Symphynota compressa Lea, 1829
Lea, 1829. Trans. Amer. Phil. Soc. 3 [O. 1]: 450, pl. 12, fig. 22.
Type(s): LECTOTYPE USNM_83961, Yellow Cr., Cincinnati, Ohio.

Symphynota (s.s.) compressa — Simpson (1900), Simpson (1914)
Symphynota compressa — Ortmann (1909), Ortmann (1909), Ortmann (1910), Ortmann (1912)
Unio compressa — de Gregorio (1914)
Lasmigona (Platynaias) compressa — Ortmann & Walker (1922), F.C. Baker (1928), Clarke (1985), Graf & Cummings (2007)
Lasmigona (Platynaias) viridis — Frierson (1927), Haas (1969)
Lasmigona (sec. Platynaias) compressa — Thiele (1934)
Lasmigona (Platynaias) viridis viridis — Haas (1969)
Lasmigona compressa — Clarke (1973), Burch (1975), Heard (1975), Mathiak (1979), R.I. Johnson (1980), ... Hopper et al. (2023), Dai et al. (2024), Dai et al. (2025), Perkins et al. (2025), Chen et al. (2025)
Platynaias compressa — Wu et al. (2023), Wu et al. (2024), Wu et al. (2024), Hou et al. (2024), FMCS (2025)

Unio compressus var. plebius C.B. Adams, 1842
C.B. Adams, 1842. [in] Thompson, History of Vermont (1): 16.
Type(s): LECTOTYPE MCZ_154361 (by R.I. Johnson, 1956: 130), small brook in Middlebury, Vermont.

Symphynota (s.s.) compressa var. plebius — Simpson (1900)
Symphynota (s.s.) compressa var. plebia — Simpson (1914)
Lasmigona (Platynaias) viridis-plebia — Frierson (1927)
Lasmigona (Platynaias) viridis plebia — Haas (1969)
Lasmigona compressa — Clarke (1973), Burch (1975), Strayer & Jirka (1997), Watters et al. (2009)
Lasmigona (Platynaias) compressa — Clarke (1985)

Margaron (Unio) pressus Lea, 1852
Lea, 1852. Synopsis Fam. Naiades: 19.
Lea, 1870. Synopsis Fam. Naiades: 29.
Type(s): HOLOTYPE USNM_83961, Yellow Cr., Cincinnati, Ohio.

Symphynota (s.s.) compressa — Simpson (1900), Simpson (1914)
Unio (s.s.) pressus — Call (1900)
Lasmigona (Platynaias) viridis — Frierson (1927)
Lasmigona (Platynaias) compressa — F.C. Baker (1928), Clarke (1985)
Lasmigona (Platynaias) viridis viridis — Haas (1969)
Lasmigona compressa — Strayer & Jirka (1997), Watters et al. (2009)

Unio compressa var. lindus de Gregorio, 1914
de Gregorio, 1914. Il Nat. Siciliano 2: 14, pl. 6, figs. 1a-d.

Unio compressa var. lindus — de Gregorio (1914)
Lasmigona (Platynaias) viridis viridis — Haas (1969)
Lasmigona compressa — Watters et al. (2009)

Unio alasmodontina Lea, 1829
‘Barnes’ Lea, 1829. Trans. Amer. Phil. Soc. 3 [O. 1]: 451.

Lasmigona (Platynaias) viridis — Frierson (1927)
Lasmigona (Platynaias) compressa — Clarke (1985)
Lasmigona compressa — Watters et al. (2009)

Complanaria alasmodontina Stimpson, 1851
‘Barnes’ Stimpson, 1851. Shells of New England: 14.

Symphynota (s.s.) compressa — Simpson (1900), Simpson (1914)
Lasmigona (Platynaias) viridis viridis — Haas (1969)
Lasmigona compressa — Watters et al. (2009)

Unio compressus var. plebeius Lea, 1852
‘Adams’ Lea, 1852. Synopsis Fam. Naiades: 19.