Medionidus mcglameriae van der Schalie, 1939
Tombigbee moccasinshell
Taxonomy & Nomenclature
Now considered to be a synonym of Leptodea fragilis (Williams et al., 2008; Williams et al., 2017; Graf & Cummings, 2021, 2025).
Conservation Status
Invalid (synonym of Leptodea fragilis) (Williams et al., 2008; Williams et al., 2017; Graf & Cummings, 2021, 2025)
IUCN RedList status: Extinct
Previously considered Extinct (Bogan, 2000; Régnier et al., 2009; Cowie et al., 2017), prior to synonymisation under Leptodea fragilis (Williams et al., 2008; Williams et al., 2017; Graf & Cummings, 2021, 2025).
Distribution & Habitat
USA
Biology & Ecology
Hypodigm
Media
References
Original scientific description:
van der Schalie, H. (1939). Medionidus mcglameriae, a new naiad from the Tombigbee River, with notes on other naiads of that drainage. Occasional Papers of the Museum of Zoology, University of Michigan 407: 1-6. https://hdl.handle.net/2027.42/56846
Other references:
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, Arthur E. (Mollusc Specialist Group). (2000). Medionidus mcglameriae. The IUCN Red List of Threatened Species 2000: e.T12926A3398926. https://dx.doi.org/10.2305/IUCN.UK.2000.RLTS.T12926A3398926.en. Downloaded on 19 March 2017.
Burch, J. B. (1975). Freshwater unionacean clams (Mollusca: Pelecypoda) of North America. Malacological Publications: Hamburg, Michigan. 204 pp.
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, Kevin S. and Graf, D. L. (2010). Mollusca: Bivalvia, pp. 309-384. In: Thorp, J. H. and Covich, A. P. (eds.). Ecology and Classification of North American Freshwater Invertebrates. 3rd ed. Amsterdam, The Netherlands: Elsevier.
Eldridge, Niles. (1998). Life in the Balance: Humanity and the Biodiversity Crisis. Princeton, New Jersey: Princeton University Press.
Graf, Daniel L. and Cummings, Kevin S. (2007). Review of the systematics and global diversity of freshwater mussel species (Bivalvia: Unionoida). Journal of Molluscan Studies 73(4): 291-314. https://doi.org/10.1093/mollus/eym029
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 (36 pp.). https://doi.org/10.1093/mollus/eyaa034
Graf, Daniel L. and Cummings, Kevin S. (2025). The Freshwater Mussels (Unionoida) of the World (and other less consequential bivalves). MUSSEL Project Web Site, https://www.mussel-project.net/. Accessed 5 July 2025.
Haas, F. (1969). Superfamilia Unionacea. Das Tierreich 88: x, 1-663. Berlin: Walter de Gruyter & Co.
Hilton-Taylor, Craig. (2000). 2000 IUCN Red List of Threatened Species. IUCN, Gland, Switzerland and Cambridge, UK.
Johnson, R. I. (1977). Monograph of the genus Medionidus (Bivalvia: Unionidae) mostly from the Apalachicolan region, southeastern United States. Occasional Papers on Mollusks 4(56): 161-187.
Régnier, Claire, Fontaine, Benoît and Bouchet, Philippe. (2009). Not Knowing, Not Recording, Not Listing: Numerous Unnoticed Mollusk Extinctions. Conservation Biology 23(5): 1214-1221. https://doi.org/10.1111/j.1523-1739.2009.01245.x [Appendix S1-S2]
Turgeon, D. D., Bogan, A. E., Coan, E. V., Emerson, W. K., Lyons, W. G. et al. (1988). Common and Scientific Names of Aquatic Invertebrates from the United States and Canada: Mollusks. American Fisheries Society Special Publication (16). 277 pp.
U.S. Fish and Wildlife Service (USFWS). (2000). Recovery plan for the Mobile River basin aquatic ecosystem. U.S. Fish and Wildlife Service, Southeast Region, Atlanta, Georgia. 128 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., Bogan, Arthur E. and Garner, Jeffrey T. (2008). Freshwater mussels of Alabama and the Mobile Basin in Georgia, Mississippi and Tennessee. Tuscaloosa, Alabama: University of Alabama Press. xv + 908 pp.
Williams, James D., Warren, M. L., Cummings, Kevin S., Harris, J. L. and Neves, R. J. (1993). Conservation status of freshwater mussels of the United States and Canada. Fisheries 18(9): 6-22. https://doi.org/10.1577/1548-8446(1993)018%3C0006:CSOFMO%3E2.0.CO;2
http://www.marinespecies.org/aphia.php?p=taxdetails&id=857872
https://extinctanimals.proboards.com/thread/22119/medionidus-mcglameriae
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