MUSSELpdb

(new name for Alasmidonta Say, 1818; renamed Anelasmodon Agassiz, 1846)
‘Say’ of Authors.
Say, 1819. Nich. Encyc. 4: [18].
Barnes, 1823. Amer. J. Sci. 6 (1-2): 275.
Say, 1825. Jour. Acad. Nat. Sci. 5(3-4): 131.
Férussac, 1827. Bull. Sci. Nat. et Géol. 10: 417.
Hildreth, 1828. Amer. J. Sci. 14: 289.
Lea, 1829. Trans. Amer. Phil. Soc. 3 [O. 1]: 421.
Menke, 1830. Syn. Method. Moll.: 106.
Ferussac, 1835. Mag. Zool. 5(59-60): 25.
Lea, 1836. Synopsis Fam. Naiades: 43.
Schlüter, 1838. Kurzgef. Syst. Verz. Conch. Samml.: 32.
Agassiz, 1852. Arch. Naturg. 18(1): 46.
Adams & Adams, 1857. Gen. Rec. Moll. 2(31-32): 499.
Vest, 1866. Verh. Mitth. Siebenbürg. Ver. Naturw. (17): 197.
Sowerby, 1868. Conch. Icon. 16: pl. 1.
Type species: Unio undulata Say, 1817 = Alasmidonta undulata

Monodonta Say, 1817

(homonym of Lamarck, 1801 [Gastrop.]; renamed Alasmidonta Say, 1818)
Say, 1817. Nich. Encyc. 2: [13].
Type species: Unio undulata Say, 1817 (orig. desig.) = Alasmidonta undulata

Alasmidonta Say, 1818

(new name for Monodonta Say, 1817; renamed Alasmodonta Say, 1819)
Say, 1818. Jour. Acad. Nat. Sci. 1(11): 459.
Say, 1819. Nich. Encyc. 4: unpaginated.
Type species: Unio undulata Say, 1817 = Alasmidonta undulata

Alasmodon Thompson, 1820

(error for Alasmodonta Say, 1819; renamed Anelasmodon Agassiz, 1846)
Thompson, 1820. Ann. Phil. 16: 116.
‘Say’ Sowerby, 1824. Zool. Jour. 1: 54.
‘Say’ Sowerby, 1839. Conch. Man.: 2.
‘Say’ Swainson, 1840. Treat. Malacol.: 262, 264, 266, 269-274, 278-279, 290, 382.
De Kay, 1843. Zool. New York 5: 196.
‘Say’ Brown, 1844. Ill. Rec. Conch. Gr. Brit. & Ireland: 83.
‘Say’ Woodward, 1871. Man. Moll: 433.
Type species: Unio undulata Say, 1817 = Alasmidonta undulata

Alasmisodonta Blainville, 1825

(error for Alasmidonta Say, 1818)
‘Say’ Blainville, 1825. Manuel Malacol. et Conch.: 630, 639.
Type species: Unio undulata Say, 1817 = Alasmidonta undulata

Alismadon Fleming, 1828

(error for Alasmodon Thompson, 1820)
Fleming, 1828. Hist. Brit. Anim.: 408.
Type species: Unio undulata Say, 1817 = Alasmidonta undulata

Decurambis Rafinesque, 1831

Rafinesque, 1831. Continuation: 4.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 79.
Type species: Decurambis scriptum Rafinesque, 1831 (sub. desig. by Ortmann & Walker, 1922: 38) = Alasmidonta marginata

Alasmadonta Jay, 1835

(error for Alasmidonta Say, 1818)
Jay, 1835. Cat. Rec. Shells: 18.
Type species: Unio undulata Say, 1817 = Alasmidonta undulata

Uniopsis Swainson, 1840

Swainson, 1840. Treat. Malacol.: 288, 290, 382.
Type species: Uniopsis mytiloides Swainson, 1840 (sub. desig. by Gray, 1847: 196) = Alasmidonta undulata

Anelasmodon Agassiz, 1846

(new name for Alasmodonta Say, 1819; new name for Alasmodon Thompson, 1820)
Agassiz, 1846. Nomencl. Zool. Index Univ.: 22.
Type species: Unio undulata Say, 1817 = Alasmidonta undulata

Anelasmodonta Herrmannsen, 1846

Herrmannsen, 1846. Ind. Gener. Malacol. 1: 27, 54.
Type species: Unio undulata Say, 1817 = Alasmidonta undulata

