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Taxonomy

all genera

Unionidae

Margaritiferidae

Hyriidae

Etheriidae

Mycetopodidae

Iridinidae


Species & Genus Richness by
Taxonomy

Geography

Summary

North America

Central America

South America

Afrotropics

North Eurasia

East Asia

Australasia


Species Richness & Endemism by
Geography

Data last updated
Mon 1 Dec 2025

Publication Williams et al. (2017): taxonomic opinions

publication summary

Complete Citation

Williams, J.D., A.E. Bogan, R.S. Butler, K.S. Cummings, J.T. Garner et al. 2017. A revised checklist of the freshwater mussels (Mollusca: Bivalvia: Unionida) of the United States and Canada. Freshwater Mollusk Biology and Conservation 20(2): 33-58. Available electronically.

Taxonomic Opinions

Actinonaias ligamentina (Lamarck, 1819) = Ortmanniana ligamentina

Actinonaias pectorosa (Conrad, 1834) = Ortmanniana pectorosa

Alasmidonta arcula (Lea, 1838)

Alasmidonta atropurpurea (Rafinesque, 1831)

Alasmidonta heterodon (Lea, 1829) = Prolasmidonta heterodon

Alasmidonta marginata Say, 1818

Alasmidonta mccordi Athearn, 1964

Alasmidonta raveneliana (Lea, 1834)

Alasmidonta robusta Clarke, 1981

Alasmidonta triangulata (Lea, 1858)

Alasmidonta undulata (Say, 1817)

Alasmidonta varicosa (Lamarck, 1819)

Alasmidonta viridis (Rafinesque, 1820) = Sulcularia viridis

Alasmidonta wrightiana (Walker, 1901)

Amblema elliottii (Lea, 1856)

Amblema neislerii (Lea, 1858)

Amblema plicata (Say, 1817)

Anodonta californiensis Lea, 1852
+ Anodonta dejecta Lewis, 1875

Anodonta kennerlyi Lea, 1860

Anodonta nuttalliana Lea, 1838

Anodonta oregonensis Lea, 1838

Anodontoides denigrata (Lea, 1852) = Anodontoides denigratus

Anodontoides ferussacianus (Lea, 1834)

Anodontoides radiatus (Conrad, 1834) = Strophitus radiatus

Arcidens confragosus (Say, 1829)

Arcidens wheeleri (Ortmann & Walker, 1912)

Cyclonaias archeri (Frierson, 1905) = Pustulosa kieneriana

Cyclonaias asperata (Lea, 1861) = Pustulosa kieneriana

Cyclonaias aurea (Lea, 1859) = Pustulosa pustulosa

Cyclonaias houstonensis (Lea, 1859) = Pustulosa pustulosa

Cyclonaias infucata (Conrad, 1834) = Pustulosa infucata

Cyclonaias kieneriana (Lea, 1852) = Pustulosa kieneriana

Cyclonaias kleiniana (Lea, 1852) = Pustulosa kleiniana

Cyclonaias mortoni (Conrad, 1835) = Pustulosa pustulosa

Cyclonaias nodulata (Rafinesque, 1820) = Pustulosa nodulata

Cyclonaias petrina (Gould, 1855) = Pustulosa petrina

Cyclonaias pustulosa (Lea, 1831) = Pustulosa pustulosa

Cyclonaias refulgens (Lea, 1868) = Pustulosa pustulosa

Cyclonaias succissa (Lea, 1852) = Pustulosa succissa

Cyclonaias tuberculata (Rafinesque, 1820)

Cyprogenia aberti (Conrad, 1850)

Cyprogenia stegaria (Rafinesque, 1820)

Cyrtonaias tampicoensis (Lea, 1838) = Mesonaias tampicoensis

Disconaias fimbriata (Frierson, 1907)
+ Lampsilis (Proptera) salinasensis Dall, 1908

Dromus dromas (Lea, 1834)

