Bivalvia | ... | Unionoidea | Unionidae | Ambleminae | Lampsilini | Mesonaias umbrosa

nominal species Unio alienigenus Crosse & Fischer, 1894

Unio alienigenus Crosse & Fischer, 1894 = Mesonaias umbrosa

Crosse & Fischer, 1894. J. de Conch. 41: 294.
Fischer & Crosse, 1894. Miss. Sci. Mexique, Rech. Zool. 2(16): 590, pl. 65, figs. 5-5a; pl. 66, fig. 3.
Type(s): LECTOTYPE MNHN_IM-2000-1634 (by Cummings et al., 2025: 207), Coatzacoalcos, Vera Cruz, Mexico.

Taxonomic Opinions

+ Mesonaias umbrosa (Lea, 1856) — Cummings et al., 2025: 207, pl. 37 bottom.

= Lampsilis (Cyrtonaias) umbrosa alienigena (Crosse & Fischer, 1893) — Haas, 1969: 465.

= Lampsilis (Cyrtonaias) alienigena (Crosse & Fischer, 1893) — Frierson, 1927: 85, sp. 389a.

= Lampsilis (Proptera) alienigena (Crosse & Fischer, 1893) — Simpson, 1914: 178.

= Lampsilis (Proptera) alienigenus (Crosse & Fischer, 1893) — Simpson, 1900: 572.

= Unio (Lampsilis) alienigenus Crosse & Fischer, 1893 — Martens, 1900: 513, pl. 35, figs. 2-2a.

= Unio (Cyrtonaias) alienigenus Crosse & Fischer, 1893 — Fischer & Crosse, 1894: 590, pl. 65, figs. 5-5a; pl. 66, fig. 3.