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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 | ... | Unionoidea | Unionidae | Unioninae | Anodontini | Alasmidontina

genus Simpsonaias Frierson, 1914: synonymy
     1 Recent valid species (1 total species)

Simpsoniconcha Frierson, 1914
Frierson, 1914. Nautilus 28: 40.
(new name for Simpsonaias Frierson, 1914)

Simpsonaias Frierson, 1914
Frierson, 1914. Nautilus 28: 7.
(renamed Simpsoniconcha Frierson, 1914)
Type species: Alasmodonta ambigua Say, 1825 (orig. desig.) = Simpsonaias ambigua

Hemilastena Simpson, 1900
‘Agassiz’
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 673.
‘Agassiz’ Simpson, 1914. Descr. Cat. Naiades: 323.
(reference to Hemilastena Agassiz, 1852)
Type species: Alasmodonta ambigua Say, 1825 (orig. desig.) = Simpsonaias ambigua

Simpsonais Whelan et al., 2023
Whelan et al., 2023. Zool. J. Linn. Soc. 198(2): Table S1.
(error for Simpsonaias Frierson, 1914)

Taxonomic History (since 1900)

HemilastenaSimpson (1900), Simpson (1914)
Unio (Margaritana)Call (1900)
SimpsoniconchaWalker (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)
SimpsonaiasHaas (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]Whelan et al. (2023)

 
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