Alasmedonta Gray, 1847

(error for Alasmidonta Say, 1818)
‘Say’ Gray, 1847. Proc. Zool. Soc. London 15: 196.
Type species: Unio undulata Say, 1817 = Alasmidonta undulata

Alasmesodonta Gray, 1847

(error for Alasmisodonta Blainville, 1825)
‘Blainv.’ Gray, 1847. Proc. Zool. Soc. London 15: 196.
Type species: Unio undulata Say, 1817 = Alasmidonta undulata

Decarambis Paetel, 1875

(error for Decurambis Rafinesque, 1831)
‘Rafnq.’ Paetel, 1875. Fam. Gatt. Moll.: 67.
Type species: Decurambis scriptum Rafinesque, 1831 = Alasmidonta marginata

Unionopsis Meek, 1876

(error for Uniopsis Swainson, 1840)
Meek, 1876. Rept. U.S. Geol. Surv. Terr. (Hayden) 9: 113.
Type species: Uniopsis mytiloides Swainson, 1840 = Alasmidonta undulata

Rugifera Simpson, 1900

(intro'd as sub-gen. of Alasmidonta Say, 1818)
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 670.
Simpson, 1914. Descr. Cat. Naiades: 504.
Type species: Alasmidonta marginata Say, 1818 (orig. desig.) = Alasmidonta marginata

Bullella Simpson, 1900

(intro'd as sub-gen. of Alasmidonta Say, 1818)
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 672.
Simpson, 1914. Descr. Cat. Naiades: 508.
Type species: Margaritana arcula Lea, 1838 (orig. desig.) = Alasmidonta arcula

Jugosus Simpson, 1914

(intro'd as sub-gen. of Strophitus Rafinesque, 1820)
Simpson, 1914. Descr. Cat. Naiades: 357.
Type species: Strophitus wrightianus Walker, 1901 (original designation) = Alasmidonta wrightiana

Decumrambis Modell, 1942

(error for Decurambis Rafinesque, 1831)
‘Rafinesque’ Modell, 1942. Arch. Moll. 74(5/6): 180.
Type species: Decurambis scriptum Rafinesque, 1831 = Alasmidonta marginata

Iugosus Modell, 1964

(error for Jugosus Simpson, 1914)
‘Simpson’ Modell, 1964. Arch. Moll. 93: 91.
Type species: Strophitus wrightianus Walker, 1901 = Alasmidonta wrightiana

Alasmidens Clarke, 1981

(intro'd as sub-gen. of Alasmidonta Say, 1818)
Clarke, 1981. Smithson. Contrib. Zool. (326): 35.
Type species: Alasmidonta mccordi Athearn, 1964 (orig. desig.) = Alasmidonta mccordi

Taxonomic History (since 1900)

The Taxonomic History lists the ways authors have classified the species currently assigned to Alasmidonta, since 1900.

Alasmidonta (s.s.) — Simpson (1900), Simpson (1914), Frierson (1927), Haas (1969), Haas (1969), R.I. Johnson (1970), Burch (1975), Clarke (1981), Graf & Cummings (2007), Williams et al. (2014), Campbell & Lydeard (2026)
Alasmidonta (Rugifera) — Simpson (1900), Ortmann (1909), Simpson (1914)
Alasmidonta (Bullella) — Simpson (1900), Simpson (1914), Frierson (1927), Haas (1969), Haas (1969), Campbell & Lydeard (2026)
Unio (Margaritana) — Call (1900)
Alasmidonta — Fox (1901), Ortmann (1909), Ortmann (1909), Ortmann (1909), Ortmann (1910), ... Wang et al. (2025), Chen et al. (2025), Campbell & Lydeard (2026), Wu et al. (2026), Wu et al. (2026)
Strophitus (sec. Jugosus) — Simpson (1914)
Unio — de Gregorio (1914)
Alasmidonta (Decurambis) — Ortmann (1918), Ortmann & Walker (1922), Ortmann (1924), Ortmann (1925), F.C. Baker (1928), Haas (1969), Haas (1969), R.I. Johnson (1970), Clarke (1981), Graf & Cummings (2007), Campbell & Lydeard (2026)
Decurambis — Frierson (1927)
Strophitus (Jugosus) — Frierson (1927), Haas (1969), Haas (1969)
Alasmodonta — Thiele (1934)
Alasmodonta (sec. Bullella) — Thiele (1934)
Alasmodonta (sec. Decurambis) — Thiele (1934)
Strophitus — Thiele (1934)
Alasmidonta (Alasmidens) — Clarke (1981), Graf & Cummings (2007)