Anodonta impura Say, 1829
Say, 1829. New Harm. Dissem. 2(23): 355, sp. 4.
Say, 1858. [in] Binney, Compl. Writings T. Say: 139-140.

Anodonta (s.s.) chalcoensis — Martens (1900)
Anodonta henryana — Simpson (1900)
Anodonta cygnea impura — Hannibal (1912)
Anodonta impura — Simpson (1914), Contreras-Arquieta (2000), Graf & Cummings (2007), Bogan (2010), Cummings & Graf (2010), IUCN (2011), Graf & Cummings (2021), Czaja et al. (2023), Whelan et al. (2023), Perkins et al. (2025)
Anodonta (s.s.) impura — Frierson (1927)
Anodonta marginata impura — Modell (1945)
Anodonta (Brachyanodon) impura — Haas (1969)
Anodonta impure [sic] — Galal-Khallaf et al. (2024)
Brachyanodon impura — Cummings et al. (2025)
Brachyanodon impurus — Campbell & Lydeard (2026)

Unio (Anodonta) coarctata Anton, 1839
Anton, 1839. Verz. Conchylien: 16, no. 583.

Anodonta coarctata — Simpson (1900), Simpson (1914), Haas (1929), Contreras-Arquieta (2000)
Anodonta (s.s.) coarctata — Martens (1900)
Anodonta cygnea impura — Hannibal (1912)
Anodonta (s.s.) impura — Frierson (1927)
Anodonta (Brachyanodon) impura — Haas (1969)
Anodonta (Brachyanodon) coarctata — Haas (1969)
Brachyanodon impura — Cummings et al. (2025)

Anodon glabrus Sowerby, 1870
‘Valenciennes’ Sowerby, 1870. Conch. Icon. 17: pl. 25, sp. 97.

Glabaris (s.s.) inæquivalvis [sic] — Simpson (1900)
Anodonta (s.s.) exilior — Martens (1900)
Anodontites (s.s.) inæquivalvis [sic] — Simpson (1914)
Anodonta (s.s.) impura — Frierson (1927)
Anodonta (Brachyanodon) impura — Haas (1969)
Brachyanodon impura — Cummings et al. (2025)

Anodonta exilior Lea, 1871
Lea, 1871. Proc. Acad. Nat. Sci. 23: 188.
Lea, 1874. Jour. Acad. Nat. Sci. 8 [O. 13]: 24 [28], pl. 7, fig. 21.
Type(s): LECTOTYPE USNM_86730 (by Johnson & Baker, 1973: 154), Mexico.

Anodonta exilior — Simpson (1900), Simpson (1914), Contreras-Arquieta (2000)
Anodonta (s.s.) exilior — Martens (1900)
Anodonta cygnea impura — Hannibal (1912)
Anodonta (s.s.) impura — Frierson (1927)
Anodonta (Brachyanodon) impura — Haas (1969)
Brachyanodon impura — Cummings et al. (2025)

Anodonta viridana Clessin, 1876
Clessin, 1876. Conchyl. Cab.: 226, pl. 75, fig. 5.

Glabaris (s.s.) inæquivalvis [sic] — Simpson (1900)
Anodonta (s.s.) exilior — Martens (1900)
Anodontites (s.s.) inæquivalvis [sic] — Simpson (1914)
Anodonta (s.s.) impura — Frierson (1927)
Anodonta (Brachyanodon) impura — Haas (1969)
Brachyanodon impura — Cummings et al. (2025)

Anodonta chalcoensis Crosse & Fischer, 1893
Crosse & Fischer, 1893. J. de Conch. 41: 110.
Fischer & Crosse, 1894. Miss. Sci. Mexique, Rech. Zool. 2(15): 522, pl. 64, figs. 7-7a.
Type(s): SYNTYPE MNHN_IM-2000-1656, Mexique, Lac de Chalco.

Anodonta exilior — Simpson (1900), Simpson (1914)
Anodonta (s.s.) chalcoensis — Martens (1900)
Anodonta cygnea impura — Hannibal (1912)
Anodonta (s.s.) impura — Frierson (1927)
Anodonta (Brachyanodon) impura — Haas (1969)
Brachyanodon impura — Cummings et al. (2025)

Anodonta chapalensis Crosse & Fischer, 1893
Crosse & Fischer, 1893. J. de Conch. 40: 295.
Fischer & Crosse, 1894. Miss. Sci. Mexique, Rech. Zool. 2(15): 518, pl. 64, figs. 8-11.
Type(s): SYNTYPES MNHN_IM-2000-1657, Mexique, Lac de Tchapala.

Anodonta coarctata — Simpson (1900), Simpson (1914)
Anodonta (s.s.) coarctata — Martens (1900)
Anodonta cygnea impura — Hannibal (1912)
Anodonta (s.s.) impura — Frierson (1927)
Anodonta chapalensis — Haas (1929), Thiele (1934), Contreras-Arquieta (2000)
Anodonta (Brachyanodon) impura — Haas (1969)
Anodonta (Brachyanodon) coarctata — Haas (1969)
Brachyanodon impura — Cummings et al. (2025)
Brachyanodon impurus — Campbell & Lydeard (2026)

Anodonta nuttalliana lignitica Cooper, 1894
Cooper, 1894. Bull. Calif. St. Mining Bur. (4): 55, pl. 5, fig. 58.
(intro'd as intra-sp. of Anodonta nuttalliana Lea, 1838)

Anodonta cygnea impura — Hannibal (1912)
Anodonta nuttalliana lignitica — Henderson (1935)

Anodonta richardsoni Martens, 1900
Martens, 1900. Biol. Centr.-Amer., Moll.: 529, pl. 41, figs. 1-2a.
Type(s): SYNTYPES ZMB_108856, Rio Ameca, Prov. Jalisco, Mexico.

Anodonta (s.s.) richardsoni — Martens (1900), Frierson (1927)
Anodonta richardsoni — Simpson (1914), Haas (1929)
Anodonta (Brachyanodon) impura — Haas (1969)
Brachyanodon impura — Cummings et al. (2025)

Anodonta impure Galal-Khallaf et al., 2024
Galal-Khallaf et al., 2024. Egypt. J. Zool. 81: 22.
(error for Anodonta impura Say, 1829)

Anodonta cygnea impura Hannibal, 1912
Hannibal, 1912. Proc. Malac. Soc. London 10(2): 125.
(reference to Anodonta impura Say, 1829)

— Henderson (1935)

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

Anodonta (s.s.) impura — Frierson (1927)