| 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 | Lampsilini genus Medionidus Simpson, 1900: species
1 available nominal genus synonym (2 total synonyms) | cladomics  Medionidus acutissimus (Lea, 1831)
syonymy (3 available, 5 total) | specimens (1 + 1 Genbank voucher)
Range: Mobile and Choctawhatchee basins, eastern Gulf Coastal Plain, USA. (North America)
Genbank sequences: 16S, 5.8S, COI, ITS1, ND1
IUCN Red List: Endangered A1ce+2ce
NatureServe: G2
other links: MolluscaBase
|  Medionidus conradicus (Lea, 1834)
syonymy (2 available, 6 total) | specimens (1 + 4 Genbank vouchers)
Range: Tennessee and Cumberland rivers, USA. (North America)
Genbank sequences: 16S, 28S, 5.8S, COI, ITS1, ND1
IUCN Red List: Lower Risk/near threatened
NatureServe: G3
other links: MolluscaBase
|  Medionidus parvulus (Lea, 1860)
syonymy (1 available, 1 total) | specimens (1)
Range: Coosa River, Alabama, Georgia, and Tennessee, USA. (North America)
IUCN Red List: Endangered B1ab(i,ii,iii,iv)
NatureServe: G1
other links: MolluscaBase
|  Medionidus penicillatus (Lea, 1857)
syonymy (2 available, 2 total) | specimens (2 + 1 Genbank voucher)
Range: Apalachicola and adjacent rivers, Alabama, Georgia, and Florida, USA. (North America)
Genbank sequences: COI, ND1
IUCN Red List: Critically Endangered A1ce+2ce
NatureServe: G2
other links: MolluscaBase
|  Medionidus simpsonianus Walker, 1905
syonymy (1 available, 1 total) | specimens (1)
Range: Endemic to the Ochlockonee Basin, eastern Gulf Coastal Plain, Florida and Georgia. (North America)
Genbank sequences: ND1
IUCN Red List: Critically Endangered A1ce
NatureServe: G1
other links: MolluscaBase
|  Medionidus walkeri (B.H. Wright, 1897)
syonymy (1 available, 1 total) | specimens (2)
Range: Suwannee and Hillsborough rivers, Florida. (North America)
IUCN Red List: Critically Endangered B1ab(i,ii,iii,iv)+2ab(i,ii,iii,iv)
NatureServe: G1
other links: MolluscaBase
| Medionidus senectus (White, 1877) (Cretaceous)
syonymy (1 available, 1 total) | specimens (0)
Range: Cretaceous, North America.
other links: MolluscaBase |
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