Amblema olivaria Rafinesque, 1820
Rafinesque, 1820. Ann. Gén. Sci. Phys. 5 (13): 314 [also as ‘U. olivaria’].
Rafinesque, 1864. [in] Binney & Tryon, reprint: 57.

— Simpson (1900), Simpson (1914)
Obovaria olivaria — Vanatta (1915), Ortmann & Walker (1922), Murray & Leonard (1962), Burch (1975), Gordon et al. (1979), ... Graf & Cummings (2021), Porto-Hannes et al. (2021), FMCS (2021), Hopper et al. (2023), Hauck et al. (2023)
Obovaria (s.s.) olivaria — Ortmann (1924)
Obovaria (Pseudoön) olivaria — Ortmann (1925)
Obovaria (Pseudoon) olivaria — Frierson (1927), F.C. Baker (1928), Haas (1969), Haas (1969), Campbell & Lydeard (2012)
Pseudoon olivarium — Campbell & Lydeard (2012)

Amblema olivaria var. dilatata Rafinesque, 1820
Rafinesque, 1820. Ann. Gén. Sci. Phys. 5 (13): 314.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 57.
(intro'd as intra-sp. of Amblema olivaria Rafinesque, 1820)

Obovaria (Pseudoon) olivaria — Haas (1969)

Amblema olivaria var. fasciolaris Rafinesque, 1820
Rafinesque, 1820. Ann. Gén. Sci. Phys. 5 (13): 314.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 57.
(intro'd as intra-sp. of Amblema olivaria Rafinesque, 1820)

Obovaria (Pseudoon) olivaria — Haas (1969)

Unio brevialis Sowerby & Sowerby, 1821
‘Lamarck’ Sowerby & Sowerby, 1821. Genera of Shells 2: pl. 86, fig. 4.
(misidentified reference to Unio brevialis Lamarck, 1819)

Obovaria (Pseudoon) ellipsis — Simpson (1900), Simpson (1914)
Obovaria (Pseudoon) olivaria — Frierson (1927)
Obovaria olivaria — Parmalee & Bogan (1998), Watters et al. (2009)

Unio ellipsis Lea, 1828
Lea, 1828. Trans. Amer. Phil. Soc. 3 [O. 1]: 268, pl. 4, fig. 4.
Type(s): SYNTYPES ANSP_56614, Ohio River.

Obovaria (Pseudoon) ellipsis — Simpson (1900), Ortmann (1909), Ortmann (1912), Simpson (1914), Thiele (1934)
Unio (s.s.) ellipsis — Call (1900)
Obovaria ellipsis — Ortmann (1909), Ortmann (1910)
Unio ellipsis — de Gregorio (1914)
Obovaria olivaria — Vanatta (1915), Ortmann & Walker (1922), Murray & Leonard (1962), Burch (1975), R.I. Johnson (1980), Oesch (1984), Vidrine (1993), Strayer & Jirka (1997), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)
Obovaria (Pseudoön) ellipsis — Utterback (1916)
Obovaria (Pseudoon) olivaria — Frierson (1927), F.C. Baker (1928), Haas (1969), Haas (1969)
Pseudoon olivarium — Campbell & Lydeard (2012)

Unio olivarius Conrad, 1834
‘Rafinesque’ of Authors.
Conrad, 1834. New Fresh-Water Shells: 70.
Ferussac, 1835. Mag. Zool. 5: 28, 34.
(reference to Amblema olivaria Rafinesque, 1820)

Obovaria (Pseudoon) ellipsis — Simpson (1900), Simpson (1914)
Obovaria olivaria — Watters et al. (2009)

Unio triagularis Say, 1834
Say, 1834. Amer. Conch. 6: ??.
(misidentified reference to Unio triangularis Barnes, 1823)

Obovaria (Pseudoon) ellipsis — Simpson (1900), Simpson (1914)

Diplasma vitrea Potiez & Michaud, 1844
‘Rafinesque, 1831’ Potiez & Michaud, 1844. Galérie Moll. at. Mus. Douai 2: 150, pl. 58, figs. 1-2.
(misidentified reference to Diplasma (Hemisolasma?) vitrea Rafinesque, 1831)

Obovaria (Pseudoon) olivaria — Frierson (1927)
Obovaria olivaria — Parmalee & Bogan (1998), Watters et al. (2009)

Unio pealei Lea, 1871
Lea, 1871. Proc. Acad. Nat. Sci. 23: 191.
Lea, 1874. Jour. Acad. Nat. Sci. 8 [O. 13]: 26 [30], pl. 8, fig. 23.
Type(s): HOLOTYPE (MONOTYPY) USNM_85745, Kansas.

Obovaria (Pseudoon) ellipsis — Simpson (1900), Simpson (1914)
Unio (s.s.) ellipsis — Call (1900)
Obovaria olivaria — Murray & Leonard (1962), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)
Obovaria (Pseudoon) olivaria — Haas (1969)

Unio elipsis Ravenel, 1834
‘Lea’ Ravenel, 1834. Cat. Rec. Shells: 6.
(error for Unio ellipsis Lea, 1828)

Unio taitanus Sowerby, 1868
‘Lea’ Sowerby, 1868. Conch. Icon. 16: pl. 67, sp. 338.
(misidentified reference to Unio taitianus Lea, 1834; error for Unio taitianus Lea, 1834)

Obovaria (Pseudoon) ellipsis — Simpson (1900), Simpson (1914)
Obovaria (Pseudoon) olivaria — Frierson (1927), Haas (1969)
Obovaria olivaria — Parmalee & Bogan (1998), Watters et al. (2009)

Unio pealii B.H. Wright, 1888
‘Lea’ B.H. Wright, 1888. Check List N. Amer. Unionidae etc.: [4].
(error for Unio pealei Lea, 1871)

Unio pearlii Scammon, 1906
‘Lea’ Scammon, 1906. KS Univ. Sci. Bull. 3(9): 305.
(error for Unio pealei Lea, 1871)

Obovaria olivaria — Parmalee & Bogan (1998), Watters et al. (2009)

Unio mytilloides Frierson, 1927
‘Swainson’ Frierson, 1927. Check List N. Amer. Naiades: 91.
(error for Unio (s.s.) mytiloides Swainson, 1840; misidentified reference to Unio (s.s.) mytiloides Swainson, 1840)

Obovaria (Pseudoon) olivaria — Frierson (1927)