823
+ Unio planus Barnes, 1823
+ Symphynota tenuissima Lea, 1829

Lampsilis (Leptodea) velum (Say, 1829)
+ Unio planus Barnes, 1823
+ Lampsilis blatchleyi Daniels, 1902

Lampsilis (Ligumia) australis Simpson, 1900

Lampsilis (Ligumia) borealis (Gray, 1882)

Lampsilis (Ligumia) bracteata (Gould, 1855)

Lampsilis (Ligumia) delumbis (Conrad, 1834)
+ Unio vaughanianus Lea, 1838
+ Unio contiguus Lea, 1861

Lampsilis (Ligumia) fabacea (Lea, 1861)

Lampsilis (Ligumia) fasciata (Rafinesque, 1820)
+ Unio luteola Lamarck, 1819
+ Unio inflatus Barnes, 1823
+ Unio siliquoideus Barnes, 1823
+ Unio childreni Hanley, 1843
+ Unio distans J.G. Anthony, 1865

Lampsilis (Ligumia) fasciata-claibornensis (Lea, 1838)
+ Unio obtusus Lea, 1840
+ Unio regularis Sowerby, 1868

Lampsilis (Ligumia) fasciata-hydiana (Lea, 1838)
+ Unio approximus Lea, 1845
+ Unio affinis Lea, 1852
+ Unio placitus Lea, 1852

Lampsilis (Ligumia) fasciata-opalina (Anthony, J.G., 1866)

Lampsilis (Ligumia) fasciata-rosacea (DeKay, 1843)

Lampsilis (Ligumia) fasciata-straminea (Conrad, 1834)
+ Unio pallescens Lea, 1845

Lampsilis (Ligumia) fasciata-superiorensis (Marsh, 1897)

Lampsilis (Ligumia) gracilior (Lea, 1856)
+ Unio obfuscus Lea, 1857

Lampsilis (Ligumia) lienosa (Conrad, 1834)
+ Unio saxeus Conrad, 1838
+ Unio caliginosus Lea, 1845
+ Unio gouldii Lea, 1845
+ Unio nigerrimus Lea, 1852
+ Unio proximus Lea, 1852
+ Unio subellipsis Lea, 1856
+ Unio concestator Lea, 1857
+ Unio apicinus Lea, 1857
+ Unio intercedens Lea, 1857
+ Unio porphyreus Lea, 1861
+ Unio fuligo Reeve, 1865
+ Unio fontanus Conrad, 1866
+ Unio genuinus Lea, 1868
+ Unio unicostatus B.H. Wright, 1899

Lampsilis (Ligumia) menkiana (Lea, 1838)
+ Obliquaria (Plagiola) interrupta Rafinesque, 1820
+ Unio interruptus Lea, 1838
+ Unio pulcher Lea, 1838
+ Unio latiradiatus Conrad, 1838
+ Unio perdix Reeve, 1864

Lampsilis (Ligumia) modioliformis (Lea, 1834)
+ Unio delumbis Küster, 1861

Lampsilis (Ligumia) nasuta (Say, 1817)
+ Obliquaria (Ellipsaria) attenuata Rafinesque, 1820
+ Unio rostrata Valenciennes, 1827
+ Unio fisherianus Küster, 1861
+ Unio vaughanianus Sowerby, 1868

Lampsilis (Ligumia) nebulosa (Conrad, 1834)
+ Unio cumberlandicus Lea, 1838
+ Unio glaber Lea, 1838
+ Unio simus Lea, 1838
+ Unio notatus Lea, 1838
+ Margaron (Unio) cumberlandianus Lea, 1852
+ Unio fucatus Lea, 1860
+ Unio discrepans Lea, 1860
+ Unio linguaeformis Lea, 1860
+ Unio scitulus Lea, 1860
+ Unio perpictus Lea, 1860
+ Unio proximus Küster, 1861
+ Unio subrostratus Küster, 1861
+ Unio sparus Lea, 1868

Lampsilis (Ligumia) nervosa (Rafinesque, 1820)
+ Unio iris Lea, 1829
+ Unio novieboraci Lea, 1838
+ Unio creperus Lea, 1838
+ Unio dactylus Lea, 1840
+ Unio fatuus Lea, 1840
+ Unio amoenus Lea, 1840
+ Unio subrostratus Reeve, 1864

Lampsilis (Ligumia) ogeecheensis (Conrad, 1849)
+ Unio concavus Lea, 1852
+ Unio sudus Lea, 1857

Lampsilis (Ligumia) ortmanni (Walker, 1925)

Lampsilis (Ligumia) perpasta (Lea, 1861)

Lampsilis (Ligumia) picta (Lea, 1834)
+ Unio camelopardilis Lea, 1860

Lampsilis (Ligumia) powellii (Lea, 1853)

Lampsilis (Ligumia) prattii (Lea, 1858)

Lampsilis (Ligumia) propia [sic] (Lea, 1865)

Lampsilis (Ligumia) radians (Lea, 1857)
+ Unio jonesii Lea, 1859
+ Unio plancus Lea, 1860
+ Unio difficilis Lea, 1868

Lampsilis (Ligumia) radiata (Gmelin, 1791)
+ Unio virginiana Lamarck, 1819
+ Unio lineata Bory de St. Vincent, 1827
+ Unio oblongatus Wood, 1828
+ Unio elongata Goodrich, 1859
+ Unio obliquiradiatus Reeve, 1865

