Alasmodonta complanata Barnes, 1823
Barnes, 1823. Amer. J. Sci. 6 (1-2): 278, pl. 13, fig. 22a-b.

Symphynota (Pterosygna [sic]) complanata — Simpson (1900), Simpson (1914)
Unio (Margaritana) complanata — Call (1900)
Symphynota complanata — Ortmann (1909), Ortmann (1910), Ortmann (1912), Utterback (1915)
Symphynota (Pterosygna) [sic] complanata — Ortmann (1909)
Lasmigona (Pterosyna) complanata — Ortmann (1924), Ortmann (1925), Frierson (1927), F.C. Baker (1928), Haas (1969), Haas (1969)
Lasmigona (Pterosygna) [sic] complanata — Haas (1930)
Lasmigona (sec. Pterosyna) complanata — Thiele (1934)
Lasmigona complanata — Murray & Leonard (1962), Clarke (1973), Burch (1975), Heard (1975), Gordon et al. (1979), ... Wu et al. (2024), Hou et al. (2024), Perkins et al. (2025), Hou et al. (2025), Wang et al. (2025)
Lasmigona (s.s.) complanata complanata — Clarke (1985)
Lasmigona complanata complanata — Turgeon et al. (1988), Williams et al. (1993), Turgeon et al. (1998), Lydeard et al. (1999), King et al. (1999), Jones et al. (2005), ITIS (2012), McMurray et al. (2012)
Lasmigona c. complanata — Hoke (2005)
Lasmigona (s.s.) complanata — Graf & Cummings (2007)
Pterosyna complanata — FMCS (2025)

Unio gigas Swainson, 1824
Swainson, 1824. Quart. J. Sci., Lit. & Arts 17: 15.
Swainson, 1840. Treat. Malacol.: 262, 265, 378.

Symphynota (Pterosygna [sic]) complanata — Simpson (1900), Simpson (1914)
Lasmigona (s.s.) complanata complanata — Clarke (1985)
Lasmigona complanata — Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

Unio katherinae Lea, 1838
Lea, 1838. Trans. Amer. Phil. Soc. 6 [O. 2]: 143 [as ‘katherinæ’].
Lea, 1838. Synopsis Fam. Naiades: 35 [as ‘katherinæ’].

Symphynota (Pterosygna [sic]) complanata var. katherinae — Simpson (1900), Simpson (1914)
Lasmigona (Pterosyna) complanata-katherinae — Frierson (1927)
Lasmigona (Pterosyna) complanata katherinae — F.C. Baker (1928)
Lasmigona (Pterosyna) complanata — Haas (1969)
Lasmigona complanata — Clarke (1973), Burch (1975), R.I. Johnson (1980), Strayer & Jirka (1997), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)
Lasmigona (s.s.) complanata complanata — Clarke (1985)

Complanaria gigas Swainson, 1840
Sowerby, 1839. Conch. Man.: 2, fig. 141.
Swainson, 1840. Treat. Malacol.: 288, 382.

Symphynota (Pterosygna [sic]) complanata — Simpson (1900), Simpson (1914)
Lasmigona (Pterosyna) complanata — Frierson (1927), Haas (1969)
Lasmigona (s.s.) complanata complanata — Clarke (1985)
Lasmigona complanata — Parmalee & Bogan (1998), Watters et al. (2009)

Alasmodon complanatus Sowerby, 1839
Sowerby, 1839. Conch. Man.: 2, fig. 141.
(reference to Alasmodonta complanata Barnes, 1823)

Lasmigona complanata — Watters et al. (2009)