species Platynaias compressa (Lea, 1829): synonymy

Symphynota compressa Lea, 1829

(renamed Margaron (Unio) pressus Lea, 1852)
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)
“Lasmigona compressa” ** — Graf & Ó Foighil (2000), Graf & Cummings (2006), Jadhav & Jamkhedkar (2009), Hoeh et al. (2009), Whelan et al. (2011), ... Wu et al. (2023), Chen et al. (2023), Liu et al. (2023), Dai 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), Hou et al. (2025), Wang et al. (2025), Campbell & Lydeard (2026), Wu et al. (2026), Wu et al. (2026)

Unio compressus var. plebius C.B. Adams, 1842

(intro'd as intra-sp. of Symphynota compressa Lea, 1829)
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

(new name for Symphynota compressa Lea, 1829)
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

(intro'd as intra-sp. of Symphynota compressa Lea, 1829)
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

(intro'd as syn of Symphynota compressa 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

(reference to Unio alasmodontina Lea, 1829)
‘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

(error for Unio compressus var. plebius C.B. Adams, 1842)
‘Adams’ Lea, 1852. Synopsis Fam. Naiades: 19.