The Recently Extinct Plants and Animals Database

Epioblasma biemarginata (I. Lea, 1857)

Angled riffleshell



Taxonomy & Nomenclature

Synonym/s: Dysnomia biemarginata I. Lea, 1857


Conservation Status

Last record: 1970

IUCN RedList status: Extinct


The Angled riffleshell was last seen in 1970 (Williams et. al. 2008).



Alabama/Kentucky/Tennessee, USA


It is known to have occurred historically in three states: Alabama, Kentucky and Tennessee. Bogan (2000) lists Illinois as another state in which this species occurred. However, an extensive review of the literature (NatureServe, 2011) does not mention Illinois as a confirmed location of this species, nor does it even mention Illinois in the entire species account.


Biology & Ecology




5 specimens are in the Illinois Natural History Survey mollusc [url=]collection[/url]:

INHS 17042
INHS 20269
INHS 20270
INHS 20271
INHS 20273






Bogan, A. E. (2000). Epioblasma biemarginata. In: IUCN 2011. IUCN Red List of Threatened Species. Version 2011.1. ( Downloaded on 17 September 2011.

Bogan, Arthur E. and Parmalee, Paul W. (1983). Tennessee's Rare Wildlife. Volume II: The Mollusks. Tennessee Wildlife Resources Agency.

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.

Johnson, R.I. 1978. Systematics and zoogeography of Plagiola (= Dysnomia = Epioblasma), an almost extinct genus of freshwater mussels (Bivalvia: Unionidae) from middle North America. Bulletin of the Museum of Comparative Zoology, 148(6): 239-320.

NatureServe. (2014). NatureServe Explorer: An online encyclopedia of life [web application]. Version 7.1. NatureServe, Arlington, Virginia. Available (Accessed: January 28, 2015).

Ortmann, A.E. 1925. The naiad fauna of the Tennessee River system below Walden Gorge. The American Midland Naturalist, 9(7): 321-371.

Parmalee, P.W. and A.E. Bogan. 1998. The Freshwater Mussels of Tennessee. University of Tennessee Press: Knoxville, Tennessee. 328 pp.

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

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, J.D., A.E. Bogan, and J.T. Garner. (2008). Freshwater Mussels of Alabama & the Mobile Basin in Georgia, Mississippi & Tennessee. University of Alabama Press: Tuscaloosa, Alabama. 908 pp.


<< Back to the  database