Lampsilis (Ligumia) radiata-mellina [sic] (Conrad, 1838)

Lampsilis (Ligumia) radiata-oneidensis Baker, F.C., 1918

Lampsilis (Ligumia) radiata-tenebrosa (Conrad, 1834)
+ Margarita (Unio) tenerus Lea, 1836
+ Unio conspicuus Lea, 1872

Lampsilis (Ligumia) recta (Lamarck, 1819)
+ Unio sageri Conrad, 1836

Lampsilis (Ligumia) recta-latissima (Rafinesque, 1820)
+ Unio praelongus Barnes, 1823
+ Unio leprosus Miles, 1861

Lampsilis (Ligumia) reeviana [sic] (Lea, 1852)

Lampsilis (Ligumia) reeviana-brevicula (Call, 1887)
+ Lampsilis brittsi Simpson, 1900

Lampsilis (Ligumia) stagnalis (Conrad, 1849)

Lampsilis (Ligumia) streckeri Frierson, 1927

Lampsilis (Ligumia) subangulata (Lea, 1840)
+ Unio kirklandianus S.H. Wright, 1897

Lampsilis (Ligumia) subrostrata (Say, 1831)
+ Unio muhlfeldianus Lea, 1838
+ Unio mississippiensis Conrad, 1850
+ Lampsilis nashvillensis Agassiz, 1852
+ Unio rutersvillensis Lea, 1859
+ Unio cocoduensis Reeve, 1865
+ Unio topekaensis Lea, 1868

Lampsilis (Ligumia) subrostrata-furva Simpson, 1914

Lampsilis (Ligumia) taeniata (Conrad, 1834)
+ Unio tennesseensis Lea, 1840
+ Unio lindsleyi Lea, 1860
+ Unio punctatus Lea, 1865
+ Unio camelopardalis Sowerby, 1866

Lampsilis (Ligumia) tenera (Lea, 1840)
+ Unio regularis Lea, 1841

Lampsilis (Ligumia) teres (Rafinesque, 1820)
+ Unio siliquoideus Barnes, 1823
+ Unio anodontoides Lea, 1831

Lampsilis (Ligumia) teres-fallaciosa Simpson, 1900 [sic]

Lampsilis (Ligumia) teres-floridensis (Lea, 1852)

Lampsilis (Ligumia) vanuxemensis (Lea, 1838)
+ Unio obscurus Lea, 1838
+ Unio nitens Lea, 1840
+ Unio puniceus Haldeman, 1842
+ Unio tenebricus Lea, 1857
+ Unio umbrans Lea, 1857
+ Unio pybasii Lea, 1858
+ Unio copei Lea, 1868
+ Margaron (Unio) vanuxemii Lea, 1870
+ Unio dispansus Lea, 1871

Lampsilis (Ligumia) vibex (Conrad, 1834)
+ Unio exiguus Lea, 1840
+ Unio prevostianus Lea, 1852
+ Unio rutilans Lea, 1856

Lampsilis (Ligumia) vibex-dispar (Lea, 1860)

Lampsilis (Ligumia) vibex-nigrina (Lea, 1852)
+ Unio averellii B.H. Wright, 1888

Lampsilis (Ligumia) vibex-planicostata (Lea, 1860)

Lampsilis (Ligumia) virescens (Lea, 1858)

Lampsilis (Ligumia) zeigleriana (Lea, 1838)

Lampsilis (Ortmanniana) abruptus (Say, 1831)
+ Unio suborbiculatus of Authors, unknown year
+ Toxolasma cyclips Rafinesque, 1831
+ Margarita (Unio) orbiculatus Lea, 1836

Lampsilis (Ortmanniana) carinata (Barnes, 1823)
+ Unio ligamentina Lamarck, 1819
+ Unio ellipticus Barnes, 1823
+ Mya gravis Wood, 1828
+ Unio ellipsarius Say, 1834
+ Unio fasciatus Conrad, 1835
+ Unio luteolus Sowerby, 1867
+ Unio crassidens Sowerby, 1868
+ Unio venustus Sowerby, 1868

Lampsilis (Ortmanniana) carinata-calendis (Rafinesque, 1831)
+ Unio crassus Sowerby, 1868
+ Lampsilis (sec. Eurynia) ligamentina var. gibbus Simpson, 1900

Lampsilis (Ortmanniana) carinata-pinguis (Lea, 1857)

Lampsilis (Ortmanniana) carinata-upsoni (Marsh, 1887)

Lampsilis (Ortmanniana) higginsii (Lea, 1857)
+ Unio orbiculatus Call, 1900

Lampsilis (Venusta) arkansensis [sic] (Lea, 1862)

Lampsilis (Venusta) constricta (Conrad, 1838)
+ Unio genthii Lea, 1857

Lampsilis (Venusta) ellipsiformis (Conrad, 1836)
+ Unio mucronatus Barnes, 1823
+ Unio spatulatus Lea, 1845

Lampsilis (Venusta) pleasii (Marsh, 1891)

Lampsilis (Venusta) trabalis (Conrad, 1834)
+ Unio troostensis Lea, 1834
+ Unio glans Conrad, 1836
+ Unio perpurpureus Lea, 1861
+ Unio maestus Küster, 1861
+ Unio vanuxemensis Sowerby, 1866
+ Unio troostii Lea, 1870

Lampsilis (Venusta) venusta (Lea, 1838)

