{{Short description|Species of bivalve}} {{Speciesbox | image = Round hickorynut mussel (14133118825).jpg | status = EN | status_system = IUCN3.1 | status_ref = <ref name="iucn status 17 November 2021">{{cite iucn |author=Woolnough, D. |author2=Bogan, A.E. |date=2017 |title=''Obovaria subrotunda'' |volume=2017 |article-number=e.T15024A62905473 |doi=10.2305/IUCN.UK.2017-3.RLTS.T15024A62905473.en |access-date=17 November 2021}}</ref> | status2 = G3 | status2_system = TNC | status2_ref = <ref name=NS>{{cite NatureServe |id=2.117121 |title=''Obovaria subrotunda'' |access-date=29 December 2025}}</ref> | genus = Obovaria | species = subrotunda | authority = ([[Constantine Samuel Rafinesque-Schmaltz|Rafinesque]], 1820) |synonyms={{collapsible list|bullets=yes|''Lampsilis orbiculata'' <small>(Hildreth, 1828)</small>|''Obovaria subrotunda'' subsp. ''lens'' <small>(Lea, 1831)</small>|''Obliquaria subrotunda'' <small>Rafinesque, 1820</small>|''Unio zonalis'' <small>Rafinesque, 1820</small>|''Unio levigata'' <small>Rafinesque, 1820</small>|''Obovaria striata'' <small>Rafinesque, 1820</small>|''Unio orbiculatus'' <small>Hildreth, 1828</small>|''Unio rotundus'' <small>Wood, 1828</small>|''Unio circulus'' <small>Lea, 1829</small>|''Unio lens'' <small>Lea, 1831</small>|''Unio leibii'' <small>Lea, 1862</small>|''Unio depygis'' <small>Conrad, 1866</small>|''Obovaria striata'' subsp. ''tuberculata'' <small>Rafinesque, 1820</small>|''Obovaria striata'' subsp. ''rosea'' <small>Rafinesque, 1820</small>|''Obovaria lens'' subsp. ''parva'' <small>Simpson, 1914</small>|''Obovaria lens'' subsp. ''elongata'' <small>Simpson, 1914</small>|''Obovaria subrotunda'' subsp. ''globula'' <small>Morrison, 1942</small>}} |synonyms_ref=<ref>{{ITIS|taxon=''Obovaria subrotunda'' (Rafinesque, 1820)|id=80174|access-date=2 December 2023}}</ref> }}
'''''Obovaria subrotunda''''', [[common name|commonly called]] the '''round hickorynut''', is a [[species]] of [[freshwater mussel]], an [[aquatic animal|aquatic]] [[bivalve]] [[mollusk]] in the family [[Unionidae]], the river mussels.
== Distribution and conservation status ==
This species is native to eastern [[North America]].
The Canadian [[Species at Risk Act]] listed it in the [[List of Wildlife Species at Risk]] as being endangered in [[Canada]].<ref>COSEWIC. 2005. [http://www.sararegistry.gc.ca/virtual_sara/files/species/clwsa%5F0505%5Fe%2Epdf Canadian Species at Risk]. Committee on the Status of Endangered Wildlife in Canada. 64 pp., page 13.</ref>
It was listed federally as a [[threatened species]] of the [[United States]] under the [[Endangered Species Act]] in 2023.<ref>{{cite web|url=https://ecos.fws.gov/ecp/species/9879|title=Round hickorynut (''Obovaria subrotunda'')|website=Environmental Conservation Online System|publisher=U.S. Fish & Wildlife Service|access-date=2 December 2023}}</ref><ref>{{Federal Register|88|14794}}</ref>
==References== {{Reflist}}
==External links== *{{commons category-inline}}
{{Taxonbar|from=Q2892483}}
[[Category:Bivalves described in 1820]] [[Category:ESA threatened species]] [[Category:Obovaria|subrotunda]] [[Category:Molluscs of the United States]] [[Category:Molluscs of Canada]] [[Category:Taxa named by Constantine Samuel Rafinesque]] [[Category:Taxonomy articles created by Polbot]]
{{Unionidae-stub}}