Anodonta angulata Lea, 1838
Lea, 1838. Trans. Amer. Phil. Soc. 6 [O. 2]: 97, pl. 16, fig. 52.
Type(s): HOLOTYPE (MONOTYPY) USNM_86759, Lewis R., Ore.

Gonidea angulata — Simpson (1900), Hannibal (1912), Simpson (1914), Frierson (1927), Thiele (1934), ... Jeratthitikul et al. (2024), Dai et al. (2024), Jeratthitikul et al. (2025), Dai et al. (2025), FMCS (2025)

Anodon feminalis Gould, 1850
Gould, 1850. Proc. Boston Soc. Nat. Hist. 3: 293.
Gould, 1852. U.S. Explor. Exped. 12: 436, figs. 547-547b.
Type(s): HOLOTYPE USNM_5932, Oregon.

Gonidea angulata — Simpson (1900), Hannibal (1912), Simpson (1914), Frierson (1927), Haas (1969), Burch (1975), IUCN (2016)

Anodonta randalli Trask, 1854
Trask, 1854. Proc. Calif. Acad. Sci. 1: 28.

Gonidea angulata — Simpson (1900), Hannibal (1912), Simpson (1914), Frierson (1927), Haas (1969), Haas (1969), Burch (1975), IUCN (2016), Lopes-Lima et al. (2017), Graf & Cummings (2021), Lopes-Lima et al. (2021)

Anodon biangulata Sowerby, 1869
Sowerby, 1869. Conch. Icon. 17: pl. 23, sp. 88, figs. 88a-b.

Gonidea angulata — Simpson (1900), Hannibal (1912), Simpson (1914), Frierson (1927), Haas (1969), Burch (1975), IUCN (2016)

Anodonta angulata var. subangulata Hemphill, 1891
Hemphill, 1891. Zoe 1(11): 325, pl. 10, figs. 1-2.
(intro'd as intra-sp. of Anodonta angulata Lea, 1838)

— Simpson (1900)
Gonidea angulata haroldiana — Hannibal (1912)
Gonidea angulata var. subangulata — Simpson (1914)
Gonidea angulata-subangulata — Frierson (1927)
Gonidea angulata — Haas (1969)

Margaritana subangulata Cooper, 1894
Cooper, 1894. Proc. Calif. Acad. Sci. 4: 166.
(homonym of Anodonta angulata var. subangulata Hemphill, 1891)

Gonidea (Limnobasilissa) angulata subangulata — Hannibal (1912)
Gonidea coalingensis cooperi — Henderson (1935)
Gonidea coalingensis — Modell (1957)

Gonidea angulata var. haroldiana Dall, 1908
Dall, 1908. Smithsonian Misc. Coll. 50: 499.
(intro'd as intra-sp. of Anodonta angulata Lea, 1838)
Type(s): HOLOTYPE USNM_110596A, Hannibal Ranch, near San Jose, California.

Gonidea angulata haroldiana — Hannibal (1912)
Gonidea angulata var. subangulata — Simpson (1914)
Gonidea angulata var. haroldiana — Ortmann (1916)
Gonidea angulata-haroldiana — Frierson (1927)
Gonidea angulata — Haas (1969)

Gonidea coalingensis Arnold, 1909
Arnold, 1909. Bull. U.S. Geol. Surv. 396: 47, pl. 30, fig. 11.

Gonidea (Limnobasilissa) angulata subangulata — Hannibal (1912)
Gonidea coalingensis coalingensis — Henderson (1935)
Gonidea coalingensis — Modell (1957)

Gonidea coalingensis cooperi Arnold, 1909
Arnold, 1909. Bull. U.S. Geol. Surv. 396: 48.
(intro'd as intra-sp. of Gonidea coalingensis Arnold, 1909)

Gonidea (Limnobasilissa) angulata subangulata — Hannibal (1912)
Gonidea coalingensis cooperi — Henderson (1935)
Gonidea coalingensis — Modell (1957)

Anodon randalii Conrad, 1857
‘Trask’ Conrad, 1857. Proc. Acad. Nat. Sci. 9: 165.
‘Trask’ Lopes-Lima et al., 2020. MPE 146: Appendix 1.
(error for Anodonta randalli Trask, 1854)