Unio goascoranensis Lea, 1858
Lea, 1858. Proc. Acad. Nat. Sci. 10: 118.
Lea, 1860. Jour. Acad. Nat. Sci. 4 [O. 7]: 258 [76], pl. 41, fig. 139.
Type(s): LECTOTYPE [AS HOLOTYPE] USNM_85086 (by Johnson & Baker, 1973: 156), Goascoran R., Honduras.

Nephronaias goascoranensis — Simpson (1900), Simpson (1914), Graf & Cummings (2007), Bogan (2010), Graf & Cummings (2021), Czaja et al. (2023), Cummings et al. (2025)
Unio (Sphenonaias) goascoranensis — Martens (1900)
Nephronaias calamitarum — Ihering (1901)
Elliptio (Nephronaias) goascoranensis — Frierson (1927), Haas (1929)
Nephronaias (s.s.) goascoranensis — Haas (1969)

Unio goascoranensis Martens, 1900
Martens, 1900. Biol. Centr.-Amer., Moll.: 501, pl. 38, figs. 10-10a.

Nephronaias goascoranensis — Simpson (1914)
Elliptio (Nephronaias) guatemalensis [sic] — Frierson (1927)

Unio (Elliptio) guatemalanus Martens, 1900
Martens, 1900. Biol. Centr.-Amer., Moll.: 519, pl. 38, figs. 7-8a.
Type(s): LECTOTYPE ZMB_220175 (by Cummings et al., 2025: 260), Rio Michatoya, bei Paso San Antonio, Guatemala.

Unio (Elliptio) guatemalanus — Martens (1900)
Nephronaias goascoranensis — Simpson (1914), Cummings et al. (2025)
Elliptio (Nephronaias) guatemalensis [sic] — Frierson (1927)
Elliptio (Nephronaias) rowellii — Haas (1929)
Nephronaias (s.s.) goascoranensis — Haas (1969)

Unio (Elliptio) radiatulus Martens, 1900
Martens, 1900. Biol. Centr.-Amer., Moll.: 518, pl. 39, figs. 8a-b.
Type(s): LECTOTYPE ZMB_108851 (by Cummings et al., 2025: 260), Rio Michatoya, bei Paso San Antonio, Guatemala.

Unio (Elliptio) radiatulus — Martens (1900)
Nephronaias oregonensis — Simpson (1914)
Elliptio (Nephronaias) oregonensis — Frierson (1927)
Nephronaias (s.s.) oregonensis — Haas (1969)
Nephronaias goascoranensis — Cummings et al. (2025)

Unio (Simonaias) championi Martens, 1900
Martens, 1900. Biol. Centr.-Amer., Moll.: 508, pl. 38, figs. 9-9a.
Type(s): LECTOTYPE ZMB_220174 (by Cummings et al., 2025: 260), Paso San Antonio, in the Pacific Coast Region, Guatemala.

Unio (Simonaias) championi — Martens (1900)
Nephronaias championi — Simpson (1914), Graf & Cummings (2007), Bogan (2010), Graf & Cummings (2021)
Elliptio (Nephronaias) championi — Frierson (1927)
Elliptio (Nephronaias) macnielii — Haas (1929)
Nephronaias (s.s.) championi — Haas (1969)
Nephronaias goascoranensis — Cummings et al. (2025)

Nephronaias lempensis Marshall, 1926
Marshall, 1926. Proc. U.S. Nat. Mus. 69(2638): 4, pl. 2, figs. 4, 6; pl. 3, fig. 4.
Type(s): HOLOTYPE (ORIG. DESIG.) USNM_361764, Rio Lempe at R.R. Bridge, Salvador.

Nephronaias (s.s.) lempensis — Haas (1969)
Nephronaias lempensis — Graf & Cummings (2007), Bogan (2010), Graf & Cummings (2021)
Nephronaias goascoranensis — Cummings et al. (2025)

Unio goascoraensis B.H. Wright, 1888
‘Lea’ B.H. Wright, 1888. Check List N. Amer. Unionidae etc.: [3].

Elliptio (Nephronaias) guatemalensis Frierson, 1927
‘von Martens’ Frierson, 1927. Check List N. Amer. Naiades: 36.