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Unio semigranosus Philippi, 1843

von dem Busch in Philippi, 1843. Abbild. Beschr. Conch. 1: 19, pl. 1, figs. 1-3.
Type(s): LECTOTYPE MCZ_152861 (by Cummings et al., 2025: 332), near Tampico, Mexico.

Unio (sec. Elliptio) semigranosus — Simpson (1900), Simpson (1914)
Unio (Psoronaias) semigranosus — Martens (1900)
Quadrula semigranosa — Pilsbry (1910)
Psoronaias semigranosus — Frierson (1917), Frierson (1927), Haas (1930), Goodrich & van der Schalie (1937)
Psoronaias semigranosa — Haas (1929), Graf & Cummings (2007), Bogan (2010), Pfeiffer et al. (2019), Pfeiffer et al. (2019), Inoue et al. (2020), Smith et al. (2020), Graf & Cummings (2021), Czaja et al. (2023), Freeman et al. (2025), Cummings et al. (2025)
Psoronaias semigranosa semigranosa — Haas (1969)

Elliptio herrerae Marshall, 1923

Marshall, 1923. Proc. U.S. Nat. Mus. 63(2485): 1, pl. 1, figs. 6-8; pl. 2, figs. 4-5; pl. 3.
Type(s): HOLOTYPE (ORIG. DESIG.) USNM_347183, Estera del Avileno, Tamaulipas, Mexico.

Psoronaias herrerae — Frierson (1927), Haas (1929), Haas (1930), Haas (1969), Graf & Cummings (2007), Bogan (2010), Graf & Cummings (2021), Czaja et al. (2023)
Elliptio herrerae — Contreras-Arquieta (2000)
Psoronaias semigranosa — Cummings et al. (2025)