Ellipsaria lineolata (Rafinesque, 1820)

Elliptio ahenea (Lea, 1843)
+ Unio waltoni B.H. Wright, 1888

Elliptio angustata (Lea, 1831)

Elliptio arca (Conrad, 1834)

Elliptio arctata (Conrad, 1834)

Elliptio chipolaensis (Walker, 1905)

Elliptio cistellaeformis (Lea, 1863)

Elliptio complanata (Lightfoot, 1786)

Elliptio congaraea (Lea, 1831)
+ Unio waccamawensis Lea, 1863

Elliptio crassidens (Lamarck, 1819)

Elliptio dariensis (Lea, 1842)

Elliptio downiei (Lea, 1858)

Elliptio fisheriana (Lea, 1838)

Elliptio folliculata (Lea, 1838)

Elliptio fraterna (Lea, 1852)

Elliptio fumata (Lea, 1857)

Elliptio hopetonensis (Lea, 1838)

Elliptio icterina (Conrad, 1834)
+ Unio errans Lea, 1857
+ Unio hepaticus Lea, 1859
+ Unio lugubris Lea, 1838
+ Unio raveneli Conrad, 1834

Elliptio jayensis (Lea, 1838)
+ Unio buckleyi Lea, 1843

Elliptio lanceolata (Lea, 1828)

Elliptio marsupiobesa Fuller, 1972

Elliptio mcmichaeli Clench & Turner, 1956

Elliptio monroensis (Lea, 1843)

Elliptio nigella (Lea, 1852)

Elliptio occulta (Lea, 1843)

Elliptio producta (Conrad, 1836)

Elliptio pullata (Lea, 1856)

Elliptio purpurella (Lea, 1857)

Elliptio roanokensis (Lea, 1838)
+ Elliptio judithae Clarke, 1986

Elliptio shepardiana (Lea, 1834)

Elliptio spinosa (Lea, 1836)

Elliptoideus sloatianus (Lea, 1840)

Epioblasma ahlstedti Jones & Neves, 2010

Epioblasma arcaeformis (Lea, 1831)

Epioblasma aureola Jones & Neves, 2010

Epioblasma biemarginata (Lea, 1857)

Epioblasma brevidens (Lea, 1831)

Epioblasma capsaeformis (Lea, 1834)

Epioblasma cincinnatiensis (Lea, 1840)

Epioblasma curtisii (Frierson & Utterback, 1916)

Epioblasma flexuosa (Rafinesque, 1820)

Epioblasma florentina (Lea, 1857)

Epioblasma gubernaculum (Reeve, 1865)

Epioblasma haysiana (Lea, 1834)

Epioblasma lenior (Lea, 1842)

Epioblasma lewisii (Walker, 1910)

Epioblasma metastriata (Conrad, 1838)

Epioblasma obliquata (Rafinesque, 1820)

Epioblasma othcaloogensis (Lea, 1857)

Epioblasma penita (Conrad, 1834)

Epioblasma perobliqua (Conrad, 1836)

Epioblasma personata (Say, 1829)

Epioblasma propinqua (Lea, 1857)

Epioblasma rangiana (Lea, 1838)

Epioblasma sampsonii (Lea, 1861)

Epioblasma stewardsonii (Lea, 1852)

Epioblasma torulosa (Rafinesque, 1820)

Epioblasma triquetra (Rafinesque, 1820)

Epioblasma turgidula (Lea, 1858)

Epioblasma walkeri (Wilson & Clark, 1914)

Eurynia dilatata (Rafinesque, 1820)

Fusconaia burkei (Walker, 1922)

Fusconaia cerina (Conrad, 1838)

Fusconaia chunii (Lea, 1861) = Fusconaia askewi
+ Unio askewi Marsh, 1896
+ Quadrula lananensis Frierson, 1901

Fusconaia chunii (Lea, 1861) = Fusconaia lananensis

Fusconaia chunii (Lea, 1861)