Lampsilis (Villosa) amygdalum (Lea, 1843)
+ Unio trossulus Lea, 1843
+ Unio papyraceus Gould, 1845
+ Unio lepidus Gould, 1856

Lampsilis (Villosa) pellucidus (Lea, 1845)

Lampsilis (Villosa) vesicularis (Lea, 1872)
+ Unio minor of Authors, unknown year
+ Unio singleyanus Marsh, 1891

Lampsilis (Villosa) villosa (Wright, B.H., 1898)

Lampsilis (Villosa) wrightiana Frierson, 1927

Lampsilis (s.s.) altilis (Conrad, 1834)
+ Unio clarkianus Lea, 1852

Lampsilis (s.s.) cardium Rafinesque, 1820
+ Unio ventricosus Barnes, 1823
+ Unio occidens Lea, 1829
+ Unio subovatus Lea, 1831
+ Unio lenis Conrad, 1838
+ Unio ovatus Deshayes, 1839
+ Unio cariosus De Kay, 1843
+ Unio latissimus Sowerby, 1868

Lampsilis (s.s.) cardium-lurida Simpson, 1914

Lampsilis (s.s.) cardium-satura (Lea, 1853)
+ Unio capax Green, 1832

Lampsilis (s.s.) cariosa (Say, 1817)
+ Unio luteola Lamarck, 1819
+ Lampsilis pallida Rafinesque, 1820
+ Unio ovatus Valenciennes, 1827
+ Unio oratus Conrad, 1849
+ Unio canadensis Lea, 1857

Lampsilis (s.s.) dolabraeformis (Lea, 1838)

Lampsilis (s.s.) fasciola Rafinesque, 1820
+ Unio multiradiatus Lea, 1829
+ Unio ligamentinus Deshayes, 1835
+ Unio perradiatus Lea, 1858
+ Unio subovatus Sowerby, 1868

Lampsilis (s.s.) ochracea (Say, 1817)
+ Lampsilis rosea Rafinesque, 1820
+ Unio radiatus Barnes, 1823
+ Unio boydianus Lea, 1840
+ Unio crocatus Lea, 1841

Lampsilis (s.s.) ornatus (Conrad, 1835)
+ Unio lineatus Lea, 1840
+ Unio excavatus Lea, 1857
+ Lampsilis (s.s.) binominatus Simpson, 1900

Lampsilis (s.s.) ovatus (Say, 1817)

Lampsilis (s.s.) pectorosa (Conrad, 1834)
+ Unio perdix Lea, 1834

Lampsilis (s.s.) pectorosa-biangularis (Lea, 1840)
+ Bariosta vittatis Rafinesque, 1831
+ Unio biangulatus Lea, 1840

Lampsilis (s.s.) perovalis (Conrad, 1834)
+ Unio doliaris Lea, 1865

Lampsilis (s.s.) rafinesqueana Frierson, 1927

Lampsilis (s.s.) sowerbyana Frierson, 1927
+ Unio pictus Sowerby, 1868

Lampsilis (s.s.) spillmani (Lea, 1861)
+ Unio gerhardtii Lea, 1862

Lampsilis (s.s.) splendida (Lea, 1838)
+ Unio rosaceus Conrad, 1849
+ Unio regularis Sowerby, 1866

Lasmigona (Platynaias) charlottensis (Lea, 1863)

Lasmigona (Platynaias) decorata (Lea, 1852)
+ Unio insolidus Lea, 1872

Lasmigona (Platynaias) quadrata (Lea, 1861)

Lasmigona (Platynaias) subviridis (Conrad, 1835)
+ Unio tappanianus Lea, 1838
+ Unio hyalinus Lea, 1845
+ Unio pertenuis Lea, 1863

Lasmigona (Platynaias) subviridis-neglecta (Lea, 1843)

Lasmigona (Platynaias) viridis (Rafinesque, 1820)
+ Symphynota compressa Lea, 1829
+ Unio alasmodontina Lea, 1829
+ Margaron (Unio) pressus Lea, 1852

Lasmigona (Platynaias) viridis-plebia (Adams, C.B., 1842)

Lasmigona (Pterosyna) complanata (Barnes, 1823)
+ Complanaria gigas Swainson, 1840

Lasmigona (Pterosyna) complanata-katherinae (Lea, 1838)

Lasmigona (s.s.) costata (Rafinesque, 1820)
+ Alasmodonta rugosa Barnes, 1823

Lasmigona (s.s.) costata-ereganensis Grier, 1918

Lasmigona (s.s.) costata-viridis (Rafinesque, 1831)

Leila (Pseudoleila) ciconia (Gould, 1851)
+ Anodon ciconia Sowerby, 1870
+ Anodon glaucus Sowerby, 1870
+ Anodonta glauca var. sinaloensis Crosse & Fischer, 1884

Leila (Pseudoleila) nicaragua [sic] (Philippi, 1848)
+ Anodonta bridgesii Lea, 1868
+ Anodonta jewettiana Lea, 1868
+ Anodonta jewettii Lea, 1868

Leila (Pseudoleila) trapezialis [sic]-glauca (Valenciennes, 1827)

Lemiox fabalis (Lea, 1831)
+ Unio capillus Say, 1831
+ Unio lapillus Say, 1831

Lemiox rimosus (Rafinesque, 1831)
+ Unio caelatus Conrad, 1834

Margaritana hembeli (Conrad, 1838)

