# Obovaria subrotunda

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Species of bivalve

Obovaria subrotunda Conservation status Endangered (IUCN 3.1)[1] Vulnerable (NatureServe)[2] Scientific classification Kingdom: Animalia Phylum: Mollusca Class: Bivalvia Order: Unionida Family: Unionidae Genus: Obovaria Species: O. subrotunda Binomial name Obovaria subrotunda (Rafinesque, 1820) Synonyms[3] List Lampsilis orbiculata (Hildreth, 1828) Obovaria subrotunda subsp. lens (Lea, 1831) Obliquaria subrotunda Rafinesque, 1820 Unio zonalis Rafinesque, 1820 Unio levigata Rafinesque, 1820 Obovaria striata Rafinesque, 1820 Unio orbiculatus Hildreth, 1828 Unio rotundus Wood, 1828 Unio circulus Lea, 1829 Unio lens Lea, 1831 Unio leibii Lea, 1862 Unio depygis Conrad, 1866 Obovaria striata subsp. tuberculata Rafinesque, 1820 Obovaria striata subsp. rosea Rafinesque, 1820 Obovaria lens subsp. parva Simpson, 1914 Obovaria lens subsp. elongata Simpson, 1914 Obovaria subrotunda subsp. globula Morrison, 1942

***Obovaria subrotunda***, [commonly called](/source/Common_name) the **round hickorynut**, is a [species](/source/Species) of [freshwater mussel](/source/Freshwater_mussel), an [aquatic](/source/Aquatic_animal) [bivalve](/source/Bivalve) [mollusk](/source/Mollusk) in the family [Unionidae](/source/Unionidae), the river mussels.

## Distribution and conservation status

This species is native to eastern [North America](/source/North_America).

The Canadian [Species at Risk Act](/source/Species_at_Risk_Act) listed it in the [List of Wildlife Species at Risk](/source/List_of_Wildlife_Species_at_Risk) as being endangered in [Canada](/source/Canada).[4]

It was listed federally as a [threatened species](/source/Threatened_species) of the [United States](/source/United_States) under the [Endangered Species Act](/source/Endangered_Species_Act) in 2023.[5][6]

## References

1. **[^](#cite_ref-iucn_status_17_November_2021_1-0)** Woolnough, D.; Bogan, A.E. (2017). ["*Obovaria subrotunda*"](https://www.iucnredlist.org/species/15024/62905473). *[IUCN Red List of Threatened Species](/source/IUCN_Red_List)*. **2017** e.T15024A62905473. [doi](/source/Doi_(identifier)):[10.2305/IUCN.UK.2017-3.RLTS.T15024A62905473.en](https://doi.org/10.2305%2FIUCN.UK.2017-3.RLTS.T15024A62905473.en). Retrieved 17 November 2021.

1. **[^](#cite_ref-NS_2-0)** [NatureServe](/source/NatureServe). ["*Obovaria subrotunda*"](https://explorer.natureserve.org/Taxon/ELEMENT_GLOBAL.2.117121/). *NatureServe Explorer*. Arlington, Virginia. Retrieved 29 December 2025.

1. **[^](#cite_ref-3)** ["*Obovaria subrotunda* (Rafinesque, 1820)"](https://www.itis.gov/servlet/SingleRpt/SingleRpt?search_topic=TSN&search_value=80174). [Integrated Taxonomic Information System](/source/Integrated_Taxonomic_Information_System). Retrieved 2 December 2023.

1. **[^](#cite_ref-4)** COSEWIC. 2005. [Canadian Species at Risk](http://www.sararegistry.gc.ca/virtual_sara/files/species/clwsa%5F0505%5Fe%2Epdf). Committee on the Status of Endangered Wildlife in Canada. 64 pp., page 13.

1. **[^](#cite_ref-5)** ["Round hickorynut (*Obovaria subrotunda*)"](https://ecos.fws.gov/ecp/species/9879). *Environmental Conservation Online System*. U.S. Fish & Wildlife Service. Retrieved 2 December 2023.

1. **[^](#cite_ref-6)** 88 [FR](/source/Federal_Register) [14794](https://www.federalregister.gov/citation/88-FR-14794)

## External links

- Media related to [Obovaria subrotunda](https://commons.wikimedia.org/wiki/Category:Obovaria_subrotunda) at Wikimedia Commons

Taxon identifiers Obovaria subrotunda Wikidata: Q2892483 BOLD: 80600 CoL: 48B4S ECOS: 9879 EoL: 449452 GBIF: 2288370 iNaturalist: 107334 IRMNG: 11307659 ISC: 110520 ITIS: 80174 IUCN: 15024 NatureServe: 2.117121 NCBI: 301919 Open Tree of Life: 742098 WoRMS: 857349

This Unionidae-related article is a stub. You can help Wikipedia by adding missing information.

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Adapted from the Wikipedia article [Obovaria subrotunda](https://en.wikipedia.org/wiki/Obovaria_subrotunda) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Obovaria_subrotunda?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.