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Page last updated
Wed 1 October 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!

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Bivalvia | Unionoida | Unionoidea | Unionidae | Unioninae | Anodontini | Alasmidontina

genus Utterbackiana Frierson, 1927: synonymy
     5 Recent freshwater species (5 total species)

Nayadina de Gregorio, 1914
de Gregorio, 1914. Il Nat. Siciliano 2: 64.
(homonym of Munier-Chalmas, 1864 [Mallaeidae]; intro'd as sub-gen. of Anodonta Lamarck, 1799)
Type species: Anodonta (Nayadina) venusta de Gregorio, 1914 (monotypy) = Utterbackiana suborbiculata

Utterbackiana Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: 17.
(intro'd as sub-gen. of Anodonta Lamarck, 1799)
Type species: Anodonta suborbiculata Say, 1831 (orig. desig.) = Utterbackiana suborbiculata

Nayadina Haas, 1969
‘de Gregorio’ Haas, 1969. Das Tierreich 88: 359.
(reference to Nayadina de Gregorio, 1914)
Type species: Anodonta suborbiculata Say, 1831 ([see comments]) = Utterbackiana suborbiculata

Taxonomic History (since 1900)

AnodontaSimpson (1900), Ortmann (1909), Simpson (1914), Thiele (1934), Clench & Turner (1956), ... Smith et al. (2018), Marshall et al. (2018), Whelan et al. (2023), Galal-Khallaf et al. (2024), Perkins et al. (2025)
Unio (Anodonta)Call (1900)
Anodonta (Nayadina)de Gregorio (1914), Haas (1969)
LastenaUtterback (1915), Modell (1945)
Anodonta (Pyganodon)Frierson (1927), Haas (1969), R.I. Johnson (1970), Kat (1983)
Anodonta (Utterbackiana)Frierson (1927), Haas (1969)
Anodonta (Lastena)Frierson (1927), Haas (1969)
PyganodonModell (1945), Graf & Cummings (2007), Watters et al. (2009), Cummings & Graf (2010), Jones (2015)
UtterbackianaModell (1945), Williams et al. (2017), Graf & Cummings (2021), FMCS (2021), Bieler (2021), Hopper et al. (2023), Whelan et al. (2023), FMCS (2025), Perkins et al. (2025)
Anodonta (Utterbackia)R.I. Johnson (1970), R.I. Johnson (1972), Heard (1975), R.I. Johnson (1980), Kat (1983)
UtterbackiaGraf & Cummings (2007), Cummings & Graf (2010)

 
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