Unio clava Lamarck, 1819
Lamarck, 1819, Hist. Natur. Anim. sans Vert. 6: 74, sp. 18.
Type(s): TYPE MNHN_MPL_0015, Amer. Sept.

Unio clava — Lamarck (1819), Menke (1828), Menke (1830), Conrad (1835), Ferussac (1835), Küster (1848), Conrad (1853), Sowerby (1868)
Unio scalenia — Lea (1834)
Margarita (Unio) clavus — Lea (1836), Lea (1838)
Unio clavus — Hanley (1843), B.H. Wright (1888), Call (1895)
Pleurobema clava — Agassiz (1852), Ortmann (1909), Ortmann (1909), Ortmann (1909), ..., Graf & Cummings (2021), Johnson et al. (2023), Hopper et al. (2023), Hauck et al. (2023)
Margaron (Unio) clavus — Lea (1852), Lea (1870)
Unio (Lampsilis) clavus — Adams & Adams (1857)
Unio (Limnium sec. Scalenaria) clavus — Fischer (1887)
Pleurobema (s.s.) clava — Simpson (1900), Simpson (1914)
Unio (s.s.) clavus — Call (1900)
Pleurobema (s.s.) mytiloides — Frierson (1927)
Pleurobema mytiloides — Modell (1942)
Pleurobema clava clava — Haas (1969)

Unio bournianus Lea, 1840
Lea, 1840, Proc. Amer. Phil. Soc. 1: 288.
Lea, 1842, Trans. Amer. Phil. Soc. 8 [O. 3]: 213 [51], pl. 15, fig. 28.
Type(s): HOLOTYPE USNM_84683, Scioto R., Chillicothe, Ohio.

Unio bournianus — Lea (1840), Conrad (1853), B.H. Wright (1888)
Margaron (Unio) bournianus — Lea (1852), Lea (1870)
Unio (Lampsilis) bournianus — Adams & Adams (1857)
Unio (sec. Lampsilis) bournianus — Paetel (1890)
Pleurobema (s.s.) bournianus — Simpson (1900)
Pleurobema (s.s.) bournianum — Simpson (1914)
Quadrula (Pleuronaia) cor — Frierson (1927), Haas (1969)
Pleurobema bournianum — Turgeon et al. (1988), Williams et al. (1993), Turgeon et al. (1998), IUCN (2000), Graf & Cummings (2007), Cummings & Graf (2010), ITIS (2012)
Pleurobema clava — Williams et al. (2008), Watters et al. (2009), Williams et al. (2017), Graf & Cummings (2021)

Pleurobema mytiloides Rafinesque, 1820
Rafinesque, 1819, Jour. Phys. Chim. Hist. Nat. 88: 427 [as ‘Unio (Pleurobema) mytiloïdes’]. [nomen nudum]
Rafinesque, 1820, Ann. Gén. Sci. Phys. 5 (13): 313, pl. 82, figs. 8-10 [also as ‘U. mytiloides’].
Rafinesque, 1864, [in] Binney & Tryon, reprint: 29, 56.
Type(s): LECTOTYPE ANSP_20223, [no locality available - North America].

Pleurobema mytiloides — Rafinesque (1820), Agassiz (1852), Modell (1942), Haas (1969)
Unio (Pleurobema) mytiloides — Rafinesque (1819)
Unio mytiloides — Lea (1829), Ravenel (1834), Jay (1835), Ferussac (1835), Conrad (1836), Küster (1852), Lapham (1860), Küster (1862), Lewis (1871), B.H. Wright (1888)
Margarita (Unio) mytiloides — Lea (1836), Lea (1838)
Unio (s.s.) mytiloides — Swainson (1840)
Unio pyramidatus — Hanley (1843)
Margaron (Unio) mytiloides — Lea (1852), Lea (1870)
Unio clava — Conrad (1853)
Unio (Obovaria) mytiloides — Mörch (1853)
Unio (Lampsilis) mytiloides — Adams & Adams (1857)
Unio (Limnium sec. Pleurobema) mytiloides — Fischer (1887)
Pleurobema clava — Vanatta (1915), Ortmann & Walker (1922), F.C. Baker (1928), Thiele (1934), ..., Williams et al. (2008), Watters et al. (2009), Campbell & Lydeard (2012), Graf & Cummings (2021)
Pleurobema obliqua rubrum — Ortmann (1918)
Pleurobema (s.s.) mytiloides — Frierson (1927), Haas (1930)
Pleurobema clava clava — Haas (1969)

Unio patulus Lea, 1829
Lea, 1829, Trans. Amer. Phil. Soc. 3 [O. 1]: 441, pl. 12, fig. 20.
Type(s): HOLOTYPE USNM_84760, Ohio ?