Margaritana margaritifera (Linnaeus, 1758)
+ Alasmodonta arcuata Barnes, 1823
+ Alasmodon falcata Gould, 1850
+ Alasmodon yubaensis Trask, 1854

Medionidus acutissimus (Lea, 1831)
+ Unio rubellinus Lea, 1857
+ Unio parvulus Lea, 1860
+ Unio semiplicatus Küster, 1862

Medionidus conradicus (Lea, 1834)
+ Obliquaria plateolus Rafinesque, 1831
+ Unio conradius Conrad, 1838
+ Margaron (Unio) conradianus Lea, 1870

Medionidus penicillatus (Lea, 1857)
+ Unio kingii B.H. Wright, 1900

Medionidus simpsonianus Walker, 1905

Medionidus walkeri (Wright, S.H., 1897)

Mycetopoda weddellii (Húpe, 1857)
+ Mycetopus subsinuatus Sowerby, 1868

Nodularia aegyptiacus (Cailliaud, 1827)
+ Unio troostensis Sowerby, 1866

Nodularia laevirostris (Benson, 1862)
+ Unio bicaelatus Reeve, 1865

Obliquaria reflexa Rafinesque, 1820
+ Unio cornutus Barnes, 1823
+ Unio torulosus Short & Eaton, 1831

Obliquaria reflexa-conradi N.V.

Obovaria (Pseudoon) castanea (Lea, 1831)

Obovaria (Pseudoon) curtus (Lea, 1859)

Obovaria (Pseudoon) jacksoniana (Frierson, 1912)

Obovaria (Pseudoon) olivaria (Rafinesque, 1820)
+ Unio brevialis Sowerby & Sowerby, 1821
+ Unio ellipsis Lea, 1828
+ Diplasma vitrea Potiez & Michaud, 1844
+ Unio taitanus Sowerby, 1868
+ Unio mytilloides Frierson, 1927

Obovaria (s.s.) levigata (Rafinesque, 1820)
+ Unio lens Lea, 1831
+ Obovaria lens var. parva Simpson, 1914

Obovaria (s.s.) retusa (Lamarck, 1819)
+ Obovaria torsa Rafinesque, 1820
+ Unio orbiculatus Hildreth, 1828
+ Unio incurvis Say, 1829

Obovaria (s.s.) rotulata (Wright, B.H., 1899)

Obovaria (s.s.) subrotunda (Rafinesque, 1820)
+ Unio (Aximedia) elliptica Rafinesque, 1820
+ Unio (Aximedia) zonalis Rafinesque, 1820
+ Unio rotundus Wood, 1828
+ Unio circulus Lea, 1829
+ Unio leibii Lea, 1862

Obovaria (s.s.) subrotunda-depygis (Conrad, 1866)

Obovaria (s.s.) subrotunda-uber (Conrad, 1866)

Obovaria (s.s.) subrotunda-unicolor (Lea, 1845)
+ Unio tinkeri B.H. Wright, 1899

Parreysia robsoni Frierson, 1927
+ Unio pumilus Sowerby, 1866

Pegias fabula (Lea, 1838)
+ Margaritana curreyiana Lea, 1840

Plagiola lineolata (Rafinesque, 1820)
+ Obliquaria (Plagiola) depressa Rafinesque, 1820
+ Unio securis Lea, 1829

Pleurobema (Lexingtonia) castum (Lea, 1860)

Pleurobema (Lexingtonia) subplanum (Conrad, 1837)
+ Unio pumilus Lea, 1838
+ Unio striatulus Lea, 1857
+ Unio brimleyi S.H. Wright, 1897

Pleurobema (Lexingtonia) utriculum (Lea, 1845)

Pleurobema (Plethobasus) cicatricoideum [sic] (Frierson, 1911)

Pleurobema (Plethobasus) compertum (Frierson, 1911)

Pleurobema (Plethobasus) cyphyum (Rafinesque, 1820)
+ Unio aesopus Green, 1827
+ Unio cicatricosus Say, 1829
+ Unio scyphius Küster, 1861

Pleurobema (Plethobasus) cyphyum-phillipsi (Conrad, 1835)

Pleurobema (Plethobasus) detectum (Frierson, 1911)
+ Unio varicosus Lea, 1831

Pleurobema (s.s.) aldrichi Frierson, 1927

Pleurobema (s.s.) altum (Conrad, 1854)

Pleurobema (s.s.) amabile (Lea, 1865)

Pleurobema (s.s.) avellana (Simpson, 1900)

Pleurobema (s.s.) bulbosum (Lea, 1857)
+ Pleurobema patsaligensis Simpson, 1900

Pleurobema (s.s.) clava-patulum (Lea, 1829)

Pleurobema (s.s.) concolor (Lea, 1861)
+ Unio pinkstoni S.H. Wright, 1897

Pleurobema (s.s.) decisus (Lea, 1831)
+ Unio scalenius Say, 1834
+ Unio crebrivittatus Lea, 1861
+ Unio anaticulus Lea, 1861
+ Unio consanguineus Lea, 1861
+ Unio medius Reeve, 1864

Pleurobema (s.s.) decisus-chattanoogaensis (Lea, 1858)

Pleurobema (s.s.) fibuloides (Lea, 1859)

Pleurobema (s.s.) fictum Frierson, 1927

Pleurobema (s.s.) flavidulum (Lea, 1861)

Pleurobema (s.s.) furvum (Conrad, 1834)