Fusconaia cor (Conrad, 1834)

Fusconaia cuneolus (Lea, 1840)

Fusconaia escambia Clench & Turner, 1956

Fusconaia flava (Rafinesque, 1820)

Fusconaia masoni (Conrad, 1834)
+ Unio subplanus Conrad, 1837

Fusconaia mitchelli (Simpson, 1895)

Fusconaia ozarkensis (Call, 1887)

Fusconaia subrotunda (Lea, 1831)

Glebula rotundata (Lamarck, 1819)

Gonidea angulata (Lea, 1838)

Hamiota altilis (Conrad, 1834)

Hamiota australis (Simpson, 1900)

Hamiota perovalis (Conrad, 1834)

Hamiota subangulata (Lea, 1840)

Hemistena lata (Rafinesque, 1820)

Lampsilis abrupta (Say, 1831)

Lampsilis binominata Simpson, 1900

Lampsilis bracteata (Gould, 1855)

Lampsilis brittsi Simpson, 1900

Lampsilis cardium Rafinesque, 1820

Lampsilis cariosa (Say, 1817)

Lampsilis dolabraeformis (Lea, 1838)

Lampsilis fasciola Rafinesque, 1820

Lampsilis floridensis (Lea, 1852)

Lampsilis higginsii (Lea, 1857)

Lampsilis hydiana (Lea, 1838)

Lampsilis ornata (Conrad, 1835)

Lampsilis ovata (Say, 1817)

Lampsilis powellii (Lea, 1852)

Lampsilis radiata (Gmelin, 1791)
+ Lampsilis (s.s.) fullerkati R.I. Johnson, 1984
+ Unio conspicuus Lea, 1872

Lampsilis rafinesqueana Frierson, 1927

Lampsilis reeveiana (Lea, 1852)
+ Unio breviculus Call, 1887

Lampsilis satura (Lea, 1852)

Lampsilis siliquoidea (Barnes, 1823)

Lampsilis splendida (Lea, 1838)

Lampsilis straminea (Conrad, 1834)
+ Unio claibornensis Lea, 1838

Lampsilis streckeri Frierson, 1927

Lampsilis teres (Rafinesque, 1820)

Lampsilis virescens (Lea, 1858)

Lasmigona alabamensis Clarke, 1985 = Pterosyna alabamensis

Lasmigona complanata (Barnes, 1823) = Pterosyna complanata

Lasmigona compressa (Lea, 1829) = Platynaias compressa

Lasmigona costata (Rafinesque, 1820)

Lasmigona decorata (Lea, 1852) = Platynaias decorata

Lasmigona etowaensis (Conrad, 1849) = Alasminota etowaensis

Lasmigona holstonia (Lea, 1838) = Alasminota holstonia

Lasmigona subviridis (Conrad, 1835) = Platynaias subviridis

Lemiox rimosus (Rafinesque, 1831)

Leptodea fragilis (Rafinesque, 1820) = Potamilus fragilis
+ Medionidus mcglameriae van der Schalie, 1939

Leptodea leptodon (Rafinesque, 1820) = Potamilus leptodon

Leptodea ochracea (Say, 1817) = Atlanticoncha ochracea

Ligumia nasuta (Say, 1817) = Sagittunio nasutus

Ligumia recta (Lamarck, 1819)

Ligumia subrostrata (Say, 1831) = Sagittunio subrostratus

Margaritifera falcata (Gould, 1850)

Margaritifera hembeli (Conrad, 1838)

Margaritifera margaritifera (Linnaeus, 1758)

Margaritifera marrianae Johnson, 1983

Margaritifera monodonta (Say, 1829) = Cumberlandia monodonta

Medionidus acutissimus (Lea, 1831)

Medionidus conradicus (Lea, 1834)

Medionidus parvulus (Lea, 1860)

Medionidus penicillatus (Lea, 1857)

Medionidus simpsonianus Walker, 1905

Medionidus walkeri (Wright, 1897)

