Unio perovatus Conrad, 1834
Conrad, 1834. Amer. J. Sci. 25(2): 338, pl. 1, fig. 3.
Conrad, 1834. New Fresh-Water Shells: 47, pl. 2, fig. 3.
Conrad, 1853. Proc. Acad. Nat. Sci. 6: 254.
Type(s): LECTOTYPE ANSP_129864 (by Johnson & Baker, 1973: 166), [no locality available - North America].

Pleurobema (s.s.) perovata — Simpson (1900)
Pleurobema (s.s.) perovatum — Simpson (1914), Frierson (1927)
Pleurobema perovatum — Haas (1969), Burch (1975), Turgeon et al. (1988), Williams et al. (1993), Parmalee & Bogan (1998), ... Graf & Cummings (2021), FMCS (2021), Morrison et al. (2021), Hopper et al. (2023), Hauck et al. (2023)

Unio nux Lea, 1852
Lea, 1852. Trans. Amer. Phil. Soc. 10 [O. 5]: 283 [39], pl. 24, fig. 43.
Type(s): HOLOTYPE USNM_85316, Alabama R., Ala.

Pleurobema (s.s.) nux — Simpson (1900), Simpson (1914)
— de Gregorio (1914)
Pleurobema (s.s.) perovatum — Frierson (1927)
Pleurobema perovatum — Haas (1969), Parmalee & Bogan (1998), Williams et al. (2008), IUCN (2012)
Pleurobema nux — Burch (1975), ITIS (2012)

Unio johannis Lea, 1859
Lea, 1859. Proc. Acad. Nat. Sci. 11: 171.
Lea, 1860. Jour. Acad. Nat. Sci. 4 [O. 8]: 343 [25], pl. 55, fig. 168.
Type(s): HOLOTYPE USNM_84830, Alabama R., Tuscaloosa, Ala.

Pleurobema (s.s.) johannis — Simpson (1900), Simpson (1914), Frierson (1927)
— de Gregorio (1914)
Pleurobema johannis — Haas (1969), Burch (1975), Turgeon et al. (1988), Williams et al. (1993), Parmalee & Bogan (1998), Turgeon et al. (1998), Lydeard et al. (1999), IUCN (2000), Graf & Cummings (2007), Cummings & Graf (2010), ITIS (2012)
Pleurobema perovatum — Williams et al. (2008), IUCN (2012), Williams et al. (2017), Graf & Cummings (2021)

Unio cinnamomicus Lea, 1861
Lea, 1861. Proc. Acad. Nat. Sci. 13: 39.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 8]: 100 [104], pl. 16, fig. 248.
Type(s): HOLOTYPE USNM_85317, Tombigbee R., Columbus, Miss.

Pleurobema (s.s.) nux — Simpson (1900), Simpson (1914)
Pleurobema (s.s.) perovatum — Frierson (1927)
Pleurobema perovatum — Haas (1969), Williams et al. (2008), IUCN (2012)

Unio concolor Lea, 1861
Lea, 1861. Proc. Acad. Nat. Sci. 13: 40.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 8]: 89 [83], pl. 12, fig. 237.
Type(s): HOLOTYPE USNM_85319, Big Prairie Cr., Perry Co., Ala.

Pleurobema (s.s.) brumbyanus — Simpson (1900)
Unio (s.s.) clavus — Call (1900)
Pleurobema (s.s.) brumbyanum — Simpson (1914)
Pleurobema (s.s.) concolor — Frierson (1927)
Pleurobema concolor — Haas (1969)
Pleurobema perovatum — Parmalee & Bogan (1998), Williams et al. (2008), IUCN (2012)

Unio flavidulus Lea, 1861
Lea, 1861. Proc. Acad. Nat. Sci. 13: 39.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 8]: 97 [101], pl. 15, fig. 245.
Type(s): HOLOTYPE USNM_84719, Columbus, Miss.

Pleurobema (s.s.) flavidulus — Simpson (1900)
Pleurobema (s.s.) flavidulum — Simpson (1914), Frierson (1927)
Pleurobema flavidulum — Haas (1969), Burch (1975), Turgeon et al. (1988), Williams et al. (1993), Turgeon et al. (1998), Lydeard et al. (1999), IUCN (2000), Graf & Cummings (2007), Bogan (2010), Cummings & Graf (2010), ITIS (2012)
Pleurobema perovatum — Parmalee & Bogan (1998), Williams et al. (2008), IUCN (2012), Williams et al. (2017), Graf & Cummings (2021)

Unio interventus Lea, 1861
Lea, 1861. Proc. Acad. Nat. Sci. 13: 60.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 8]: 84 [88], pl. 11, fig. 233.
Type(s): HOLOTYPE USNM_84722, Cahawba R., Ala.

Pleurobema (s.s.) interventus — Simpson (1900)
Unio (s.s.) clavus — Call (1900)
Pleurobema (s.s.) interventum — Simpson (1914), Frierson (1927)
Pleurobema interventum — Haas (1969)
Pleurobema perovatum — Williams et al. (2008), IUCN (2012)

Unio pallidofulvus Lea, 1861
Lea, 1861. Proc. Acad. Nat. Sci. 13: 60.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 8]: 83 [87], pl. 11, fig. 232.
Type(s): HOLOTYPE USNM_84721, Cahawba R., Ala.

Pleurobema (s.s.) interventus — Simpson (1900)
Unio (s.s.) clavus — Call (1900)
Pleurobema (s.s.) interventum — Simpson (1914), Frierson (1927)
Pleurobema interventum — Haas (1969)
Pleurobema perovatum — Williams et al. (2008), IUCN (2012)

Unio placidus Küster, 1862
‘Lea Mss.’ Küster, 1862. Conchyl. Cab. 9(2): 262, pl. 88, fig. 2.

Pleurobema (s.s.) nux — Simpson (1914)

Unio simulans Lea, 1871
Lea, 1871. Proc. Acad. Nat. Sci. 23: 190.
Lea, 1874. Jour. Acad. Nat. Sci. 8 [O. 13]: 18 [22], pl. 5, fig. 15.
Type(s): FIGURED SYNTYPE USNM_84840, Cahawba R., Shelby Co., Ala.

Pleurobema (s.s.) simulans — Simpson (1900), Simpson (1914), Frierson (1927)
Pleurobema simulans — Haas (1969), Burch (1975)
Pleurobema perovatum — Williams et al. (2008), IUCN (2012)
Pleurobema similans [sic] — ITIS (2012)

Unio pinkstoni S.H. Wright, 1897
S.H. Wright, 1897. Nautilus 10(12): 136.
Type(s): LECTOTYPE USNM_149649, Tuscaloosa Riv., Ala.

Pleurobema (s.s.) pinkstoni — Simpson (1900), Simpson (1914)
Pleurobema pinkstoni — Simpson (1900)
Pleurobema (s.s.) concolor — Frierson (1927)
Pleurobema concolor — Haas (1969)
Pleurobema perovatum — Parmalee & Bogan (1998), Williams et al. (2008), IUCN (2012)

Unio cinnamominus Sowerby, 1868
‘Lea’ Sowerby, 1868. Conch. Icon. 16: pl. 83, sp. 436.
(error for Unio cinnamomicus Lea, 1861)

Pleurobema (s.s.) nux — Simpson (1900), Simpson (1914)
Pleurobema perovatum — Parmalee & Bogan (1998)

Pleurobema similans Johnson, 1905
Johnson, 1905. Science 31(537): 590.
ITIS, 2012. ITIS: [web].
(error for Unio simulans Lea, 1871)