Medionidus walkeri

Suwannee Moccasinshell

FWS Focus


The Suwannee moccasinshell is a small mussel that rarely exceeds 50 millimeters (2.0 inches) in length. Its shell is oval in shape with corrugations extending along the posterior ridge. The corrugations are sometimes faint. The exterior of the shell is greenish yellow to brown with green rays of varying width and intensity in young individuals and olive brown to brownish black with rays often obscured in mature individuals. The sexes can be distinguished, with females being smaller and longer than males. The Suwannee moccasinshell is easily distinguished from all other mussels in the Suwannee River Basin due to its oval outline and sculpture on the posterior slope.

Scientific Name

Medionidus walkeri
Common Name
Suwannee moccasinshell
FWS Category

Location in Taxonomic Tree

Identification Numbers



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