Pleurobema (s.s.) gibberum (Lea, 1838)

Pleurobema (s.s.) hagleri (Frierson, 1900)

Pleurobema (s.s.) hanleyanum [sic] (Lea, 1852)

Pleurobema (s.s.) harperi (Wright, B.H., 1899)

Pleurobema (s.s.) hartmanianum (Lea, 1860)

Pleurobema (s.s.) instructum (Lea, 1861)
+ Unio verus Lea, 1861

Pleurobema (s.s.) interventum (Lea, 1861)
+ Unio pallidofulvus Lea, 1861
+ Unio hanleyanus Reeve, 1864

Pleurobema (s.s.) johannis (Lea, 1859)

Pleurobema (s.s.) lewisii (Lea, 1861)
+ Unio crapulus Lea, 1861

Pleurobema (s.s.) marshalli Frierson, 1927

Pleurobema (s.s.) modicum (Lea, 1857)

Pleurobema (s.s.) murrayense (Lea, 1868)

Pleurobema (s.s.) mytiloides Rafinesque, 1820
+ Unio clava Lamarck, 1819
+ Pleurobema cuneata Rafinesque, 1820
+ Unio clavus Conrad, 1835

Pleurobema (s.s.) nucleopsis (Conrad, 1849)
+ Unio medius Lea, 1861

Pleurobema (s.s.) oviformis (Conrad, 1834)
+ Unio patulus Conrad, 1838
+ Unio holstonensis Lea, 1840

Pleurobema (s.s.) perovatum (Conrad, 1834)
+ Unio nux Lea, 1852
+ Unio cinnamomicus Lea, 1861

Pleurobema (s.s.) pulvinulum (Lea, 1845)
+ Unio troschelianus Lea, 1852

Pleurobema (s.s.) pyriforme (Lea, 1857)
+ Unio reclusus B.H. Wright, 1898

Pleurobema (s.s.) rubellum (Conrad, 1834)
+ Unio rudis Conrad, 1837
+ Unio brumbyanus Lea, 1841
+ Unio stabilis Lea, 1861

Pleurobema (s.s.) showalteri (Lea, 1860)
+ Unio irrasus Lea, 1861

Pleurobema (s.s.) simulans (Lea, 1871)

Pleurobema (s.s.) striatum (Lea, 1840)
+ Unio litus Lea, 1871
+ Pleurobema simpsoni Vanatta, 1915

Pleurobema (s.s.) strodeanum (Wright, B.H., 1898)

Pleurobema (s.s.) taitianum (Lea, 1834)
+ Pleurobema tombigbeanum Frierson, 1908

Proptera alata (Say, 1817)

Proptera amphichaena (Frierson, 1898)

Proptera capax (Green, 1832)
+ Unio ventricosus Barnes, 1823
+ Symphynota globosa Lea, 1834

Proptera inflata (Lea, 1831)
+ Unio alabamensis Conrad, 1834

Proptera laevissima (Lea, 1829)
+ Unio planus Barnes, 1823
+ Unio ohiensis Say, 1834
+ Unio discoideus Sowerby, 1866

Proptera purpurata (Lamarck, 1819)
+ Unio ater Lea, 1829
+ Unio lugubris Say, 1832
+ Unio coloradoensis Lea, 1856
+ Unio permiscens Lea, 1859
+ Unio dolosus Sowerby, 1866

Proptera purpurata-poulsoni (Conrad, 1834)
+ Unio dolosus Lea, 1860

Proptera rovirosai (Pilsbry, 1900)

Psoronaias crocodilorum (Morelet, 1849)
+ Unio pliciferus Reeve, 1864
+ Unio crocodilorum var. G praestricta Fischer & Crosse, 1894
+ Unio crocodilorum var. B semipustulata Fischer & Crosse, 1894

Psoronaias distinctus (Crosse & Fischer, 1893)

Psoronaias guatemalensis (Simpson, 1900)

Psoronaias herrerae (Marshall, 1923)

Psoronaias kuxensis Frierson, 1917

Psoronaias martensi Frierson, 1927
+ Unio psoricus Martens, 1900

Psoronaias morini (Morelet, 1851)

Psoronaias ostreatus (Morelet, 1849)

Psoronaias percompressus (Crosse & Fischer, 1893) [sic]

Psoronaias plexoideus Frierson, 1927
+ Unio rusticus Sowerby, 1868

Psoronaias plexus (Conrad, 1838)
+ Unio carbonarius Lea, 1838
+ Unio pliciferus Lea, 1838

Psoronaias profunda (Simpson, 1914)

Psoronaias quadrata (Simpson, 1914)

Psoronaias rudis (Simpson, 1900)

Psoronaias semigranosus (von dem Busch, 1845)
+ Unio testudineus Morelet, 1849

Psoronaias semigranosus-corium (Reeve, 1864)

Psoronaias semigranosus-psoricus (Morelet, 1851)

Psoronaias usumacintae Crosse & Fischer, 1892

Ptychobranchus (Subtentus) subtentum (Say, 1825)

Ptychobranchus (s.s.) fasciolare (Rafinesque, 1820)
+ Obliquaria (Ellipsaria) sinuata Rafinesque, 1820
+ Unio phaseolus Hildreth, 1828
+ Unio planulatus Lea, 1829
+ Unio cultratus Rafinesque, 1831
+ Unio abacus Haldeman, 1842
+ Unio compressissimus Lea, 1845

