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Unio fuscatus Lea, 1843

Lea, 1843. [privately published sheet]: [1].
Lea, 1845. Trans. Amer. Phil. Soc. 9 [O. 4]: 277 [35], pl. 40, fig. 4.
(homonym of Unio (Elliptio) viridis var. fuscata Rafinesque, 1820; renamed Unio rafinesquei Vanatta, 1915)
Type(s): FIGURED SYNTYPE USNM_85243, Black Cr., Fla.

Unio (sec. Elliptio) fuscatus — Simpson (1900), Simpson (1914)
Unio rafinesquei — Vanatta (1915)
Elliptio rafinesquei — Ortmann & Walker (1922)
Elliptio (s.s.) fuscatus — Frierson (1927), Haas (1969)
Elliptio (s.s.) icterina — R.I. Johnson (1970), R.I. Johnson (1972), Burch (1975)
Elliptio occulta — Williams et al. (2011), Williams et al. (2014)

Unio occultus Lea, 1843

Lea, 1843. [privately published sheet]: [1].
Lea, 1845. Trans. Amer. Phil. Soc. 9 [O. 4]: 279 [37], pl. 41, fig. 7.
Type(s): FIGURED SYNTYPE USNM_85247, Lake Monroe, Fla.

Unio (sec. Elliptio) occultus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) occultus — Frierson (1927), Haas (1969)
Elliptio strigosus — Clench & Turner (1956)
Elliptio (s.s.) icterina — R.I. Johnson (1970), R.I. Johnson (1972), Burch (1975)
Elliptio occulta — Williams et al. (2011), Williams et al. (2014), Williams et al. (2017), Graf & Cummings (2021), FMCS (2021), Hopper et al. (2023), MolluscaBase (2024), FMCS (2025)

Unio fryanus B.H. Wright, 1888

B.H. Wright, 1888. Proc. Acad. Nat. Sci. 40: 113, pl. 2, fig. 1.
Type(s): HOLOTYPE USNM_151032, Lake Ashby, Volusia Co., Fla.

Unio (sec. Elliptio) coruscus var. fryanus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) coruscus-fryanus — Frierson (1927)
Elliptio (s.s.) coruscus — Haas (1969)
Elliptio (s.s.) icterina — R.I. Johnson (1970), R.I. Johnson (1972), Burch (1975)
Elliptio occulta — Williams et al. (2011), Williams et al. (2014)

Unio burtchianus S.H. Wright, 1897

S.H. Wright, 1897. Nautilus 10(12): 137.
Type(s): LECTOTYPE USNM_149653, St. Marys Riv., [Nassau Co.]., Florida.

Unio (sec. Elliptio) burtchianus — Simpson (1900), Simpson (1914)
Unio burtchianus — Simpson (1900)
Elliptio (s.s.) lehmani — Frierson (1927)
Elliptio (s.s.) lehmanii — Haas (1969)
Elliptio (s.s.) icterina — R.I. Johnson (1970), R.I. Johnson (1972), Burch (1975)
Elliptio occulta — Williams et al. (2011), Williams et al. (2014)

Unio lehmanii S.H. Wright, 1897

S.H. Wright, 1897. Nautilus 10(12): 138.
Type(s): LECTOTYPE USNM_149650, St. Marys Riv., [Nassau Co.]., Florida.

Unio (sec. Elliptio) lehmanii — Simpson (1900), Simpson (1914)
Unio lehmani — Simpson (1900)
Elliptio (s.s.) lehmani — Frierson (1927)
Elliptio (s.s.) lehmanii — Haas (1969)
Elliptio (s.s.) crassidens crassidens — R.I. Johnson (1970)
Elliptio (s.s.) crassidens — Burch (1975)
Elliptio crassidens — Parmalee & Bogan (1998), Watters et al. (2009)
Elliptio occulta — Williams et al. (2011), Williams et al. (2014)

Unio dispalans B.H. Wright, 1899

B.H. Wright, 1899. Nautilus 13: 50.
Type(s): HOLOTYPE USNM_159986, Suwanee R., Fla.

Unio (sec. Elliptio) dispalans — Simpson (1900), Simpson (1914)
Unio dispalans — Simpson (1900)
Elliptio (Uniomerus) dispalans — Frierson (1927)
Uniomerus dispalans — Haas (1969)
Elliptio (s.s.) icterina — R.I. Johnson (1970), R.I. Johnson (1972), Burch (1975)
Elliptio occulta — Williams et al. (2011), Williams et al. (2014)

Unio rafinesquei Vanatta, 1915

Vanatta, 1915. Proc. Acad. Nat. Sci. 67: 559.
(new name for Unio fuscatus Lea, 1843)

Unio rafinesquei — Vanatta (1915)
Elliptio rafinesquei — Ortmann & Walker (1922)
Elliptio (s.s.) icterina — Burch (1975)
Elliptio occulta — Williams et al. (2014)

Unio accultus Clench & Turner, 1956

‘Lea’ Clench & Turner, 1956. Bull. Fla. State Mus. 1: 166.
(error for Unio occultus Lea, 1843)

Unio lehmanni Watters et al., 2009

‘Wright’ Watters et al., 2009. Freshw. Mussels OH: 82.
(error for Unio lehmanii S.H. Wright, 1897)