species Popenaias metallica (Say, 1831): synonymy

Unio cuprinus Lea, 1831

Lea, 1831. Trans. Amer. Phil. Soc. 4 [O. 1]: 94, pl. 12, fig. 24.
LECTOTYPE [AS HOLOTYPE] USNM_86121 (by R.I. Johnson, 1974: 40), Mexico.

Lampsilis (Proptera) metallicus — Simpson (1900)
Unio (Simonaias) cuprinus — Martens (1900)
Lampsilis (Proptera) (Group of L. metallica) metallica — Simpson (1914)
Elliptio (Popenaias) metallicus — Frierson (1927)
Nephronaias (Popenaias) metallica — Haas (1969)
Popenaias metallica — Cummings et al. (2025)

Unio metallicus Say, 1831

Say, 1831. New Harm. Dissem. 1(29): [no pagination].
Say, 1858. [in] Binney, Compl. Writings T. Say: 133.
TYPE LOST XXX_UNKNOWN, Mexico....Lake Chalco?

Lampsilis (Proptera) metallicus — Simpson (1900)
Unio (Simonaias) cuprinus var. persulcatus — Martens (1900)
Lampsilis (Proptera) (Group of L. metallica) metallica — Simpson (1914)
Elliptio (Popenaias) metallicus — Frierson (1927)
Nephronaias (Popenaias) metallica — Haas (1969)
Popenaias metallica — Graf & Cummings (2007), Bogan (2010), Inoue et al. (2020), Graf & Cummings (2021), Czaja et al. (2023), Cummings et al. (2025)

Unio aereus Reeve, 1865

Reeve, 1865. Conch. Icon. 16: pl. 30, sp. 160.
TYPE LOST XXX_UNKNOWN, unknown.

Lampsilis (Proptera) metallicus — Simpson (1900)
Lampsilis (Proptera) (Group of L. metallica) metallica — Simpson (1914)
Elliptio (Popenaias) metallicus — Frierson (1927)
Nephronaias (Popenaias) metallica — Haas (1969)
Popenaias metallica — Cummings et al. (2025)

Unio cuprinus Sowerby, 1868

(reference to Unio cuprinus Lea, 1831)
‘Lea’ Sowerby, 1868. Conch. Icon. 16: pl. 66, sp. 336.

Unio (Simonaias) cuprinus var. nephritica [sic] — Martens (1900)
Lampsilis (Proptera) metallicus — Simpson (1900)
Lampsilis (Proptera) (Group of L. metallica) metallica — Simpson (1914)

Unio acreus Haas, 1969

(error for Unio aereus Reeve, 1865)
‘Reeve’ Haas, 1969. Das Tierreich 88: 202.