Mya complanata Lightfoot, 1786
Lister, 1685. Conch.: pl. 150, fig. 5.
Lightfoot, 1786. Catalogue of the Portland Museum: 100, no. 2190.
‘Solander’s MSS.’ Dillwyn, 1817. Descr. Cat. Rec. Shells 1: 51.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Unio complanatus — Ortmann (1909), Ortmann (1909), Ortmann (1910), Walker (1918)
Elliptio complanatus — Ortmann (1911), Ortmann & Walker (1922), F.C. Baker (1928)
— de Gregorio (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)
Elliptio complanata — Clarke (1973), Mathiak (1979), R.I. Johnson (1980), Mackie et al. (1980), Davis & Fuller (1981), ... Wu et al. (2024), Dai et al. (2025), Chen et al. (2025), FMCS (2025), Campbell & Lydeard (2026)
“L.” complanata — Marshall et al. (2018)

Unio violaceus Spengler, 1793
Spengler, 1793. Skr. Naturhist. Selsk. 3: 55, no. 22.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Unio complanatus — Walker (1918)
Elliptio complanatus — Ortmann & Walker (1922)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio purpureus Say, 1817
Say, 1817. Nich. Encyc. 2: [12,] pl. 3, fig. 1.
Say, 1819. Nich. Encyc. 4: [17,] pl. 3, fig. 1.
Say, 1858. [in] Binney, Compl. Writings T. Say: 50.
(renamed Unio purpurascens Lamarck, 1819)

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio carinifera Lamarck, 1819
Lamarck, 1819. Hist. Natur. Anim. sans Vert. 6: 74, sp. 16.
Type(s): HOLOTYPE MNHN_MPL_0012, Habite la rivière Hudson de l’etat de New-Yorck [Lives in the Hudson River, New York].

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio complanata — R.I. Johnson (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio coarctata Lamarck, 1819
Lamarck, 1819. Hist. Natur. Anim. sans Vert. 6: 73, sp. 11.
Type(s): HOLOTYPE MNHN_MPL_0005, [Habite la rivière d’Hudson [New York].

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio complanata — R.I. Johnson (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio georgina Lamarck, 1819
Lamarck, 1819. Hist. Natur. Anim. sans Vert. 6: 74, sp. 17.
Type(s): HOLOTYPE MNHN_MPL_0013, Habite le lac George.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio complanata — R.I. Johnson (1969), Strayer & Jirka (1997)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio glabrata Lamarck, 1819
Lamarck, 1819. Hist. Natur. Anim. sans Vert. 6: 75, sp. 21.
Type(s): HOLOTYPE MNHN_MPL_0021, Habite la rivière de l’Ohio. Michaud.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio complanata — R.I. Johnson (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio purpurascens Lamarck, 1819
Lamarck, 1819. Hist. Natur. Anim. sans Vert. 6: 73, sp. 12.
(new name for Unio purpureus Say, 1817)
Type(s): PARATYPE MNHN_MPL_0008, Habite les rivières de l’etat de New-Yorck [Lives in the rivers of the State of New York ].

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio complanata — R.I. Johnson (1969), Strayer & Jirka (1997), Campbell & Lydeard (2012)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio rarisulcata Lamarck, 1819
Lamarck, 1819. Hist. Natur. Anim. sans Vert. 6: 72, sp. 10.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)
Elliptio complanata — Strayer & Jirka (1997)

Unio rhombula Lamarck, 1819
Lamarck, 1819. Hist. Natur. Anim. sans Vert. 6: 74, sp. 15.
Type(s): POSSIBLE SYNTYPE MNHN_MPL_0011, La variété [b] vient de la rivière Hudson des Etas-Unis [The [b] variety comes from the Hudson River of the United States].

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)
Elliptio complanata — Strayer & Jirka (1997)

Unio sulcidens Lamarck, 1819
Lamarck, 1819. Hist. Natur. Anim. sans Vert. 6: 77, sp. 30.
Type(s): HOLOTYPE MNHN_MPL_0029, Connecticut.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio virginiana Lamarck, 1819
Lamarck, 1819. Hist. Natur. Anim. sans Vert. 6: 79, sp. 39.

Lampsilis (sec. Eurynia) radiatus — Simpson (1900)
Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Lampsilis (Eurynia) radiata — Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Lampsilis (Ligumia) radiata — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio (Elliptio) aurata Rafinesque, 1820
Rafinesque, 1818. Amer. Mon. Mag. 3: 355 [as ‘Potamilus auratus’]. [nomen nudum]
Rafinesque, 1820. Ann. Gén. Sci. Phys. 5 (13): 295.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 22, 40.

