Medionidus walkeri (Wright, 1897)

Suwannee moccasinshell



Taxonomy & Nomenclature



Conservation Status

Last record: 1996

Rediscovered in 2012

IUCN RedList status: Critically Endangered



Suwannee River basin, USA (southeastern)


Biology & Ecology










Cummings, K. & Cordeiro, J. 2012. Medionidus walkeri. The IUCN Red List of Threatened Species 2012: e.T12930A510583. Downloaded on 14 November 2016.

Deyrup, M. and Franz, R. (1994). Rare and Endangered Biota of Florida, Volume IV: Invertebrates. University Press of Florida, Gainesville, Florida, USA.

Graf, Daniel L. and Cummings, Kevin S. (2021). A ‘big data’ approach to global freshwater mussel diversity (Bivalvia: Unionoida), with an updated checklist of genera and species. Journal of Molluscan Studies 87(1): eyaa034.

Haag, Wendell R. (2009). Past and future patterns of freshwater mussel extinctions in North America during the Holocene, pp. 107-128. In: Turvey, Samuel T. (ed.). Holocene Extinctions. Oxford, UK & New York, USA: Oxford University Press. xii + 352 pp.

Heard, W. H. (1979). Identification Manual of the Freshwater Clams of Florida. State of Florida Department of Environmental Regulation.

Johnson, Nathan A., Mcleod, John M., Holcomb, Jordan, Rowe, Matthew and Williams, James D. (2016). Early life history and spatiotemporal changes in distribution of the rediscovered Suwannee moccasinshell Medionidus walkeri (Bivalvia: Unionidae). Endangered Species Research 31: 163-175.

Williams, James D., Bogan, Arthur E., Butler, Robert S., Cummings, Kevin S., Garner, Jeffrey T., Harris, John L., Johnson, Nathan A. and Watters, G. Thomas. (2017). A revised list of the freshwater mussels (Mollusca: Bivalvia: Unionida) of the United States and Canada. Freshwater Mollusk Biology and Conservation 20: 33-58.


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