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Unio recta Lamarck, 1819

Lamarck, 1819. Hist. Natur. Anim. sans Vert. 6: 74, sp. 19.
Type(s): HOLOTYPE MNHN_MPL_0016, Habite le Lac Erié. Michaud. [Lives in Lake Erie. Michaud].

Lampsilis (sec. Eurynia) rectus — Simpson (1900)
Unio (s.s.) rectus — Call (1900)
Lampsilis recta — Ortmann (1909), Ortmann (1909), Ortmann (1909), Ortmann (1910), R.I. Johnson (1969)
Eurynia (s.s.) recta — Ortmann (1912), Utterback (1916), Ortmann (1918)
Lampsilis (Eurynia) recta — Simpson (1914)
Lampsilis rectus — Vanatta (1915)
Ligumia recta — Ortmann & Walker (1922), Haas (1969), Clarke (1973), Burch (1975), Gordon et al. (1979), ... FMCS (2021), Hnytka et al. (2022), Hopper et al. (2023), Hauck et al. (2023), FMCS (2025)
Lampsilis (Ligumia) recta — Frierson (1927), Haas (1930)
Ligumia (s.s.) recta — F.C. Baker (1928), Thiele (1934)
Unio rectus — Henderson (1935)
Ligumia recta recta — Haas (1969)

Unio (Eurynia) latissima Rafinesque, 1820

Rafinesque, 1818. Amer. Mon. Mag. 3: 355 [as ‘Potamilus latissimus’]. [nomen nudum]
Rafinesque, 1819. Jour. Phys. Chim. Hist. Nat. 88: 426. [nomen nudum]
Rafinesque, 1820. Ann. Gén. Sci. Phys. 5 (13): 297, pl. 80, figs. 14-15 [also as ‘Ellipto latissima’].
Rafinesque, 1864. [in] Binney & Tryon, reprint: 22, 29, 42.
Type(s): LECTOTYPE ANSP_20212, Ohio River.

Lampsilis (sec. Eurynia) rectus — Simpson (1900)
Lampsilis (Eurynia) recta — Simpson (1914)
Lampsilis rectus — Vanatta (1915)
Ligumia recta latissima — Ortmann & Walker (1922), Ortmann (1924), Ortmann (1925), Murray & Leonard (1962), Haas (1969)
Lampsilis (Ligumia) recta-latissima — Frierson (1927)
Ligumia (s.s.) recta latissima — F.C. Baker (1928)
Ligumia recta — Clarke (1973), Burch (1975), R.I. Johnson (1980), Oesch (1984), Strayer & Jirka (1997), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009), IUCN (2017)
Ligumia latissima — ITIS (2012)

Unio praelongus Barnes, 1823

Barnes, 1823. Amer. J. Sci. 6 (1-2): 261, pl. 13, fig. 11 [as ‘prælongus’].

Lampsilis (sec. Eurynia) rectus — Simpson (1900)
Lampsilis (Eurynia) recta — Simpson (1914)
Eurynia (s.s.) recta — Utterback (1916)
Lampsilis (Ligumia) recta-latissima — Frierson (1927)
Ligumia (s.s.) recta latissima — F.C. Baker (1928)
Ligumia recta latissima — Haas (1969)
Ligumia recta — Oesch (1984), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009), IUCN (2017)

Unio sageri Conrad, 1836

Conrad, 1836. Monogr. Fam. Unionidae 1(6): 53, pl. 29, fig. 1.

Lampsilis (sec. Eurynia) rectus — Simpson (1900)
Lampsilis (Eurynia) recta var. sageri — Simpson (1914)
Ligumia recta — Ortmann & Walker (1922), Burch (1975), R.I. Johnson (1980), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009), IUCN (2017)
Lampsilis (Ligumia) recta — Frierson (1927)
Ligumia (s.s.) recta — F.C. Baker (1928)
Ligumia recta recta — Haas (1969)

Unio arquatus Conrad, 1854

Conrad, 1854. Jour. Acad. Nat. Sci. 2(4): 297, pl. 26, fig. 8.

Lampsilis (sec. Eurynia) rectus — Simpson (1900)
Lampsilis (Eurynia) recta — Simpson (1914)
Ptychobranchus (s.s.) fasciolare-arquatum — Frierson (1927)
Ptychobranchus (s.s.) fasciolaris — Haas (1969)
Ligumia recta — Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)
Ptychobranchus fasciolaris — Parmalee & Bogan (1998), Watters et al. (2009)

Unio leprosus Miles, 1861

Miles, 1861. Biann. Rept. Geol. Survey Michigan 1: 240.
Type(s): SYNTYPE ANSP_42392, Huron River, Mich.

Lampsilis (Eurynia) recta — Simpson (1914)
Lampsilis (Ligumia) recta-latissima — Frierson (1927)
Ligumia recta latissima — Haas (1969)
Ligumia recta — Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

Unio rectoides Whitfield, 1885

Whitfield, 1885. U.S. Geol. Surv. Mon. 9: 250, pl. 32, figs. 1-2.

Unio rectus — Henderson (1935)

Unio angustatus var. cuniculus de Gregorio, 1914

de Gregorio, 1914. Il Nat. Siciliano 2: 52, pl. 10, fig. 1a-d.
(intro'd as intra-sp. of Unio angustatus Lea, 1831)

Unio angustatus var. cuniculus — de Gregorio (1914)
Ligumia recta — Watters et al. (2009)

Unio proelongus Ferussac, 1835

‘Barnes’ Ferussac, 1835. Mag. Zool. 5(59-60): 27.
(error for Unio praelongus Barnes, 1823)

Unio rectus Conrad, 1836

Conrad, 1836. Monogr. Fam. Unionidae 1(3): 33, pl. 55.
(reference to Unio recta Lamarck, 1819)

Ligumia recta latissima — Ortmann & Walker (1922)
Ligumia recta — Watters et al. (2009)