Unio patulus — Lea (1829), Jay (1835), Conrad (1838), Hanley (1843), Küster (1862), Reeve (1864), Lewis (1871), B.H. Wright (1888), de Gregorio (1914)
Unio cuneatus — Ferussac (1835)
Margarita (Unio) patulus — Lea (1836), Lea (1838)
Unio (Cunicula) patula — Swainson (1840)
Margaron (Unio) patulus — Lea (1852), Lea (1870)
Unio (Lampsilis) patulus — Adams & Adams (1857)
Unio clavus — Call (1895)
Pleurobema (s.s.) clava — Simpson (1900), Simpson (1914)
Unio (s.s.) clavus — Call (1900)
Pleurobema clava — Ortmann & Walker (1922), Burch (1975), Strayer & Jirka (1997), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)
Pleurobema (s.s.) clava-patulum — Frierson (1927)
Pleurobema clava patulus — Haas (1969)

Obliquaria (Scalenaria) scalenia Rafinesque, 1820
Rafinesque, 1820, Ann. Gén. Sci. Phys. 5 (13): 309, pl. 81, figs. 24-25 [also as ‘U. scalenia’].
Rafinesque, 1864, [in] Binney & Tryon, reprint: 53.
Type(s): NEOTYPE ANSP_20229, Ohio.

Obliquaria (Scalenaria) scalenia — Rafinesque (1820)
Unio scalenius — Lea (1829), Ravenel (1834), Jay (1835)
Unio scalenia — Lea (1834)
Unio clava — Ferussac (1835), Conrad (1835), Küster (1848), Conrad (1853)
Margarita (Unio) clavus — Lea (1836), Lea (1838)
Unio clavus — Hanley (1843)
Margaron (Unio) clavus — Lea (1852), Lea (1870)
Unio (Scalenaria) scalenarius — Mörch (1853)
Pleurobema clava — Vanatta (1915), Ortmann & Walker (1922), Burch (1975), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009), Campbell & Lydeard (2012)

Pleurobema cuneata Rafinesque, 1820
Rafinesque, 1820, Ann. Gén. Sci. Phys. 5 (13): 313 [also as ‘Unio cuneata’].
Rafinesque, 1864, [in] Binney & Tryon, reprint: 56.
Type(s): LECTOTYPE ANSP_20228, Riv. Ohio.

Pleurobema cuneata — Rafinesque (1820)
Unio cuneatus — Ferussac (1835), Reeve (1864)
Unio (Cunicula) cuneata — Swainson (1840)
Unio clava — Conrad (1853)
Pleurobema clava — Vanatta (1915), Ortmann & Walker (1922), Burch (1975), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)
Pleurobema (s.s.) mytiloides — Frierson (1927)

Pleurobema cuneata var. maculata Rafinesque, 1820
Rafinesque, 1820, Ann. Gén. Sci. Phys. 5 (13): 313.
Rafinesque, 1864, [in] Binney & Tryon, reprint: 56.
(intro'd as intra-sp. of Pleurobema cuneata Rafinesque, 1820)

Pleurobema cuneata var. maculata — Rafinesque (1820)

Pleurobema cuneata var. sulcata Rafinesque, 1820
Rafinesque, 1820, Ann. Gén. Sci. Phys. 5 (13): 313.
Rafinesque, 1864, [in] Binney & Tryon, reprint: 56.
(intro'd as intra-sp. of Pleurobema cuneata Rafinesque, 1820)

Pleurobema cuneata var. sulcata — Rafinesque (1820)

Unio (Aximedia) elliptica Rafinesque, 1820
Rafinesque, 1818, Amer. Mon. Mag. 3: 355 [as ‘Potamilus ellipticus’]. [nomen nudum]
Rafinesque, 1820, Ann. Gén. Sci. Phys. 5 (13): 296 [also as ‘Elliptio elliptica’].
Rafinesque, 1864, [in] Binney & Tryon, reprint: 22, 42.
Type(s): LECTOTYPE ANSP_20213, [no locality available - North America].

Unio (Aximedia) elliptica — Rafinesque (1820)
Potamilus ellipticus — Rafinesque (1818)
Obliquaria (Aximedia) elliptica — Rafinesque (1831)
Unio elliptica — Ferussac (1835)
Unio (Limnium sec. Aximedia) ellipticus — Fischer (1887)
Pleurobema clava — Vanatta (1915), Ortmann & Walker (1922), Burch (1975), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)
Obovaria (s.s.) subrotunda — Frierson (1927), Haas (1969)

Unio cuneatus Say, 1834
‘Rafinesque’ Say, 1834, Amer. Conch. 6: ??.
(reference to Pleurobema cuneata Rafinesque, 1820)

Unio cuneatus — Say (1834)
Pleurobema (s.s.) clava — Simpson (1900), Simpson (1914)
Pleurobema clava — Parmalee & Bogan (1998), Watters et al. (2009)

