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Unio obtusa Cuvier, 1817

‘Desh.’ Cuvier, 1817. Règne Animal 2: pl. 92, pl. 1.

Unio retusa Lamarck, 1819

Lamarck, 1819. Hist. Natur. Anim. sans Vert. 6: 72, sp. 9.
Type(s): HOLOTYPE MNHN_MPL_0043, Habite les rivières de la Nouvelle Ecosse. A. Michaud. [Lives in the rivers of Nova Scotia. A. Michaud."].

Obovaria (s.s.) retusa — Simpson (1900), Simpson (1914), Ortmann (1918), Ortmann (1924), Ortmann (1925), Frierson (1927), Haas (1930), Thiele (1934), Haas (1969), Haas (1969)
Unio (s.s.) retusus — Call (1900)
Obovaria retusa — Ortmann (1909), Ortmann (1909), Ortmann (1910), Ortmann (1912), Vanatta (1915), ... Watters (2018), Graf & Cummings (2021), FMCS (2021), Hopper et al. (2023), FMCS (2025)

Obovaria torsa Rafinesque, 1820

Rafinesque, 1819. Jour. Phys. Chim. Hist. Nat. 88: 427 [as ‘U. (Obovaria) torsa’]. [nomen nudum]
Rafinesque, 1820. Ann. Gén. Sci. Phys. 5 (13): 311, pl. 82, figs. 1-3 [also as ‘Unio torsa’].
Rafinesque, 1864. [in] Binney & Tryon, reprint: 29, 54.
Type(s): NEOTYPE ANSP_20256, Kentucky River.

Obovaria torsa — Simpson (1900), Simpson (1914)
Obovaria retusa — Vanatta (1915), Ortmann & Walker (1922), Burch (1975), Parmalee & Bogan (1998), Graf & Cummings (2007), Williams et al. (2008), Watters et al. (2009)
Obovaria (s.s.) retusa — Frierson (1927), Haas (1969)

Obovaria torsa var. marginata Rafinesque, 1820

Rafinesque, 1820. Ann. Gén. Sci. Phys. 5 (13): 311.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 54.
(intro'd as intra-sp. of Obovaria torsa Rafinesque, 1820)

Unio incurvis Say, 1829

Say, 1829. New Harm. Dissem. 2(19): 293.

Obovaria (s.s.) retusa — Frierson (1927), Haas (1969)

Unio torsus Potiez & Michaud, 1844

‘Rafinesque’ Potiez & Michaud, 1844. Galérie Moll. at. Mus. Douai 2: 149, pl. 57, figs. 1-2.
(reference to Obovaria torsa Rafinesque, 1820)

Obovaria (s.s.) retusa — Simpson (1900), Simpson (1914)
Obovaria retusa — Watters et al. (2009)

Unio cordatus Küster, 1852

‘Rafinesque’ Küster, 1852. Conchyl. Cab. 9(2): 57, pl. 13, fig. 1.
(misidentified reference to Obovaria cordata Rafinesque, 1820)

Quadrula (sec. Fusconaia) obliqua — Simpson (1900)

Unio jorsus de Gregorio, 1914

‘Rafinesque’ de Gregorio, 1914. Il Nat. Siciliano 2: 43, 56.
(error for Obovaria torsa Rafinesque, 1820)