Alasmidonta wrightiana (Walker, 1901)

Ochlockonee arcmussel



Taxonomy & Nomenclature



Conservation Status


Last record: 1931 (NatureServe, 2014)

IUCN RedList status: Extinct



Ochlockonee River, Florida, USA


Reports of this species from Georgia (Walker, 1901; Athearn, 1998) are likely in error (NatureServe, 2014).


Biology & Ecology




Only known from 15 specimens.

Holotype: MZUM 74938






Athearn, H. D. (1998). Additional records and notes on the unionid fauna of the Gulf Drainage of Alabama, Georgia, and Florida. Occasional Papers on Mollusks, 5(76): 465-467.

Baillie, J. and Groombridge, B. (eds). 1996. 1996 IUCN Red List of Threatened Animals. pp. 378. International Union for Conservation of Nature, Gland, Switzerland and Cambridge, UK.

Bogan, A. E (2000). Alasmidonta wrightiana. In: IUCN 2011. IUCN Red List of Threatened Species. Version 2011.1. ( Downloaded on 07 July 2011.

Bogan, A.E. (Mollusc Specialist Group). 2000. Alasmidonta wrightiana. The IUCN Red List of Threatened Species 2000: e.T778A13078151. Accessed on 30 June 2022.

Clarke, A. H. (1981). The tribe Alasmidontini (Unionidae: Anodontinae), Part I: Pegias, Alasmidonta, and Arcidens. Smithsonian Contributions to Zoology 326: 1-101.

Clench, W.J. and R.D. Turner. 1956. Freshwater mollusks of Alabama, Georgia, and Florida from the Escambia to the Suwanee River. Bulletin of the Florida State Museum Biological Sciences, 1(3): 97-239.

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.

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.

Groombridge, B. (ed.). 1994. 1994 IUCN Red List of Threatened Animals. IUCN, Gland, Switzerland and Cambridge, UK.

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.

Hilton-Taylor, C. 2000. 2000 IUCN Red List of Threatened Species. IUCN, Gland, Switzerland and Cambridge, UK.

IUCN. 1990. 1990 IUCN Red List of Threatened Animals. Gland, Switzerland and Cambridge, UK.

Johnson, R.I. 1967. Additions to the Unionid fauna of the Gulf Drainage of Alabama, Georgia and Florida (Mollusca: Bivalvia). Breviora, 270: 1-21.

NatureServe. (2014). NatureServe Explorer: An online encyclopedia of life [web application]. Version 7.1. NatureServe, Arlington, Virginia. Available (Accessed: January 27, 2015).

Sandra Pursifull, Jordan Holcomb, Matthew Rowe, James D. Williams, and Jason M. Wisniewski. (2021). Status of Freshwater Mussels in the Ochlockonee River Basin of Georgia and Florida. Southeastern Naturalist 20(1): 1-19. doi: [Abstract]

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.


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