Ptychobranchus (s.s.) fasciolare-arquatum (Conrad, 1854)

Ptychobranchus (s.s.) fasciolare-longa (Rafinesque, 1820)
+ Unio camelus Lea, 1834

Ptychobranchus (s.s.) foremanianum (Lea, 1842)
+ Unio velatus Conrad, 1854
+ Unio woodwardius Lea, 1857
+ Unio woodwardianus Lea, 1859
+ Unio trinacrus Lea, 1861

Ptychobranchus (s.s.) greeni (Conrad, 1834)
+ Unio simplex Lea, 1845
+ Unio flavescens Lea, 1845

Ptychobranchus (s.s.) occidentalis (Conrad, 1836)
+ Ptychobranchus clintonensis Simpson, 1900

Quadrula (Bullata) archeri Frierson, 1905

Quadrula (Bullata) aureus (Lea, 1859)
+ Unio petrinus Frierson, 1927

Quadrula (Bullata) couchiana (Lea, 1860)

Quadrula (Bullata) houstonensis (Lea, 1859)

Quadrula (Bullata) nodulata (Rafinesque, 1820)
+ Unio pustulatus Lea, 1831
+ Unio dorfeuillianus Lea, 1838

Quadrula (Bullata) petrina (Gould, 1855)
+ Unio bollii Call, 1881

Quadrula (Bullata) pustulosa (Lea, 1831)
+ Obliquaria (Quadrula) bullata Rafinesque, 1820
+ Unio verrucosa Valenciennes, 1827
+ Unio nodulosus Say, 1834

Quadrula (Bullata) pustulosa-asperata (Lea, 1861)
+ Unio pernodosus Lea, 1845

Quadrula (Bullata) pustulosa-keineriana [sic] (Lea, 1853)

Quadrula (Bullata) pustulosa-mortoni (Conrad, 1836)
+ Unio turgidus Lea, 1838
+ Unio nodiferus Conrad, 1841

Quadrula (Bullata) pustulosa-paupercula (Lea, 1861)

Quadrula (Bullata) pustulosa-prasina (Conrad, 1834)
+ Unio schoolcraftensis Lea, 1834
+ Unio schoolcraftii Lea, 1870

Quadrula (Bullata) pustulosa-refulgens (Lea, 1868)
+ Unio sphaericus Lea, 1868

Quadrula (Bullata) pustulosa-vallata (Lea, 1868)
+ Unio cahabensis Lea, 1871

Quadrula (Cyclonaias) tuberculata (Rafinesque, 1820)
+ Unio verrucosus Barnes, 1823
+ Unio tuberculosus Humboldt & Bonpland, 1827

Quadrula (Cyclonaias) tuberculata-granifera (Lea, 1838)

Quadrula (Cyclonaias) tuberculata-pusilla (Simpson, 1900)

Quadrula (Cyclonaias) tuberculata-utterbackiana Frierson, 1927
+ Plethobasus cooperianus Utterback, 1915

Quadrula (Fusconia [sic]) antrosa (Rafinesque, 1820)
+ Obovaria pachostea Rafinesque, 1820
+ Obovaria obovalis Rafinesque, 1820
+ Unio ebenus Lea, 1831
+ Unio obliqua Ferussac, 1835
+ Unio gouldianus Jay, 1839
+ Unio (s.s.) mytiloides Swainson, 1840
+ Unio subrotundus Call, 1894
+ Unio globatus Call, 1894

Quadrula (Fusconia [sic]) askewi (Marsh, 1896)

Quadrula (Fusconia [sic]) beadleana [sic] (Lea, 1861)
+ Unio chickasawhensis Lea, 1861

Quadrula (Fusconia [sic]) bursa-pastoris (Wright, B.H., 1896)

Quadrula (Fusconia [sic]) flava (Rafinesque, 1820)
+ Unio rubiginosus Lea, 1829
+ Unio cerinus Conrad, 1838
+ Unio coccineus Reeve, 1865

Quadrula (Fusconia [sic]) flava-nasuta Simpson, 1914
+ Quadrula (sec. Fusconaia) castanea Simpson, 1914

Quadrula (Fusconia [sic]) flava-negata (Lea, 1861)

Quadrula (Fusconia [sic]) flava-parvula (Grier, 1919)

Quadrula (Fusconia [sic]) flava-sampsoniana Frierson, 1927

Quadrula (Fusconia [sic]) glandacea (Lea, 1861)

Quadrula (Fusconia [sic]) hebetata (Conrad, 1854)
+ Unio rubidus Lea, 1861
+ Unio succisus Sowerby, 1866

Quadrula (Fusconia [sic]) kirtlandiana (Lea, 1834)

Quadrula (Fusconia [sic]) lananensis Frierson, 1901

Quadrula (Fusconia [sic]) ozarkensis (Call, 1887)

Quadrula (Fusconia [sic]) pannosa (Simpson, 1900)

Quadrula (Fusconia [sic]) pilaris (Lea, 1840)
+ Unio lesueurianus Lea, 1840
+ Unio globatus Lea, 1871
+ Quadrula flexuosa Simpson, 1900
+ Quadrula beauchampii Marsh, 1902
+ Quadrula andrewsae Marsh, 1902
+ Quadrula andrewsii Marsh, 1902

Quadrula (Fusconia [sic]) rubidula Frierson, 1905

Quadrula (Fusconia [sic]) subelliptica (Simpson, 1900)

