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                  Sun 07 Sep 2025  | 
              
              
  
The Freshwater Mussels (Unionoida) of the World (and other less consequential bivalves)
FM(U)otW(aolcb) is the web version of the MUSSEL Project Database. Follow the links to browse the data or use the custom Google search field. Either way, you win! 
This page documents data for R.I. Johnson (1978), such as genera and species attributed to that publication (including known misspellings, misidentifications, and other unavailable names) as well as taxonomic opinions, if available. Taxonomic opinions refer to uses of genera and species as valid and invalid in that work. The MUSSEL Project Database has moved to a new server, with a new URL! The new address for this page is: https://musselpdb.org/db.php?ty=publ&id=483 
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 Publication information 
Johnson, R.I. 1978. Systematics and zoogeography of Plagiola (= Dysnomia = Epioblasma), an almost extinct genus of freshwater mussels (Bivalvia: Unionidae) from middle North America. Bulletin of the Museum of Comparative Zoology 148: 239-321. 
Click here for online access. 
Attributed Species Names
  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)
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Taxonomic Opinions
	 Plagiola (Epioblasma) flexuosa (Rafinesque, 1820)
	 + Unio foliatus Hildreth, 1828
	 + Epioblasma biloba Rafinesque, 1831
	 + Truncilla lewisii Walker, 1910
	 
	Plagiola (Epioblasma) stewardsoni (Lea, 1852)
	 
	Plagiola (Pilea) haysiana (Lea, 1834)
	 + Unio sowerbianus Lea, 1834
	 
	Plagiola (Pilea) obliquata (Rafinesque, 1820)
	 + Unio sulcatus Lea, 1829
	 + Unio ridibundus Say, 1829
	 + Unio perplexus Say, 1829
	 + Unio flagellatus Say, 1830
	 + Unio pectitus Conrad, 1854
	 + Unio stewardsonii var. stewensoni de Gregorio, 1914
	 + Unio propesulcatus de Gregorio, 1914
	 
	Plagiola (Pilea) personata (Say, 1829)
	 + Unio pileus Lea, 1831
	 + Unio capillaris Lea, 1834
	 
	Plagiola (Torulosa) biemarginata (Lea, 1857)
	 
	Plagiola (Torulosa) capsaeformis (Lea, 1834)
	 
	Plagiola (Torulosa) florentina (Lea, 1857)
	 + Unio saccatus Küster, 1862
	 + Unio sacculus Reeve, 1864
	 + Truncilla walkeri Wilson & Clark, 1914
	 + Truncilla curtisii Utterback, 1916
	 
	Plagiola (Torulosa) propinqua (Lea, 1857)
	 
	Plagiola (Torulosa) sampsoni (Lea, 1862)
	 
	Plagiola (Torulosa) torulosa (Rafinesque, 1820)
	 + Amblema torulosa var. angulata Rafinesque, 1820
	 + Amblema gibbosa Rafinesque, 1820
	 + Unio perplexus Lea, 1831
	 + Unio gibbosus var. perobliquus Conrad, 1836
	 + Unio rangianus Lea, 1838
	 + Unio cincinnatiensis Lea, 1840
	 + Unio obliquus Potiez & Michaud, 1844
	 + Unio phillipsii Reeve, 1864
	 + Unio gubernaculum Reeve, 1865
	 + Truncilla (Scalenaria) sulcata var. delicata Simpson, 1900
	 
	Plagiola (Torulosa) turgidula (Lea, 1858)
	 + Unio nux Küster, 1861
	 + Unio deviatus Reeve, 1864
	 + Truncilla lefevrei Utterback, 1916
	 
	Plagiola (Truncillopsis) triquetra (Rafinesque, 1820)
	 + Unio triangularis Barnes, 1823
	 + Unio cuneatus Swainson, 1823
	 + Unio formosus Lea, 1831
	 + Unio triangularis var. pergibosus de Gregorio, 1914
	 + Unio triangularis var. longiusculus de Gregorio, 1914
	 
	Plagiola (s.s.) arcaeformis (Lea, 1831)
	 + Unio nexus Say, 1831
	 
	Plagiola (s.s.) interrupta Rafinesque, 1820
	 + Unio brevidens Lea, 1831
	 
	Plagiola (s.s.) lenior (Lea, 1840)
	 + Unio lenis Lea, 1840
	 
	Plagiola (s.s.) penita (Conrad, 1834)
	 + Unio metastriatus Conrad, 1838
	 + Unio othcaloogensis Lea, 1857
	 + Unio compactus Lea, 1859
	 + Unio modicellus Lea, 1859
	 
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