Unio modioliformis Lea, 1834
‘Say’ of Authors.
Lea, 1834, Trans. Amer. Phil. Soc. 5 [O. 1]: 89.
Conrad, 1835, Monogr. Fam. Unionidae 1(1): 5.
Ferussac, 1835, Mag. Zool. 5: 28.
Conrad, 1853, Proc. Acad. Nat. Sci. 6: 246.
(intro'd as syn of Unio clava Lamarck, 1819)

Unio modioliformis — Lea (1834)
Unio scalenia — Lea (1834)
Unio clava — Ferussac (1835), Conrad (1835), Küster (1848), Conrad (1853)
Margarita (Unio) clavus — Lea (1836), Lea (1838)
Unio clavus — Hanley (1843)
Margaron (Unio) clavus — Lea (1852), Lea (1870)
Unio (s.s.) clavus — Call (1900)

Unio mytilloides Conrad, 1834
Conrad, 1834, Amer. J. Sci. 25(2): 343, pl. 1, fig. 7.
(error for Pleurobema mytiloides Rafinesque, 1820)

Unio mytilloides — Conrad (1834)
Pleurobema (s.s.) cor — Simpson (1900), Simpson (1914)

Unio clavus Conrad, 1835
‘Lamarck’ Conrad, 1835, Monogr. Fam. Unionidae 1(1): 5, pl. 3, fig. 1.
(reference to Unio clava Lamarck, 1819)

Unio clavus — Conrad (1835), Hanley (1843)
Margarita (Unio) clavus — Lea (1838)
Unio clava — Küster (1848), Conrad (1853)
Margaron (Unio) clavus — Lea (1852), Lea (1870)
Pleurobema (s.s.) clava — Simpson (1900), Simpson (1914)
Unio (s.s.) clavus — Call (1900)
Pleurobema (s.s.) mytiloides — Frierson (1927)
Pleurobema mytiloides — Modell (1942)

Unio gibbosus Küster, 1848
‘Rafinesque’ Küster, 1848, Conchyl. Cab. 9(2): 40.
(error for Obliquaria (Scalenaria) scalenia Rafinesque, 1820)

Unio gibbosus — Küster (1848)

Unio (Scalenaria) scalenarius Mörch, 1853
‘Raf.’ Mörch, 1853, Cat. Conch. Yoldi 2: 44.
(error for Obliquaria (Scalenaria) scalenia Rafinesque, 1820)

Unio (Scalenaria) scalenarius — Mörch (1853)

Unio consanguineus de Gregorio, 1914
de Gregorio, 1914, Il Nat. Siciliano 2: 46.
(homonym of Unio consanguineus Lea, 1861)

Unio consanguineus — de Gregorio (1914)
Pleurobema clava — Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

Unio anaticulus var. ohiensis de Gregorio, 1914
de Gregorio, 1914, Il Nat. Siciliano 2: 51, pl. 10, figs. 3a-d.
(intro'd as intra-sp. of Unio anaticulus Lea, 1861)

Unio anaticulus var. ohiensis — de Gregorio (1914)
Pleurobema clava — Parmalee & Bogan (1998), Watters et al. (2009)

Pleurobema sintoxia Huang et al., 2019
‘Rafinesque’ Huang et al., 2019, MPE 130: Table S4. [in part]
(misidentified reference to Obliquaria (Sintoxia) sintoxia Rafinesque, 1820)

Pleurobema sintoxia — Huang et al. (2019)

Taxonomic History (since 1900)

Pleurobema (s.s.) clava — Simpson (1900), Simpson (1914)
Unio (s.s.) clavus — Call (1900)
Pleurobema (s.s.) cor — Simpson (1900), Simpson (1914)
Pleurobema (s.s.) bournianus — Simpson (1900)
Pleurobema clava — Ortmann (1909), Ortmann (1909), Ortmann (1909), Ortmann (1910), ..., Graf & Cummings (2021), Johnson et al. (2023), Hopper et al. (2023), Hauck et al. (2023)
Unio patulus — de Gregorio (1914)
Pleurobema (s.s.) bournianum — Simpson (1914)
Unio consanguineus — de Gregorio (1914)
Unio anaticulus var. ohiensis — de Gregorio (1914)
Pleurobema obliqua rubrum — Ortmann (1918)
Pleurobema (s.s.) mytiloides — Frierson (1927), Haas (1930)
Obovaria (s.s.) subrotunda — Frierson (1927), Haas (1969)
Pleurobema (s.s.) clava-patulum — Frierson (1927)
Quadrula (Pleuronaia) cor — Frierson (1927), Haas (1969)
Pleurobema mytiloides — Modell (1942), Haas (1969)
Pleurobema clava clava — Haas (1969)
Pleurobema clava patulus — Haas (1969)
Pleurobema bournianum — Turgeon et al. (1988), Williams et al. (1993), Turgeon et al. (1998), IUCN (2000), Graf & Cummings (2007), Cummings & Graf (2010), ITIS (2012)
Pleurobema sintoxia — Huang et al. (2019)