{{Short description|Species of bivalve}} {{Speciesbox | name = Shiny pigtoe | image = Shiny_Pigtoe_natdiglib_18728_large.jpg | image_caption = Museum specimen | status = CR | status_system = IUCN3.1 | status_ref = <ref name="iucn status 16 November 2021">{{cite iucn |author=Cummings, K. |author2=Cordeiro, J. |date=2012 |title=''Fusconaia cor'' |volume=2012 |article-number=e.T8778A3146798 |doi=10.2305/IUCN.UK.2012-1.RLTS.T8778A3146798.en |access-date=16 November 2021}}</ref> | status2 = LE | status2_system = ESA | status2_ref = <ref>{{cite web|url=https://ecos.fws.gov/ecp/species/2573|title=Shiny pigtoe (''Fusconaia cor'')|website=Environmental Conservation Online System|publisher=U.S. Fish & Wildlife Service|access-date=22 April 2023}}</ref><ref>{{Federal Register|41|24062}}</ref> | genus = Fusconaia | species = cor | authority = ([[Timothy Abbott Conrad|Conrad]], 1834) | synonyms = *''Fusconaia edgariana'' <small>(Lea, 1840)</small> *''Unio cor'' <small>Conrad, 1834</small> *''Unio edgarianus'' <small>Lea, 1840</small> *''Unio obuncus'' <small>Lea, 1871</small> *''Unio andersonensis'' <small>Lea, 1872</small> *''Fusconaia cor'' subsp. ''analoga'' <small>Ortmann, 1918</small> | synonyms_ref = <ref>{{ITIS|taxon=''Fusconaia cor'' (Conrad, 1834)|id=80044|access-date=22 April 2023}}</ref> }}
The '''shiny pigtoe''' ('''''Fusconaia cor''''') is a species of [[bivalve]] in the family [[Unionidae]]. It is [[Endemism|endemic]] to the [[United States]].
The shiny pigtoe has been eliminated from most of its historic range.<ref name="iucn status 16 November 2021"/> Populations currently exist in the [[Holston River|North Fork of the Holston River]], [[Clinch River|Clinch]], [[Powell River (Tennessee River tributary)|Powell]] and [[Paint Rock River|Paint Rock]] river systems in [[Alabama]], [[Tennessee]], and [[Virginia]].<ref name=tnc>{{cite web|url=https://explorer.natureserve.org/Taxon/ELEMENT_GLOBAL.2.108198/Fusconaia_cor|title=''Fusconaia cor''|website=NatureServe Network Biodiversity Location Data accessed through NatureServe Explorer|author=NatureServe|publisher=NatureServe|location=Arlington, Virginia|date=7 April 2023|access-date=22 April 2023}}</ref> Threats to the species include habitat alteration and fragmentation, hydroelectric [[dam]]s, wastewater discharge, water withdrawal, non-native species, and runoff of silt and other pollutants.<ref name="fws">{{cite web|url=https://ecos.fws.gov/ecp/species/2573|author=US Fish and Wildlife Service|title=Species profile for Shiny pigtoe (Fusconaia cor)}}</ref>
It is a medium-sized mussel that is about {{convert|2.5|in}} in size. It has a smooth and shiny oval-shaped shell with distinguishing dark green to blackish rays on a yellow to brown background. Younger specimens have a bolder ray color patterning. The inner [[nacre]] is white.<ref name="fws"/>
The shiny pigtoe is tachytichtic, spawning between late May and early June.<ref name=tnc/> Known [[glochidia]]l hosts include the common (''[[Luxilus cornutus]]''), warpaint (''[[Luxilus coccogenis]]''), telescope (''[[Notropis telescopus]]'') and whitetail (''[[Cyprinella galactura]]'') shiners.<ref name=tnc/>
This species appears to be most closely related to ''[[Fusconaia cuneolus]]''.<ref>{{cite journal |last1=Campbell |first1=David |last2=Lydeard |first2=Charles |date=2012 |title=Molecular Systematics of ''Fusconaia'' (Bivalvia: Unionidae: Ambleminae) |journal= American Malacological Bulletin |volume=30 |issue=1 |pages=1–17|doi=10.4003/006.030.0101|bibcode=2012AMalB..30....1C |s2cid=84552044 }}</ref>
==References== {{Reflist}}
{{Taxonbar|from=Q309011}}
[[Category:Molluscs of the United States]] [[Category:Fusconaia]] [[Category:Bivalves described in 1834]] [[Category:Taxa named by Timothy Abbott Conrad]] [[Category:Taxonomy articles created by Polbot]]
{{Unionidae-stub}}