| 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 | Ambleminae | Quadrulini | Quadrulina genus Quadrula Rafinesque, 1820: species
3 available nominal genus synonyms (7 total synonyms) | cladomics  Quadrula couchiana (Lea, 1860)
syonymy (1 available, 2 total) | specimens (23)
Range: Rio Grande, western Gulf Coastal Plain, south into northern Mexico. Extinct. (North America)
IUCN Red List: Critically Endangered A1c
NatureServe: GH
other links: MolluscaBase
|  Quadrula fragosa (Conrad, 1836)
syonymy (1 available, 4 total) | specimens (1 + 18 Genbank vouchers)
Range: Upper Mississippi and Ohio rivers, USA. (North America)
Genbank sequences: 5.8S, COI, ITS1, ND1, other, SRA
IUCN Red List: Critically Endangered A1c
NatureServe: G1
other links: MolluscaBase
|  Quadrula nobilis (Conrad, 1854)
syonymy (1 available, 2 total) | specimens (1 + 10 Genbank vouchers)
Range: Mobile Basin west to Texas, Gulf Coastal Plain, and in the Interior Basin north to Kentucky, USA. (North America)
Genbank sequences: 16S, COI, ND1, SRA
NatureServe: G4 (Tritogonia nobilis)
other links: MolluscaBase
|  Quadrula quadrula (Rafinesque, 1820)
syonymy (13 available, 25 total) | specimens (14 + 160 Genbank vouchers)
Range: Widespread in the Interior, Nelson and Great Lakes basins, as well as the western Gulf Coastal Plain, North America. (North America)
Genbank sequences: 16S, 28S, 5.8S, COI, COI M-type, COII, COII M-type, ITS1, mtGenome, mtGenome M-type, ND1, other, SRA
IUCN Red List: Least Concern (Quadrula rumphiana), Least Concern
NatureServe: G5
other links: MolluscaBase
|  Quadrula verrucosa (Rafinesque, 1820)
syonymy (8 available, 11 total) | specimens (4 + 9 Genbank vouchers)
Range: Widespread in the Interior and Gulf Coastal Plain, eastern North America. (North America)
Genbank sequences: 16S, 28S, 5.8S, COI, ITS1, ND1, other, SRA
NatureServe: G4 (Tritogonia verrucosa)
other links: MolluscaBase
| Quadrula cylindricoides (Whitfield, 1907) (Cretaceous)
syonymy (1 available, 1 total) | specimens (0)
other links: MolluscaBase | Quadrula natosini (McLearn, 1929) (Cretaceous)
syonymy (1 available, 1 total) | specimens (0) | Quadrula primaevus (White, 1877) (Cretaceous)
syonymy (1 available, 1 total) | specimens (0)
Range: Cretaceous, North America.
other links: MolluscaBase | Quadrula subprimaevus (Dyer, 1930) (Cretaceous)
syonymy (1 available, 1 total) | specimens (0)
Range: Cretaceous, North America. |
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