Anodonta fragilis Lamarck, 1819
Lamarck, 1819, Hist. Natur. Anim. sans Vert. 6: 85, sp. 4.
Type(s): TYPES MNHN_MPL_0035, les lacs de Terre-Nueve [Newfoundland].

Anodonta fragilis — Lamarck (1819), Lea (1834), Jay (1835), Ferussac (1835), Hanley (1843), Conrad (1853), Adams & Adams (1857), B.H. Wright (1888), Hoeh & Burch (1989)
Margarita (Anodonta) fragilis — Lea (1836), Lea (1838)
Margaron (Anodonta) fragilis — Lea (1852), Lea (1870)
Anodon fragilis — Sowerby (1867)
Anodonta marginata — Simpson (1900), Simpson (1914), F.C. Baker (1928)
Anodonta (s.s.) marginata — Frierson (1927), Haas (1969)
Anodonta (Pyganodon) cataracta fragilis — R.I. Johnson (1970), Kat (1983)
Anodonta cataracta fragilis — R.I. Johnson (1980), Kat (1983), Kat & Davis (1984), Turgeon et al. (1988)
Pyganodon fragilis — Hoeh (1990), Williams et al. (1993), Hoeh et al. (1995), Hoeh et al. (1996), ..., Krebs et al. (2019), Beauchamp et al. (2020), FMCS (2021), Graf & Cummings (2021)

Anodonta brooksiana van der Schalie, 1938
van der Schalie, 1938, Ann. Carnegie Mus. 27(12): 167-170, pl. 16.
Type(s): TYPE CM_187, Spout Pond, Arm, Ferryland District, Southern Shore, Newfoundland.

Anodonta brooksiana — van der Schalie (1938)
Anodonta (Pyganodon) brooksiana — Haas (1969)
Anodonta cataracta fragilis — R.I. Johnson (1980)
Pyganodon fragilis — Stanton et al. (2012)

Mytilus illitus Lightfoot, 1786
‘S.’ Lightfoot, 1786, Catalogue of the Portland Museum: 163, no 3551. [nomen nudum]

Mytilus illitus — Lightfoot (1786)
Mytilus fluviatilis — Dillwyn (1817)
Anodonta cataracta — Ferussac (1835)
Margarita (Anodonta) fluviatilis — Lea (1836), Lea (1838)
Margaron (Anodonta) fluviatilis — Lea (1852), Lea (1870)

Anodon flava J.G. Anthony, 1865
J.G. Anthony, 1865, Amer. J. Conch. 1(2): 160, pl. 14, fig. 3.
Type(s): HOLOTYPE MCZ_161866, Michigan.

Anodon flava — J.G. Anthony (1865)
Margaron (Anodonta) fragilis — Lea (1870)
Anodonta flava — B.H. Wright (1888)
Anodonta marginata — Simpson (1900), Simpson (1914)
Anodonta (s.s.) marginata — Frierson (1927), Haas (1969)

Anodon glandulosa J.G. Anthony, 1865
J.G. Anthony, 1865, Amer. J. Conch. 1(2): 163, pl. 16, fig. 3.
Type(s): HOLOTYPE MCZ_161869, Shears Lake, Kent Co., Michigan.

Anodon glandulosa — J.G. Anthony (1865)
Margaron (Anodonta) fragilis — Lea (1870)
Anodonta glandulosa — B.H. Wright (1888)
Anodonta marginata — Simpson (1900), Simpson (1914)
Anodonta (s.s.) marginata — Frierson (1927), Haas (1969)

Anodon irisans J.G. Anthony, 1865
J.G. Anthony, 1865, Amer. J. Conch. 1(2): 163, pl. 16, fig. 2.
Type(s): HOLOTYPE MCZ_161870, Bostwick’s Lake, Michigan.

Anodon irisans — J.G. Anthony (1865)
Margaron (Anodonta) fragilis — Lea (1870)
Anodonta irisans — B.H. Wright (1888)
Anodonta marginata — Simpson (1900), Simpson (1914), F.C. Baker (1928)
Anodonta (s.s.) marginata — Frierson (1927), Haas (1969)

Anodon pallida J.G. Anthony, 1865
J.G. Anthony, 1865, Amer. J. Conch. 1(2): 162, pl. 15, fig. 3.
Type(s): HOLOTYPE MCZ_161871, Michigan.

Anodon pallida — J.G. Anthony (1865)
Anodon pallidus — Sowerby (1867)
Margaron (Anodonta) fragilis — Lea (1870)
Anodonta pallida — B.H. Wright (1888)
Anodonta marginata — Simpson (1900), Simpson (1914)
Anodonta (s.s.) marginata — Frierson (1927), Haas (1969)

Anodon hordeum Sowerby, 1867
‘Gould’ Sowerby, 1867, Conch. Icon. 17: pl. 18, sp. 66.
(misidentified reference to Anodon horda Gould, 1855; error for Anodon horda Gould, 1855)

Anodon hordeum — Sowerby (1867)
Anodonta marginata — Simpson (1900), Simpson (1914)
Anodonta (Lastena) ohiensis-horda — Frierson (1927)
Anodonta (s.s.) marginata — Haas (1969)

Anodon subcylindracea Sowerby, 1867
‘Lea’ Sowerby, 1867, Conch. Icon. 17: pl. 15, fig. 47a. [in part]
(misidentified reference to Anodonta subcylindracea Lea, 1838)

Anodon subcylindracea — Sowerby (1867)
Anodonta marginata — Simpson (1900), Simpson (1914)
Anodonta (s.s.) marginata — Frierson (1927), Haas (1969)

Anodonta subcarinata Currier, 1867
Currier, 1867, Amer. J. Conch. 3(2): 113, pl. 6, fig. 5.

Anodonta subcarinata — Currier (1867), B.H. Wright (1888)
Margaron (Anodonta) fragilis — Lea (1870)
Anodonta marginata — Simpson (1900), Simpson (1914)
Anodonta (s.s.) marginata — Frierson (1927), Haas (1969)

Anodon exilis Sowerby, 1870
‘Lea’ Sowerby, 1870, Conch. Icon. 17: pl. 22, sp. 84.
(misidentified reference to Anodonta exilis Lea, 1838)

Anodon exilis — Sowerby (1870)
Anodonta marginata — Simpson (1900), Simpson (1914)
Anodonta (s.s.) marginata — Frierson (1927)

Anodon pholadiformis Sowerby, 1870
Sowerby, 1870, Conch. Icon. 17: pl. 27, sp. 106.

Anodon pholadiformis — Sowerby (1870)
Anodonta marginata — Simpson (1900), Simpson (1914)
Anodonta (s.s.) marginata — Frierson (1927), Haas (1969)

Taxonomic History (since 1900)

Anodonta marginata — Simpson (1900), Simpson (1914), F.C. Baker (1928)
Anodonta (s.s.) marginata — Frierson (1927), Haas (1969)
Anodonta (Lastena) ohiensis-horda — Frierson (1927)
Anodonta brooksiana — van der Schalie (1938)
Anodonta (Pyganodon) brooksiana — Haas (1969)
Anodonta (Pyganodon) cataracta fragilis — R.I. Johnson (1970), Kat (1983)
Anodonta cataracta fragilis — R.I. Johnson (1980), Kat (1983), Kat & Davis (1984), Turgeon et al. (1988)
Anodonta fragilis — Hoeh & Burch (1989)
Pyganodon fragilis — Hoeh (1990), Williams et al. (1993), Hoeh et al. (1995), Hoeh et al. (1996), ..., Krebs et al. (2019), Beauchamp et al. (2020), FMCS (2021), Graf & Cummings (2021)