Unio umbrosus Lea, 1856
Lea, 1856. Proc. Acad. Nat. Sci. 8: 95.
Lea, 1857. Jour. Acad. Nat. Sci. 3 [O. 6]: 311 [31], pl. 30, fig. 26.
Type(s): HOLOTYPE USNM_84848, Medellin R., Mexico.

Lampsilis (Proptera) umbrosus — Simpson (1900)
Unio (Lampsilis) tampicoensis var. umbrosus — Martens (1900)
Lampsilis umbrosus — Pilsbry (1904)
Lampsilis (Proptera) umbrosa — Simpson (1914)
Lampsilis (Cyrtonaias) umbrosa — Frierson (1927), Haas (1929)
Lampsilis (Cyrtonaias) umbrosa umbrosa — Haas (1969)
Cyrtonaias umbrosa — Contreras-Arquieta (2000), Graf & Cummings (2007), Bogan (2010), Graf & Cummings (2021), Czaja et al. (2023)
Lampsilis umbrosa — Contreras-Arquieta (2000)

Unio veracruzensis Lea, 1868
Lea, 1868. Proc. Acad. Nat. Sci. 20: 150.
Lea, 1868. Jour. Acad. Nat. Sci. 6 [O. 12]: 320 [80], pl. 52, fig. 133.
Type(s): HOLOTYPE (MONOTYPY) USNM_25432, Vera Cruz, Mexico.

Lampsilis (Proptera) umbrosus — Simpson (1900)
Unio (Elliptio) medellinus — Martens (1900)
Lampsilis (Proptera) umbrosa — Simpson (1914)
Lampsilis (Cyrtonaias) umbrosa — Frierson (1927)
Lampsilis (Cyrtonaias) umbrosa umbrosa — Haas (1969)

Unio alienigenus Crosse & Fischer, 1894
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): SYNTYPE MNHN-IM-2000-1634, Coatzacoalcos, Vera Cruz, Mexico.

Lampsilis (Proptera) alienigenus — Simpson (1900)
Unio (Lampsilis) alienigenus — Martens (1900)
Lampsilis (Proptera) alienigena — Simpson (1914)
Lampsilis (Cyrtonaias) alienigena — Frierson (1927)
Lampsilis (Cyrtonaias) umbrosa alienigena — Haas (1969)

Unio (Lampsilis) rovirosai Pilsbry, 1900
Pilsbry, 1900. Nautilus 13: 140.
Pilsbry, 1904. Proc. Acad. Nat. Sci. 55: 788, pl. 54, figs. 1-1a.
Type(s): HOLOTYPE ANSP_58916, Laguna de Atasta, nr. S.J. Bautista, Tabasco, Mex.

Lampsilis (Proptera) rovirosai — Simpson (1900), Simpson (1914)
Lampsilis rovirosai — Pilsbry (1904)
Proptera rovirosai — Frierson (1927), Haas (1969)
Lampsilis revirosai [sic] — Contreras-Arquieta (2000)
Lampsilis rousrosai [sic] — Contreras-Arquieta (2000)
Potamilus rovirosai — Graf & Cummings (2007), Bogan (2010), Czaja et al. (2023)
Cyrtonaias umbrosa — Graf & Cummings (2021)

Lampsilis rovirosai sanjuanensis H.B. Baker, 1922
H.B. Baker, 1922. Occ. Pap. Mus. Zool. Univ. Mich. (106): 27, pl. 8, fig. 39-42.
(intro'd as intra-sp. of Unio (Lampsilis) rovirosai Pilsbry, 1900)
Type(s): HOLOTYPE UMMZ_34890, Rio San Juan, nr Haciendo de Cuatotolapam, Mexico.

Lampsilis (Cyrtonaias) umbrosa — Frierson (1927)
— Haas (1969)

Lampsilis revirosai Contreras-Arquieta, 2000
Contreras-Arquieta, 2000. Mexicoa 2(1): 44.
(error for Unio (Lampsilis) rovirosai Pilsbry, 1900)

Lampsilis rousrosai Contreras-Arquieta, 2000
‘Pilsbry’ Contreras-Arquieta, 2000. Mexicoa 2(1): 44.
(error for Unio (Lampsilis) rovirosai Pilsbry, 1900)