Unio aztecorum Philippi, 1847
Philippi, 1847. Z. Malak. 4: 95.
Philippi, 1849. Abbild. Beschr. Conch. 4: 27, pl. 6, fig. 2.

Lampsilis (Proptera) aztecorum — Simpson (1900)
Unio (Nephronaias) aztecorum — Martens (1900)
Nephronaias medellinus — Ihering (1901)
Lampsilis aztecorum — Pilsbry (1910)
Nephronaias aztecorum — Simpson (1914), Contreras-Arquieta (2000), Graf & Cummings (2007), Bogan (2010), Graf & Cummings (2021), Czaja et al. (2023)
Lampsilis (Disconaias) aztecorum — Frierson (1927)
Elliptio (Nephronaias) aztecorum — Haas (1929)
Nephronaias (s.s.) aztecorum — Haas (1969)

Unio strebelii Lea, 1866
Lea, 1866. Proc. Acad. Nat. Sci. 18: 133.
Lea, 1868. Jour. Acad. Nat. Sci. 6 [O. 12]: 318 [78], pl. 51, fig. 131.
Type(s): FIGURED SYNTYPE USNM_85661, Vera Cruz, Mexico.

Nephronaias medellinus — Simpson (1900)
Unio (Nephronaias) aztecorum var. strebeli — Martens (1900)
Lampsilis strebeli — Pilsbry (1910)
Nephronaias medellina — Simpson (1914)
Lampsilis (Disconaias) aztecorum — Frierson (1927)
Elliptio (Nephronaias) aztecorum — Haas (1929)
Nephronaias (s.s.) aztecorum — Haas (1969)

Unio soledadensis Crosse & Fischer, 1893
Crosse & Fischer, 1893. J. de Conch. 41: 111.
Fischer & Crosse, 1894. Miss. Sci. Mexique, Rech. Zool. 2(16): 608, pl. 69, figs. 3-3b.
Type(s): SYNTYPE MNHN-IM-2000-1785, Mexique, La Soledad.

Unio (Nephronaias) aztecorum var. soledadensis — Martens (1900)
Nephronaias soledadensis — Simpson (1914)
Lampsilis (Disconaias) aztecorum — Frierson (1927)
Nephronaias (s.s.) aztecorum — Haas (1969)

Unio aztecorum var. chapalanus Martens, 1900
Martens, 1900. Biol. Centr.-Amer., Moll.: 504, pl. 36, fig. 5-5a.
(intro'd as intra-sp. of Unio aztecorum Philippi, 1847)
Type(s): TYPE ZMB_9106, Lagune de Chapala, Mexico.

Unio (Nephronaias) aztecorum var. chapalanus — Martens (1900)
Nephronaias aztecorum var. chapalanus — Simpson (1914)
Nephronaias (s.s.) aztecorum — Haas (1969)

Nephronaias aztecorum tolimanensis Pilsbry, 1920
Pilsbry, 1920. Proc. Acad. Nat. Sci. 72: 194, fig. 4.
(intro'd as intra-sp. of Unio aztecorum Philippi, 1847)
Type(s): HOLOTYPE ANSP_46195, Toliman, Jalisco [Mexico].

Nephronaias (s.s.) aztecorum — Haas (1969)

Lampsilis (Disconaias) martensi Frierson, 1927
‘Philippi’ Martens, 1900. Biol. Centr.-Amer., Moll.: pl. 37, figs. 1-1a [as ‘Unio aztecorum’].
Frierson, 1927. Check List N. Amer. Naiades: 83, sp. 364.

Lampsilis (Disconaias) martensi — Frierson (1927)
Nephronaias (s.s.) aztecorum — Haas (1969)

Unio impressus Menke, 1830
Menke, 1830. Syn. Method. Moll.: 107. [nomen nudum]

Unio (Nephronaias) aztecorum — Martens (1900)

Unio aztecorum Martens, 1900
‘Philippi’ Martens, 1900. Biol. Centr.-Amer., Moll.: pl. 37, figs. 1-1a. [in part]
(reference to Unio aztecorum Philippi, 1847)

Lampsilis (Disconaias) martensi — Frierson (1927)