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

Pleurobema (s.s.) clava — Simpson (1900), Simpson (1914)
Unio (s.s.) clavus — Call (1900)
Pleurobema clava — Ortmann (1909), Ortmann (1909), Ortmann (1909), Ortmann (1910), Ortmann (1912), ... FMCS (2021), Morrison et al. (2021), Johnson et al. (2023), Hopper et al. (2023), Hauck et al. (2023)
Pleurobema (s.s.) mytiloides — Frierson (1927)
Pleurobema mytiloides — Modell (1942)
Pleurobema clava clava — 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.

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.

— Simpson (1900), Simpson (1914)
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 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].

— Simpson (1900), Simpson (1914)
Pleurobema clava — Vanatta (1915), Ortmann & Walker (1922), F.C. Baker (1928), Thiele (1934), Heard & Guckert (1970), Burch (1975), Parmalee & Bogan (1998), Graf & Cummings (2007), 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 mytiloides — Modell (1942), Haas (1969)
Pleurobema clava clava — Haas (1969)

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. 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)

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].

— Simpson (1900), Simpson (1914)
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 patulus Lea, 1829
Lea, 1829. Trans. Amer. Phil. Soc. 3 [O. 1]: 441, pl. 12, fig. 20.
Type(s): HOLOTYPE USNM_84760, Ohio ?

Pleurobema (s.s.) clava — Simpson (1900), Simpson (1914)
Unio (s.s.) clavus — Call (1900)
Unio patulus — de Gregorio (1914)
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)

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 (s.s.) clavus — Call (1900)
— Simpson (1914)

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

Pleurobema (s.s.) cor — Simpson (1900), Simpson (1914)

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.

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)

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

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)

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

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

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

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

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)