Quadrula (Fusconia [sic]) subrotunda (Lea, 1831)
+ Obliquaria (Sintoxia) sintoxia Rafinesque, 1820
+ Unio crassus Barnes, 1823
+ Obliquaria (Aximedia) venus Rafinesque, 1831
+ Unio politus Conrad, 1837
+ Unio ebenus Call, 1894

Quadrula (Fusconia [sic]) succissa (Lea, 1852)
+ Unio infucatus Conrad, 1834
+ Unio cacao Lea, 1859

Quadrula (Fusconia [sic]) succissa-wrightii Simpson, 1914

Quadrula (Fusconia [sic]) undata (Barnes, 1823)
+ Obliquaria (Sintoxia) lateralis Rafinesque, 1820
+ Unio triangularis Küster, 1852

Quadrula (Fusconia [sic]) undata-chunii (Lea, 1862)

Quadrula (Fusconia [sic]) undata-selecta (Wheeler, 1914)

Quadrula (Fusconia [sic]) undata-trigona (Lea, 1831)

Quadrula (Fusconia [sic]) undata-trigonoides (Frierson, 1916)

Quadrula (Fusconia [sic]) utterbackii (Frierson, 1916)

Quadrula (Obliquata) catilla (Conrad, 1836)
+ Obliquaria (Scalenaria) triangularis Rafinesque, 1820
+ Unio coccineus Lea, 1838
+ Unio solidus Lea, 1838
+ Unio fulgidus Lea, 1845

Quadrula (Obliquata) coccinea (Conrad, 1836)
+ Obliquaria rubra Rafinesque, 1820
+ Unio rubens Menke, 1828

Quadrula (Obliquata) coccinea-cunea (Conrad, 1838)

Quadrula (Obliquata) coccinea-magnalacustris Simpson, 1914
+ Quadrula (sec. Fusconaia) coccinea var. paupercula Simpson, 1900

Quadrula (Obliquata) cordata (Rafinesque, 1820)
+ Unio mytiloides Short & Eaton, 1831
+ Unio obliquus Call, 1900

Quadrula (Obliquata) cordata-plena (Lea, 1840)

Quadrula (Obliquata) friersoni (Wright, B.H., 1896)

Quadrula (Obliquata) missouriensis (Marsh, 1901)

Quadrula (Obliquata) obliquata (Rafinesque, 1820)
+ Unio cardiacea Guérin-Méneville, 1823
+ Unio pyramidatus Lea, 1831
+ Unio mytiloides Conrad, 1836
+ Unio ruber Conrad, 1853

Quadrula (Obliquata) ridellii [sic] (Lea, 1861)

Quadrula (Orthonymus) cylindrica (Say, 1817)
+ Unio naviformis Lamarck, 1819
+ Unio (Eurynia) solenoides Rafinesque, 1820
+ Unio rugosus Chenu, 1862

Quadrula (Orthonymus) cylindrica-strigillata (Wright, B.H., 1898)

Quadrula (Orthonymus) intermedia (Conrad, 1836)

Quadrula (Orthonymus) metanevra (Rafinesque, 1820)
+ Unio nodosus Barnes, 1823

Quadrula (Orthonymus) metanevra-tuberosa (Lea, 1840)
+ Unio sparsus Lea, 1841
+ Unio kleinianus Küster, 1861

Quadrula (Orthonymus) metanevra-wardii (Lea, 1862)
+ Unio rugosus Lea, 1852

Quadrula (Orthonymus) stapes (Lea, 1831)

Quadrula (Pleuronaia) analogia [sic] (Ortmann, 1917)
+ Unio edgarianus Reeve, 1864

Quadrula (Pleuronaia) argentea (Lea, 1841)
+ Unio decisus Küster, 1852
+ Unio lesleyi Lea, 1860
+ Unio raveneliensis Reeve, 1864
+ Unio fassinans Lea, 1868

Quadrula (Pleuronaia) barnesiana (Lea, 1838)
+ Unio bigbyensis Lea, 1841
+ Unio estabrookianus Lea, 1845
+ Unio tellicoensis Lea, 1872
+ Pleurobema fassinans var. rhomboidea Simpson, 1900

Quadrula (Pleuronaia) cor (Conrad, 1834)
+ Unio bournianus Lea, 1840
+ Unio edgarianus Lea, 1840
+ Unio obuncus Lea, 1871
+ Unio tuscumbiensis Lea, 1871
+ Unio andersonensis Lea, 1872

Quadrula (Pleuronaia) cuneola (Lea, 1840)
+ Unio clinchensis Lea, 1867

Quadrula (Pleuronaia) dolabelloides (Lea, 1840)
+ Unio thorntonii Lea, 1857
+ Unio mooresianus Lea, 1857
+ Unio mundus Reeve, 1864
+ Unio circumactus Lea, 1871
+ Unio recurvatus Lea, 1871
+ Unio appressus Lea, 1871
+ Unio flavidus Lea, 1872

Quadrula (Pleuronaia) georgiana (Lea, 1841)
+ Unio favosus Lea, 1856

Quadrula (Pleuronaia) meridithii [sic] (Lea, 1858)
+ Unio lenticularis Lea, 1872

Quadrula (Pleuronaia) munda (Lea, 1857)
+ Unio ornatus Lea, 1861
+ Unio lawii Lea, 1871
+ Unio pattinoides Lea, 1871
+ Unio bellulus Lea, 1872

