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Page last updated
Thu 17 July 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!


Bivalvia | ... | Unioninae | Anodontini | Alasmidontina | Simpsonaias

species Simpsonaias ambigua (Say, 1825): synonymy
     1 specimen + 1 Genbank voucher

Alasmodonta ambigua Say, 1825
Say, 1825. Jour. Acad. Nat. Sci. 5(3-4): 131.
Say, 1858. [in] Binney, Compl. Writings T. Say: 118.

Hemilastena ambiguaSimpson (1900), Simpson (1914)
Simpsoniconcha ambiguaWalker (1918), Frierson (1927), F.C. Baker (1928), Thiele (1934), Stansbery (1970), Burch (1975), Heard (1975), Gordon et al. (1979), Mathiak (1979), R.I. Johnson (1980), Mackie et al. (1980)
Simpsonaias ambiguaHaas (1969), Haas (1969), Oesch (1984), Clarke (1985), Turgeon et al. (1988), ... Lopes-Lima et al. (2020), Graf & Cummings (2021), FMCS (2021), Jeratthitikul et al. (2022), Hopper et al. (2023)
Simpsonais [sic] ambiguaWhelan et al. (2023)

Unio hildrethianus Lea, 1834
Lea, 1834. Trans. Amer. Phil. Soc. 5 [O. 1]: 36 [148], pl. 3, fig. 8.
Type(s): FIGURED SYNTYPE USNM_122252, Ohio R., Louisville, Ky.

Hemilastena ambiguaSimpson (1900), Simpson (1914)
Unio (Margaritana) hildrethianaCall (1900)
Simpsoniconcha ambiguaFrierson (1927), F.C. Baker (1928)
Simpsonaias ambiguaHaas (1969), Clarke (1985), Strayer & Jirka (1997), Parmalee & Bogan (1998), Watters et al. (2009)

Alasmidonta dubia Ferussac, 1835
‘Say’ Ferussac, 1835. Mag. Zool. 5: 26.
(error for Alasmodonta ambigua Say, 1825)

Hemilastena ambiguaSimpson (1900), Simpson (1914)
Simpsoniconcha ambiguaFrierson (1927)
Simpsonaias ambiguaHaas (1969), Clarke (1985), Parmalee & Bogan (1998), Watters et al. (2009)

Unio hildreihianus Frierson, 1914
‘Lea’ Frierson, 1914. Nautilus 28: 7.
(error for Unio hildrethianus Lea, 1834)

Taxonomic History (since 1900)

Hemilastena ambiguaSimpson (1900), Simpson (1914)
Unio (Margaritana) hildrethianaCall (1900)
Simpsoniconcha ambiguaWalker (1918), Frierson (1927), F.C. Baker (1928), Thiele (1934), Stansbery (1970), Burch (1975), Heard (1975), Gordon et al. (1979), Mathiak (1979), R.I. Johnson (1980), Mackie et al. (1980)
Simpsonaias ambiguaHaas (1969), Haas (1969), Oesch (1984), Clarke (1985), Turgeon et al. (1988), ... Lopes-Lima et al. (2020), Graf & Cummings (2021), FMCS (2021), Jeratthitikul et al. (2022), Hopper et al. (2023)
Simpsonais [sic] ambiguaWhelan et al. (2023)

 
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