Bivalvia | ... | Unionoidea | Unionidae | Ambleminae | Popenaiadini | Sphenonaias plexus

Lea, 1836. Synopsis Fam. Naiades: 19. [nomen nudum]
Lea, 1838. Trans. Amer. Phil. Soc. 6 [O. 2]: 37, pl. 11, fig. 32.
Type(s): LECTOTYPE [AS HOLOTYPE] USNM_84080A (by Johnson & Baker, 1973: 150), River Medellin, Vera Cruz, Mexico.
+ Sphenonaias plexus (Conrad, 1838) — Cummings et al., 2025
+ Barynaias plexus (Conrad, 1838) — Haas, 1969
+ Psoronaias plexus (Conrad, 1838) — Frierson, 1927
+ Unio (sec. Elliptio) plexus Conrad, 1838 — Simpson, 1914
+ Unio (sec. Elliptio) plexus Conrad, 1838 — Simpson, 1900
= Unio (Elliptio) pliciferus var. carbonarius Lea, 1838 — Martens, 1900
+ Unio (Psoronaias) pliciferus Lea, 1836 — Fischer & Crosse, 1894
+ Margaron (Unio) pliciferus (Lea) — Lea, 1870
+ Unio pliciferus Lea, 1838 — Sowerby, 1868
+ Unio plexus Con., 1836 — Conrad, 1853
+ Margaron (Unio) pliciferus (Lea) — Lea, 1852
= Unio carbonarius Lea — Hanley, 1843
= Margarita (Unio) carbonarius Lea — Lea, 1838
= Margarita (Unio) carbonarius — Lea, 1836