Quadrula (Pleuronaia) pudica (Lea, 1860)
+ Unio lyonii Lea, 1865

Quadrula (Pleuronaia) raveneliana (Lea, 1834)

Quadrula (Pleuronaia) striatissima (Anthony, J.G., 1865)
+ Unio planior Lea, 1868
+ Unio brevis Lea, 1872
+ Unio conasaugaensis Lea, 1872
+ Unio swordianus S.H. Wright, 1897

Quadrula (Pleuronaia) tesserulae (Lea, 1862)
+ Unio acuens Lea, 1871

Quadrula (Pleuronaia) tumescens (Lea, 1845)
+ Unio radiosus Lea, 1871
+ Unio crudus Lea, 1871

Quadrula (Pleuronaia) valida (Lea, 1871)
+ Unio maculatus Conrad, 1834
+ Unio cuneolus Küster, 1861
+ Unio argenteus Sowerby, 1866
+ Pleurobema swordiana Simpson, 1900
+ Pleurobema conradi Vanatta, 1915

Quadrula (Quincuncina) burkei (Walker, 1922)

Quadrula (Quincuncina) securiformis (Conrad, 1849)
+ Unio infucatus Conrad, 1834
+ Unio liratus Shuttleworth, 1852
+ Unio sparsus Küster, 1861

Quadrula (Quincuncina) securiformis-kleiniana (Lea, 1853)

Quadrula (Quincuncina) vittata Frierson, 1927
+ Unio rotundatus Reeve, 1865

Quadrula (Striata) striata (Rafinesque, 1820)
+ Unio cooperianus Lea, 1834
+ Unio striatus Reeve, 1864
+ Unio asperatus Sowerby, 1868

Quadrula (Tritogonia) verrucosa (Rafinesque, 1820)
+ Unio tuberculatus Barnes, 1823
+ Unio (Theliderma) pustulata Swainson, 1840
+ Unio gigas Sowerby, 1867
+ Quadrula parkeri Geiser, 1911

Quadrula (s.s.) conjugans (Wright, B.H., 1899)

Quadrula (s.s.) quadrula (Rafinesque, 1820)
+ Unio rugosus Barnes, 1823
+ Unio lacrymosus Lea, 1828
+ Unio dombeyanus Barnes, 1828
+ Unio asperrimus Lea, 1831
+ Unio quadratus Reeve, 1864
+ Unio lunulatus Pratt, 1876

Quadrula (s.s.) quadrula-apiculata (Say, 1829)

Quadrula (s.s.) quadrula-aspera (Lea, 1831)
+ Tritogonia tuberculata var. obesa Simpson, 1900

Quadrula (s.s.) quadrula-forsheyi (Lea, 1859)

Quadrula (s.s.) quadrula-fragosa (Conrad, 1836)

Quadrula (s.s.) quadrula-nobilis (Conrad, 1854)

Quadrula (s.s.) quadrula-rumphiana (Lea, 1852)
+ Unio blandianus Lea, 1856

Quadrula (s.s.) quadrula-speciosa (Lea, 1862)

Simpsoniconcha ambigua (Say, 1825)
+ Unio hildrethianus Lea, 1834
+ Alasmidonta dubia Ferussac, 1835

Strophitus (Jugosus) wrightianus Walker, 1901

Strophitus (Pseudodontoideus) alabamensis (Lea, 1861)

Strophitus (Pseudodontoideus) gesneri (Lea, 1858)

Strophitus (Pseudodontoideus) spillmani (Lea, 1858)

Strophitus (s.s.) connasaugaensis (Lea, 1858)

Strophitus (s.s.) radiatus (Conrad, 1834)
+ Margaritana elliottii Lea, 1858
+ Margaritana elliptica Lea, 1859
+ Anodonta showalterii Lea, 1860

Strophitus (s.s.) subvexus (Conrad, 1834)
+ Margaritana tombigbeensis Lea, 1862
+ Margaritana columbensis Lea, 1867

Strophitus (s.s.) undulatus (Say, 1817)
+ Alasmodonta edentula Say, 1829
+ Anodon areolatus Swainson, 1829
+ Anodon unadilla De Kay, 1843
+ Anodonta tetragona Lea, 1845
+ Anodonta arkansensis Lea, 1852
+ Anodonta shaefferiana Lea, 1852
+ Anodon papyracea J.G. Anthony, 1865
+ Alasmodon rhombica J.G. Anthony, 1865
+ Anodon annulatus Sowerby, 1867
+ Anodon quadriplicatus Sowerby, 1870

Strophitus (s.s.) undulatus-ovatus Frierson, 1927

Strophitus (s.s.) undulatus-pennsylvanicus [sic] (Say, 1817)

Strophitus (s.s.) undulatus-rugosus (Swainson, 1822)

Strophitus (s.s.) undulatus-tennesseensis Frierson, 1927

Strophitus (s.s.) undulatus-virgatus (Conrad, 1836)
+ Anodonta wardiana Lea, 1838
+ Anodonta pavonia Lea, 1838

Truncilla cognata (Lea, 1860)

Truncilla donaciformis (Lea, 1828)
+ Unio zigzag Lea, 1829
+ Unio nervosa Conrad, 1834
+ Unio ziczac Hanley, 1843

Truncilla macrodon (Lea, 1859)

Truncilla truncata Rafinesque, 1820
+ Unio elegans Lea, 1831

Truncilla truncata-vermiculata Rafinesque, 1820