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Page last updated
Thu 3 September 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 | Ambleminae | Popenaiadini

genus Nephronaias Crosse & Fischer, 1894: synonymy
     19 Recent valid species (19 total species)

Nephronaias Fischer & Crosse, 1894
Fischer & Crosse, 1894. Miss. Sci. Mexique, Rech. Zool. 2(15): 556.
(intro'd as sub-gen. of Unio Retzius, 1788)
Type species: Unio plicatulus Küster, 1856 (orig. desig.) = Nephronaias aztecorum

Caenonaias Fischer & Crosse, 1894
Fischer & Crosse, 1894. Miss. Sci. Mexique, Rech. Zool. 2(15): 556 [as ‘Cænonaias’].
(intro'd as sub-gen. of Unio Retzius, 1788)
Type species: Unio aeruginosus Morelet, 1849 (orig. desig.) = Nephronaias aeruginosa

Leptonaias Fischer & Crosse, 1894
Fischer & Crosse, 1894. Miss. Sci. Mexique, Rech. Zool. 2(15): 557.
(intro'd as sub-gen. of Unio Retzius, 1788)
Type species: Unio ravistellus Morelet, 1849 (orig. desig.) = Nephronaias ravistella

Coenonaias Fischer & Crosse, 1894
‘Crosse & Fischer’ of Authors.
Fischer & Crosse, 1894. Miss. Sci. Mexique, Rech. Zool. 2(16): 596.
Modell, 1964. Arch. Moll. 93: 90.
(error for Caenonaias Fischer & Crosse, 1894)

Nephronajas Ortmann, 1912
‘Crosse & Fischer’ of Authors.
Ortmann, 1912. Ann. Carnegie Mus. 8: 324.
Baker, 1916. Tech. Publ. New York State Coll. Forestry (4): 75.
(error for Nephronaias Fischer & Crosse, 1894)

Nepronaias Simpson, 1900
‘Crosse & Fischer’ Simpson, 1900. Proc. U.S. Nat. Mus. 22: 591.
(error for Nephronaias Fischer & Crosse, 1894)

Taxonomic History (since 1900)

Lampsilis (Proptera)Simpson (1900)
NephronaiasSimpson (1900), Ihering (1901), Bartsch (1906), Simpson (1914), Frierson (1917), ... Inoue et al. (2020), Graf & Cummings (2021), Czaja et al. (2023), Freeman et al. (2025), Cummings et al. (2025)
Unio (sec. Elliptio)Simpson (1900), Simpson (1914)
Unio (Arotonaias)Martens (1900)
Unio (Sphenonaias)Martens (1900)
Unio (Nephronaias)Martens (1900)
Unio (Simonaias)Martens (1900)
Unio (Elliptio)Martens (1900)
LampsilisPilsbry (1910)
Plagiola (Arotonaias)Simpson (1914)
ElliptioOrtmann (1921)
Elliptio (Nephronaias)Frierson (1927), Haas (1929)
Elliptio (Sphenonaias)Frierson (1927)
Elliptio (Popenaias)Frierson (1927)
Elliptio (Barynaias)Frierson (1927), Haas (1929)
Lampsilis (Disconaias)Frierson (1927), Haas (1929)
Elliptio (sec. Nephronaias)Thiele (1934)
PlagiolaGoodrich & van der Schalie (1937)
Nephronaias (s.s.)Haas (1969), Haas (1969), Johnson (1981)
Nephronaias (Popenaias)Haas (1969)
Nephronaias (Sphenonaias)Haas (1969)
BarynaiasHaas (1969), Graf & Cummings (2007), Bogan (2010), Graf & Cummings (2021), Czaja et al. (2023)
PopenaiasHowells et al. (1996), Graf & Cummings (2007), Bogan (2010), Inoue et al. (2020), Graf & Cummings (2021), Czaja et al. (2023)
SphenonaiasGraf & Cummings (2007), Bogan (2010), Graf & Cummings (2021)

 
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