Megalonaias nervosa (Rafinesque, 1820)

Obliquaria reflexa Rafinesque, 1820

Obovaria arkansasensis (Lea, 1862)
+ Unio (Obovaria) jacksoniana Frierson, 1912

Obovaria choctawensis (Athearn, 1964)

Obovaria haddletoni (Athearn, 1964)

Obovaria olivaria (Rafinesque, 1820)

Obovaria retusa (Lamarck, 1819)

Obovaria subrotunda (Rafinesque, 1820)

Obovaria unicolor (Lea, 1845)

Parvaspina collina (Conrad, 1836)

Parvaspina steinstansana (Johnson & Clarke, 1983)

Pegias fabula (Lea, 1838)

Plectomerus dombeyanus (Valenciennes, 1827)

Plethobasus cicatricosus (Say, 1829)

Plethobasus cooperianus (Lea, 1834)

Plethobasus cyphyus (Rafinesque, 1820)

Pleurobema athearni Gangloff, Williams, and Feminella, 2006

Pleurobema beadleianum (Lea, 1861)

Pleurobema clava (Lamarck, 1819)
+ Unio bournianus Lea, 1840

Pleurobema cordatum (Rafinesque, 1820)

Pleurobema curtum (Lea, 1859)

Pleurobema decisum (Lea, 1831)
+ Unio chattanoogaensis Lea, 1858

Pleurobema fibuloides (Lea, 1859)

Pleurobema georgianum (Lea, 1841)
+ Unio nucleopsis Conrad, 1849
+ Unio troschelianus Lea, 1852

Pleurobema hanleyianum (Lea, 1852)

Pleurobema hartmanianum (Lea, 1860)

Pleurobema marshalli Frierson, 1927

Pleurobema oviforme (Conrad, 1834)

Pleurobema perovatum (Conrad, 1834)
+ Unio flavidulus Lea, 1861
+ Unio johannis Lea, 1859

Pleurobema plenum (Lea, 1840)

Pleurobema pyriforme (Lea, 1857)

Pleurobema riddellii (Lea, 1861)

Pleurobema rubellum (Conrad, 1834)
+ Pleurobema avellana Simpson, 1900
+ Unio furvus Conrad, 1834
+ Unio (Pleurobema) hagleri Frierson, 1900

Pleurobema rubrum (Rafinesque, 1820) = Pleurobema sintoxia

Pleurobema sintoxia (Rafinesque, 1820)

Pleurobema stabile (Lea, 1861)
+ Unio murrayensis Lea, 1868

Pleurobema strodeanum (Wright, 1898)

Pleurobema taitianum (Lea, 1834)

Pleurobema verum (Lea, 1861)

Pleuronaia barnesiana (Lea, 1838)

Pleuronaia dolabelloides (Lea, 1840)

Pleuronaia gibber (Lea, 1838)

Popenaias popeii (Lea, 1857)

Potamilus alatus (Say, 1817)

Potamilus amphichaenus (Frierson, 1898)

Potamilus capax (Green, 1832)

Potamilus inflatus (Lea, 1831)

Potamilus metnecktayi Johnson, 1998

Potamilus ohiensis (Rafinesque, 1820)

Potamilus purpuratus (Lamarck, 1819)

Ptychobranchus fasciolaris (Rafinesque, 1820)

Ptychobranchus foremanianus (Lea, 1842)

Ptychobranchus greenii (Conrad, 1834)

Ptychobranchus jonesi (van der Schalie, 1934)

Ptychobranchus occidentalis (Conrad, 1836)

Ptychobranchus subtentus (Say, 1825)

Pyganodon cataracta (Say, 1817)

Pyganodon fragilis (Lamarck, 1819)

Pyganodon gibbosa (Say, 1824)

Pyganodon grandis (Say, 1829)

Pyganodon lacustris (Lea, 1857)