— Vanatta (1915)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)
Elliptio complanata — Strayer & Jirka (1997)

Unio fluviatilis Green, 1827
Green, 1827. Contrib. Maclurian Lyceum 1: 41.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)
Elliptio complanata — Strayer & Jirka (1997)

Unio rigidus Wood, 1828
Wood, 1828. Suppl. Index Testac.: 3 [as ‘Mya rigida’].
Wood, 1828. Suppl. Index Testac.: 57, pl. 1, sp. 10.
Wood & Hanley, 1856. Index Testac.: 200.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio griffithianus Lea, 1834
Lea, 1834. Trans. Amer. Phil. Soc. 5 [O. 1]: 103, pl. 15, fig. 46.
Type(s): HOLOTYPE USNM_85610, S.C.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio subinflatus Conrad, 1835
Conrad, 1835. New Fresh-Water Shells, Appendix: 5, pl. 9, fig. 2.
Conrad, 1838. Monogr. Fam. Unionidae 2(11): 97, pl. 54, fig. 1.
Conrad, 1853. Proc. Acad. Nat. Sci. 6: 258.
Type(s): SYNTYPE ANSP_119985, Augusta, Ga.

Unio (sec. Elliptio) subinflatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus-subinflatus — Frierson (1927)
Elliptio (s.s.) violaceus subinflatus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio jejunus Lea, 1838
Lea, 1836. Synopsis Fam. Naiades: 30. [nomen nudum]
Lea, 1838. Trans. Amer. Phil. Soc. 6 [O. 2]: 9, pl. 4, fig. 9.
Type(s): HOLOTYPE USNM_85475, near Camden, S.C.

Unio (sec. Elliptio) complanatus var. jejunus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus-jejunus — Frierson (1927)
Elliptio (s.s.) violaceus jejunus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio fuliginosus Lea, 1845
Lea, 1845. Proc. Amer. Phil. Soc. 4: 164.
Lea, 1848. Trans. Amer. Phil. Soc. 10 [O. 4]: 78 [52], pl. 7, fig. 19.
Type(s): HOLOTYPE USNM_85665, Cobbs Cr., near Phil, Pennsylvania.

Unio (sec. Elliptio) complanatus — Simpson (1900)
Unio (sec. Elliptio) icterinus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio cuvierianus Lea, 1852
Lea, 1852. Trans. Amer. Phil. Soc. 10 [O. 5]: 263 [19], pl. 16, fig. 16.
Lea, 1852. Proc. Amer. Phil. Soc. 5: 251. [nomen nudum]
Type(s): HOLOTYPE USNM_85401, Washington Co., Ga.

Unio (sec. Elliptio) icterinus — Simpson (1900)
Unio (sec. Elliptio) cuvierianus — Simpson (1914)
Elliptio (s.s.) complanatus-cuvierianus — Frierson (1927)
Elliptio (s.s.) violaceus cuvierianus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio abbevillensis Lea, 1857
Lea, 1857. Proc. Acad. Nat. Sci. 9: 84.
Lea, 1858. Jour. Acad. Nat. Sci. 4 [O. 6]: 51 [51], pl. 6, fig. 34.
Type(s): HOLOTYPE USNM_85583, Newmarket (Abbeville District) S. Carolina.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio catawbensis Lea, 1857
Lea, 1857. Proc. Acad. Nat. Sci. 9: 104.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 8]: 54 [58], pl. 1, fig. 200.
(new name for Unio wheatleyi Lea, 1857)
Type(s): HOLOTYPE USNM_85547, Catawba R., N.C.

Unio (sec. Elliptio) catawbensis — Simpson (1900)
Unio (sec. Elliptio) rostrum — Simpson (1914)
— de Gregorio (1914)
Elliptio (s.s.) complanatus-catawbensis — Frierson (1927)
Elliptio (s.s.) violaceus wheatleyi — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)
Elliptio complanata — Bieler (2021)

Unio contractus Lea, 1857
Lea, 1857. Proc. Acad. Nat. Sci. 9: 86.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 9]: 203 [25], pl. 29, fig. 272.
Type(s): HOLOTYPE USNM_86102, Roanoke R., Weldon, N.C.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) errans — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio geminus Lea, 1857
Lea, 1857. Proc. Acad. Nat. Sci. 8: 262.
Lea, 1858. Jour. Acad. Nat. Sci. 4 [O. 6]: 63, pl. 10, fig. 45.
Type(s): HOLOTYPE USNM_84856, Buckhead Cr., Burke Co., Ga.

