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Unio dysonii Lea, 1859

Lea, 1859. Proc. Acad. Nat. Sci. 11: 152.
Lea, 1860. Jour. Acad. Nat. Sci. 4 [O. 7]: 252 [70], pl. 39, fig. 132.
Type(s): HOLOTYPE (MONOTYPY) BMNH_1965173, Honduras.

Nephronaias dysonii — Simpson (1900), Simpson (1914), Graf & Cummings (2007), Bogan (2010), Graf & Cummings (2021), Cummings et al. (2025)
Unio (Simonaias) dysoni — Martens (1900)
Nephronaias dysoni — Frierson (1917), Pilsbry (1920)
Elliptio (Nephronaias) dysoni — Frierson (1927)
Elliptio (Nephronaias) dysonii — Haas (1929)
Nephronaias (s.s.) dysonii — Haas (1969)

Elliptio (Nephronaias) sajensis Frierson, 1927

Frierson, 1927. Check List N. Amer. Naiades: 37, sp. 139.
Frierson, 1928. Nautilus 41(4): 139, pl. 2, fig. 2.
Type(s): LECTOTYPE [AS HOLOTYPE] UMMZ_108010, Rio Saja, 5 mi W Esmeralda, Guatemala.

Elliptio (Nephronaias) sajensis — Frierson (1927)
Nephronaias (s.s.) sajensis — Haas (1969)
Nephronaias sajensis — Graf & Cummings (2007), Bogan (2010), Graf & Cummings (2021)
Nephronaias dysonii — Cummings et al. (2025)