Quadrula apiculata (Say, 1829) = Quadrula quadrula

Quadrula couchiana (Lea, 1860)

Quadrula fragosa (Conrad, 1835)

Quadrula nobilis (Conrad, 1854)

Quadrula quadrula (Rafinesque, 1820)

Quadrula rumphiana (Lea, 1852) = Quadrula quadrula

Reginaia apalachicola (Williams & Fradkin, 1999)

Reginaia ebenus (Lea, 1831)

Reginaia rotulata (Wright, 1899)

Simpsonaias ambigua (Say, 1825)

Sinanodonta beringiana (Middendorff, 1851) = Beringiana beringiana

Sinanodonta woodiana (Lea, 1834)

Strophitus connasaugaensis (Lea, 1858) = Pseudodontoideus connasaugaensis

Strophitus subvexus (Conrad, 1834) = Pseudodontoideus subvexus

Strophitus undulatus (Say, 1817)

Theliderma cylindrica (Say, 1817)
+ Unio cylindricus var. strigillatus B.H. Wright, 1898

Theliderma intermedia (Conrad, 1836)

Theliderma metanevra (Rafinesque, 1820)
+ Unio tuberosus Lea, 1840

Theliderma sparsa (Lea, 1841)

Theliderma stapes (Lea, 1831)

Toxolasma corvunculus (Lea, 1868)

Toxolasma cylindrellus (Lea, 1868)

Toxolasma lividum Rafinesque, 1831

Toxolasma parvum (Barnes, 1823)

Toxolasma paulum (Lea, 1840)

Toxolasma pullus (Conrad, 1838)

Toxolasma texasiense (Lea, 1857)
+ Lampsilis mearnsi Simpson, 1900

Tritogonia verrucosa (Rafinesque, 1820) = Quadrula verrucosa

Truncilla cognata (Lea, 1860)

Truncilla donaciformis (Lea, 1828)

Truncilla macrodon (Lea, 1859)

Truncilla truncata Rafinesque, 1820

Uniomerus carolinianus (Bosc, 1801)

Uniomerus columbensis (Lea, 1857)

Uniomerus declivis (Say, 1831)

Uniomerus tetralasmus (Say, 1831)

Utterbackia imbecillis (Say, 1829)

Utterbackia peggyae (Johnson, 1965)

Utterbackia peninsularis Bogan & Hoeh, 1995

Utterbackiana couperiana (Lea, 1840)

Utterbackiana hartfieldorum (Williams, Bogan, and Garner, 2009)

Utterbackiana heardi (Gordon & Hoeh, 1995)

Utterbackiana implicata (Say, 1829)

Utterbackiana suborbiculata (Say, 1831)

Venustaconcha ellipsiformis (Conrad, 1836)

Venustaconcha pleasii (Marsh, 1891)

Venustaconcha trabalis (Conrad, 1834)
+ Unio perpurpureus Lea, 1861

Venustaconcha troostensis (Lea, 1834)

Villosa amygdalum (Lea, 1843)

Villosa constricta (Conrad, 1838) = Venustaconcha constricta

Villosa delumbis (Conrad, 1834)

Villosa fabalis (Lea, 1831) = Paetulunio fabalis

Villosa iris (Lea, 1829) = Cambarunio iris

Villosa lienosa (Conrad, 1834) = Leaunio lienosus

Villosa nebulosa (Conrad, 1834) = Cambarunio nebulosus

Villosa ortmanni (Walker, 1925) = Leaunio ortmanni

Villosa sima (Lea, 1838) = Cambarunio simus

Villosa taeniata (Conrad, 1834) = Cambarunio taeniatus

Villosa umbrans (Lea, 1857) = Leaunio umbrans

Villosa vanuxemensis (Lea, 1838) = Leaunio vanuxemensis

Villosa vaughaniana (Lea, 1838) = Sagittunio vaughanianus

Villosa vibex (Conrad, 1834)

Villosa villosa (Wright, 1898)

 
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