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Species & Genus Richness by
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Species Richness & Endemism by
Geography

Data last updated
Mon 1 Dec 2025

Bivalvia | Unionoida | Unionoidea | Unionidae | Ambleminae | Lampsilini

genus Medionidus Simpson, 1900: species

1 available nominal genus synonym (2 total synonyms) | cladomics

Included Species

Decorative image of a representative of Medionidus acutissimus

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

Decorative image of a representative of Medionidus parvulus

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

Decorative image of a representative of Medionidus penicillatus

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

Decorative image of a representative of Medionidus simpsonianus

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

Decorative image of a representative of Medionidus walkeri

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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