Epioblasma walkeri

Epioblasma walkeri
Conservation status
	; Critically Imperiled (NatureServe)[1]
	; Endangered (ESA)[2][3]
Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Bivalvia
Order:	Unionida
Family:	Unionidae
Genus:	Epioblasma
Species:	E. walkeri
Binomial name
	Epioblasma walkeri; (Wilson & H.W. Clark, 1914)
Synonyms
	Epioblasma florentina walkeri

Epioblasma walkeri, common name the tan riffleshell, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.

Many scientists now recognize this mussel as synonymous or a subspecies of the presumed extinct Epioblasma florentina due to integrating shell characteristics between them.

At the time of its listing in 1977 under the Endangered Species Act of 1973, its range was limited to the lower Red River (Cumberland system), the middle fork of the Holston River, a possible population in the Stones River, the Duck River, where its population was threatened by a proposed Tennessee Valley Authority dam, and the Clinch River.[3] The population in Indian Creek in the upper Clinch River basin was proposed as a separate subspecies by Jones, Neves, Ahlstedt and Hallerman in 2006.[4]

It is listed under Appendix I of the Convention on International Trade in Endangered Species of Wild Fauna and Flora.[5]

References

NatureServe (3 March 2023). "Epioblasma walkeri". NatureServe Network Biodiversity Location Data accessed through NatureServe Explorer. Arlington, Virginia: NatureServe. Retrieved 7 April 2023.
"Tan riffleshell (Epioblasma florentina walkeri (=E. walkeri))". Environmental Conservation Online System. U.S. Fish & Wildlife Service. Retrieved 7 April 2023.
42 FR 42351
Jones, Jess W.; Neves, Richard J.; Ahlstedt, Steven A.; Hallerman, Eric M. (2006). "A holistic approach to taxonomic evaluation of two closely related endangered freshwater mussel species, the oyster mussel Epioblasma capsaeformis and tan riffleshell Epioblasma florentina walkeri (Bivalvia: Unionidae)". Journal of Molluscan Studies. 72 (3): 267–283. doi:10.1093/mollus/eyl004.
"Appendices I, II and III" (PDF). Convention on International Trade in Endangered Species of Wild Fauna and Flora. 23 February 2023. p. 59. Retrieved 7 April 2023.

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[natureserve-1] NatureServe (3 March 2023). "Epioblasma walkeri". NatureServe Network Biodiversity Location Data accessed through NatureServe Explorer. Arlington, Virginia: NatureServe. Retrieved 7 April 2023.

[2] "Tan riffleshell (Epioblasma florentina walkeri (=E. walkeri))". Environmental Conservation Online System. U.S. Fish & Wildlife Service. Retrieved 7 April 2023.

[fr42-3] 42 FR 42351

[4] Jones, Jess W.; Neves, Richard J.; Ahlstedt, Steven A.; Hallerman, Eric M. (2006). "A holistic approach to taxonomic evaluation of two closely related endangered freshwater mussel species, the oyster mussel Epioblasma capsaeformis and tan riffleshell Epioblasma florentina walkeri (Bivalvia: Unionidae)". Journal of Molluscan Studies. 72 (3): 267–283. doi:10.1093/mollus/eyl004.

[5] "Appendices I, II and III" (PDF). Convention on International Trade in Endangered Species of Wild Fauna and Flora. 23 February 2023. p. 59. Retrieved 7 April 2023.