|A 100-year-old museum shell of the wicker ancylid from Tallaseehatchee Creek in Alabama|
This species is endemic to the United States and was thought to be extinct, until its rediscovery in 2011. It occurred in the Mobile River Basin rivers and their tributaries. The type locality is the Black Warrior River, south of Blount Springs, Alabama.
Over the past 20 years, extensive surveys that included hundreds of collecting sites in the drainages of the Coosa River, Cahaba River and Black Warrior River (its type locality) had failed to find Rhodacmea filosa. However, it does still persist in a Choccolocco Creek, a Coosa River tributary. Morphometric and phylogenetic analyses confirm the taxonomic validity of this material. Its survival in Choccolocco Creek is somewhat surprising, given the serious episodes of industrial pollution experienced by this watershed.
Shell regularly oval, rather elevated; with numerous radiating prominent lines; apex very prominent, inclined, eroded, not nearly central.
- Cordeiro, J. (2011). "Rhodacmea filosa". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 13 May 2014.
- Conrad T. A. (1834). "New fresh-water shells of the United States, with coloured illustrations, and a monograph of the genus Anculotus of Say; also a synopsis of the American naiads". Judah Dobson, Philadelphia, 76 pp. page 57.
- Ó Foighil D., Li J., Lee T., Johnson P., Evans R. & Burch J. B. (2011). "Conservation Genetics of a Critically Endangered Limpet Genus and Rediscovery of an Extinct Species". PLoS ONE 6(5): e20496. doi:10.1371/journal.pone.0020496.
- University of Michigan (2011, June 3). Mass extinction victim survives: Snail long thought extinct isn't. ScienceDaily.com. Retrieved June 5, 2011.
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