Unio obliqua Lamarck, 1819
Lamarck, 1819. Hist. Natur. Anim. sans Vert. 6: 72, sp. 8.
Type(s): HOLOTYPE MNHN_MPL_0041, Wabash.

Quadrula (sec. Fusconaia) obliqua — Simpson (1900), Simpson (1914)
Unio (s.s.) obliquus — Call (1900)
Quadrula obliqua — Ortmann (1909), Ortmann (1909), Vanatta (1915)
Pleurobema obliqua — Ortmann (1910), Ortmann (1918)
Pleurobema obliquum — Ortmann (1912), Utterback (1915), Morrison (1969)
Pleurobema cordata — Ortmann & Walker (1922)
Quadrula (Obliquata) cordata cordata — Haas (1969)
Pleurobema cordatus — R.I. Johnson (1969)
— Burch (1975)
Pleurobema cordatum — R.I. Johnson (1980), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

Obovaria cordata Rafinesque, 1820
Rafinesque, 1820. Ann. Gén. Sci. Phys. 5 (13): 312, pl. 82, figs. 6-7 [also as ‘Unio cordata’].
Rafinesque, 1864. [in] Binney & Tryon, reprint: 55.
Type(s): LECTOTYPE ANSP_20221, Ohio River.

Obovaria cordata — Simpson (1900), Simpson (1914)
Quadrula cordata — Vanatta (1915)
Pleurobema obliqua cordatum — Ortmann (1918)
Pleurobema cordata — Ortmann & Walker (1922), Davis & Fuller (1981)
Pleurobema cordatum — Ortmann (1924), Ortmann (1925), Burch (1975), Mathiak (1979), R.I. Johnson (1980), ... Inoue et al. (2018), Klymus et al. (2020), Graf & Cummings (2021), FMCS (2021), Hopper et al. (2023)
Quadrula (Obliquata) cordata — Frierson (1927), Haas (1930)
Quadrula (Obliquata) cordata cordata — Haas (1969)
Pleurobema obliquum — Morrison (1969)
Pleurobema (Sintoxia) cordatum — Campbell & Lydeard (2012), Campbell & Lydeard (2012), Burlakova et al. (2012)
Pleurobema cordatum cordatum — ITIS (2012)

Obovaria cordata var. rosea Rafinesque, 1820
Rafinesque, 1820. Ann. Gén. Sci. Phys. 5 (13): 312.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 56.
(intro'd as intra-sp. of Obovaria cordata Rafinesque, 1820; homonym of Obovaria striata var. rosea Rafinesque, 1820)

Pleurobema cordatum — Williams et al. (2008), Watters et al. (2009)

Unio obliquus Call, 1900
‘Lamarck’ of Authors.
Call, 1900. Ind. Dept. Geol. Nat. Res. (1899): 501, pl. 57.
Ortmann, 1912. Ann. Carnegie Mus. 8: 264.
(reference to Unio obliqua Lamarck, 1819)

Pleurobema obliquum — Utterback (1915)
Quadrula (Obliquata) cordata — Frierson (1927)
Pleurobema cordatum — Watters et al. (2009)

Unio trigonus of Authors, unknown year
Say. Con. non Lea of Authors.
(misidentified reference to Unio trigonus Lea, 1831)

Unio mytiloides Short & Eaton, 1831
‘Rafinesque’ Short & Eaton, 1831. Transylvania J. Med. Assoc. Sci. 1831: 74.
(misidentified reference to Pleurobema mytiloides Rafinesque, 1820)

Quadrula (sec. Fusconaia) obliqua — Simpson (1900), Simpson (1914)
Quadrula (Obliquata) cordata — Frierson (1927)
Pleurobema cordatum — Parmalee & Bogan (1998), Watters et al. (2009)

Fusconaia flava Burdick & White, 2007
‘Rafinesque’ Burdick & White, 2007. J. Moll. Studies 73: 371.
(misidentified reference to Obliquaria (Quadrula) flava Rafinesque, 1820)

Pleurobema (Sintoxia) cordatum — Campbell & Lydeard (2012)
Pleurobema cordatum — Inoue et al. (2018)