Unio aztecorum Philippi, 1847
Philippi, 1847. Zeitschr. f. Malakozool. 4(6): 95.
Philippi, 1849. Abbild. Beschr. Conch. 4: 27, pl. 6, fig. 2.
Type(s): TYPE LOST XXX_UNKNOWN, Mexico.

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), Cummings et al. (2025)
Lampsilis (Disconaias) aztecorum — Frierson (1927)
Elliptio (Nephronaias) aztecorum — Haas (1929)
Nephronaias (s.s.) aztecorum — Haas (1969)

Unio plicatulus Küster, 1856
‘Charpentier mss.’ Küster, 1856. Conchyl. Cab. 9(2): 154, pl. 44, fig. 4.
Type(s): TYPE LOST XXX_UNKNOWN, Mexico.

Nephronaias plicatulus — Simpson (1900), Frierson (1917)
Unio (Nephronaias) aztecorum — Martens (1900)
Nephronaias tabascoensis — Ihering (1901)
Nephronaias plicatula — Simpson (1914), Graf & Cummings (2007), Bogan (2010), Graf & Cummings (2021), Czaja et al. (2023)
Elliptio (Nephronaias) plicatulus — Frierson (1927)
Elliptio (Nephronaias) aeruginosus — Haas (1929)
Elliptio (sec. Nephronaias) plicatula — Thiele (1934)
Nephronaias (s.s.) plicatula — Haas (1969), Haas (1969)
Nephronaias aztecorum — Cummings et al. (2025)

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): LECTOTYPE [AS HOLOTYPE] USNM_85661 (by R.I. Johnson, 1974: 138), 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)
Nephronaias aztecorum — Cummings et al. (2025)

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): LECTOTYPE MNHN_IM-2000-1785 (by Cummings et al., 2025: 234), 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)
Nephronaias aztecorum — Cummings et al. (2025)

Unio aztecorum Martens, 1900
‘Philippi’ Martens, 1900. Biol. Centr.-Amer., Moll.: pl. 37, figs. 2-2a. [in part]
(reference to Unio aztecorum Philippi, 1847)

Nephronaias aztecorum — Simpson (1914)
Lampsilis (Disconaias) purpuriata — Frierson (1927)

Unio aztecorum “forma” major Martens, 1900
Martens, 1900. Biol. Centr.-Amer., Moll.: pl. 37, figs. 3-3b.
(intro'd as intra-sp. of Unio aztecorum Philippi, 1847; homonym of Unio (Anodontes) sirionos var. major d’Orbigny, 1835)
Type(s): HOLOTYPE (MONOTYPY) ZMB/MOLL_220172, Misantlla, Mexico.

Unio (Nephronaias) aztecorum — Martens (1900)
Lampsilis (Disconaias) fimbriata — Frierson (1927)
Nephronaias aztecorum — Cummings et al. (2025)

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.
Type(s): HOLOTYPE (MONOTYPY) ZMB/MOLL_220183, Misantlla, Mexico.

Lampsilis (Disconaias) martensi — Frierson (1927)
Nephronaias (s.s.) aztecorum — Haas (1969)
Nephronaias aztecorum — Cummings et al. (2025)

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

Unio (Nephronaias) aztecorum — Martens (1900)
— Cummings et al. (2025)

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)

Unio strebeli Pilsbry, 1910
‘Lea’ Pilsbry, 1910. Proc. Acad. Nat. Sci. 61: 533.
(reference to Unio strebelii Lea, 1866)

Lampsilis (Disconaias) pilsbryana — Frierson (1927)
Lampsilis (Disconaias) purpuriata — Haas (1929)