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Unio acutissimus Lea, 1831

Lea, 1831. Trans. Amer. Phil. Soc. 4 [O. 1]: 89 [99], pl. 10, fig. 18.
Type(s): IDIOTYPE MCZ_178887, Alabama River.

Medionidus acutissimus — Simpson (1900), Simpson (1914), Frierson (1927), Haas (1969), Burch (1975), ... Graf & Cummings (2021), FMCS (2021), Hopper et al. (2023), Hauck et al. (2023), FMCS (2025)
Medionidus accutissimus [sic] — Campbell et al. (2005)

Unio rubellinus Lea, 1857

Lea, 1857. Proc. Acad. Nat. Sci. 9: 32.
Lea, 1858. Jour. Acad. Nat. Sci. 4 [O. 6]: 70, pl. 13, fig. 51.
Type(s): HOLOTYPE USNM_84136, Othcaloosa R., Ga.

Medionidus acutissimus — Simpson (1900), Simpson (1914), Frierson (1927), Haas (1969), Burch (1975), R.I. Johnson (1977), Parmalee & Bogan (1998), Williams et al. (2008)

Unio semiplicatus Küster, 1862

Küster, 1862. Conchyl. Cab. 9(2): 279, pl. 94, fig. 4.

Medionidus acutissimus — Simpson (1900), Simpson (1914), Frierson (1927), Haas (1969), R.I. Johnson (1977), Parmalee & Bogan (1998), Williams et al. (2008)

Unio rubellianus Sowerby, 1868

‘Lea’ Sowerby, 1868. Conch. Icon. 16: pl. 90, sp. 490.
(error for Unio rubellinus Lea, 1857)

Medionidus acutissimus — Simpson (1900), Simpson (1914), Parmalee & Bogan (1998)

Medionidus accutissimus Campbell et al., 2005

‘Lea’ Campbell et al., 2005. Invert. Biol. 124(2): 154.
(error for Unio acutissimus Lea, 1831)