Alasmidonta mccordi Athearn, 1964

Coosa elktoe



Taxonomy & Nomenclature

Synonym/s: Alasmidonta maccordi Athearn, 1964


Conservation Status


Last record: 1964 or prior

IUCN RedList status: Extinct



Coosa River, St. Clair County, Alabama, USA


Known only from a single specimen collected from the Coosa River, within the St. Clair County boundary.


Biology & Ecology










Original scientific description:

Athearn, H. D. (1964). Three new unionids from Alabama and Florida and a note on Lampsilis jonesi. The Nautilus 77(4): 134-139.


Other references:

Anonymous. (2008). "Alabama Mussel List" on (Accessed 1 May, 2011).

Bogan, A.E., Huang, Y., Raley, M. and Levine, J.F. 2008. Intraspecific phylogenetic relationships in the freshwater bivalve genus Alasmidonta (Bivalvia: Unionidae). North Carolina Department of Transportation, North Carolina.

Clarke, A. H. (1985). The tribe Alasmidontini (Unionidae: Anodontinae). Part II: Lasmigona and Simpsonaias. Smithsonian Contributions to Zoology, 399: 1-75.

Cowie, Robert H., Régnier, Claire, Fontaine, Benoît, and Bouchet, Philippe. (2017). Measuring the Sixth Extinction: what do mollusks tell us? The Nautilus 131(1): 3-41.

Cummings, K. and Cordeiro, J. (2011). Alasmidonta mccordi. In: IUCN 2011. IUCN Red List of Threatened Species. Version 2011.2. . Downloaded on 22 April 2012.

Cummings, K. & Cordeiro, J. 2011. Alasmidonta mccordi. The IUCN Red List of Threatened Species 2011: e.T780A13078346. Accessed on 02 July 2022.

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.

Mirarchi, R. E. (2004). Alabama Wildlife. Volume One: A Checklist of Vertebrates and Selected Invertebrates: Aquatic Mollusks, Fishes, Amphibians, Reptiles, Birds, and Mammals. University of Alabama Press: Tuscaloosa, Alabama. 209 pp.

Mirarchi, R.E., Garner, J.T., Mettee, M.F. and O'Neil, P.E. 2004. Imperilled Aquatic Molluscs and Fishes. University of Alabama Press, Tuscaloosa, Alabama.

Régnier, Claire, Fontaine, Benoît and Bouchet, Philippe. (2009). Not Knowing, Not Recording, Not Listing: Numerous Unnoticed Mollusk Extinctions. Conservation Biology 23(5): 1214-1221.

Turgeon, D.D., J.F. Quinn, Jr., A.E. Bogan, E.V. Coan, F.G. Hochberg, W.G. Lyons, P.M. Mikkelsen, R.J. Neves, C.F.E. Roper, G. Rosenberg, B. Roth, A. Scheltema, F.G. Thompson, M. Vecchione, and J.D. Williams. (1998). Common and scientific names of aquatic invertebrates from the United States and Canada: Mollusks. 2nd Edition. American Fisheries Society Special Publication 26, Bethesda, Maryland: 526 pp.

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.

Williams, James D., Wisniewski, Jason M. and Dinkins, Gerald R. (2022). Range extension and review of the conservation status of the freshwater mussel Alasmidonta mccordi Athearn, 1964 (Bivalvia, Unionidae) in the Coosa River drainage of Alabama and Georgia. Check List 18(2): 391-398.


<< Back to the Bivalvia (Mussels, Clams, Oysters etc.) database