Unio (sec. Elliptio) geminus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) geminus — Frierson (1927), Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio insulsus Lea, 1857
Lea, 1857. Proc. Acad. Nat. Sci. 9: 86.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 8]: 53 [57], pl. 1, fig. 199.
Type(s): HOLOTYPE USNM_85644, Roanoke R., Weldon, N.C.

Unio (sec. Elliptio) insulsus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) insulsus — Frierson (1927), Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio percoarctatus Lea, 1857
Lea, 1857. Proc. Acad. Nat. Sci. 9: 85.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 8]: 59 [63], pl. 3, fig. 206.
Type(s): HOLOTYPE USNM_85529, Catawba R., Mecklenburg Co., N.C.

Unio (sec. Elliptio) complanatus var. jejunus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus-jejunus — Frierson (1927)
Elliptio (s.s.) violaceus jejunus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio savannahensis Lea, 1857
Lea, 1857. Proc. Acad. Nat. Sci. 9: 169.
Lea, 1858. Jour. Acad. Nat. Sci. 4 [O. 6]: 81, pl. 16, fig. 61.
Type(s): HOLOTYPE USNM_85404, Savannah R., Ga.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio spadiceus Lea, 1857
Lea, 1857. Proc. Acad. Nat. Sci. 9: 86.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 8]: 55 [59], pl. 1, fig. 201.
Type(s): HOLOTYPE USNM_85251, Deep R., N.C.

Unio (sec. Elliptio) spadiceus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) spadiceus — Frierson (1927), Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio subflavus Lea, 1857
Lea, 1857. Proc. Acad. Nat. Sci. 9: 170.
Lea, 1858. Jour. Acad. Nat. Sci. 4 [O. 6]: 90, pl. 19, fig. 70.
Type(s): HOLOTYPE USNM_85562, Walnut Creek, near Macon, Ga.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio vicinus Lea, 1857
Lea, 1857. Proc. Acad. Nat. Sci. 8: 262.
Lea, 1858. Jour. Acad. Nat. Sci. 4 [O. 6]: 61, pl. 9, fig. 43.
Type(s): HOLOTYPE USNM_85543, Swift Cr., bel. Macon, Ga.

Unio (sec. Elliptio) errans — Simpson (1900), Simpson (1914)
— de Gregorio (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio virens Lea, 1857
Lea, 1857. Proc. Acad. Nat. Sci. 9: 169.
Lea, 1858. Jour. Acad. Nat. Sci. 4 [O. 6]: 80, pl. 16, fig. 60.
Type(s): HOLOTYPE USNM_85544, Georgia.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio wheatleyi Lea, 1857
Lea, 1857. Proc. Acad. Nat. Sci. 9: 85.
(renamed Unio catawbensis Lea, 1857)

Unio (sec. Elliptio) catawbensis — Simpson (1900)
Unio (sec. Elliptio) rostrum — Simpson (1914)
Elliptio (s.s.) complanatus-catawbensis — Frierson (1927)
Elliptio (s.s.) violaceus wheatleyi — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)
Elliptio complanata — Bieler (2021)

Unio exactus Lea, 1858
Lea, 1858. Proc. Acad. Nat. Sci. 10: 41.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 8]: 62 [66], pl. 4, fig. 210.
Type(s): HOLOTYPE USNM_85002, Neuse R., near Raleigh, N.C.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio neusensis Lea, 1858
Lea, 1858. Proc. Acad. Nat. Sci. 10: 41.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 8]: 60 [64], pl. 4, fig. 208.
Type(s): HOLOTYPE USNM_85465, Neuse R., near Raleigh, N.C.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio postellii Lea, 1858
Lea, 1858. Proc. Acad. Nat. Sci. 10: 165.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 9]: 214 [32], pl. 26, fig. 94.
Type(s): HOLOTYPE USNM_85470, Carter’s Cr., Baldwin Co., Ga.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio strigosus — Clench & Turner (1956)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio purus Lea, 1858
Lea, 1858. Proc. Acad. Nat. Sci. 10: 41.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 8]: 61 [65], pl. 4, fig. 209.
Type(s): HOLOTYPE USNM_85003, Neuse R., near Raleigh, N.C.

Unio (sec. Elliptio) purus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio baldwinensis Lea, 1859
Lea, 1859. Proc. Acad. Nat. Sci. 11: 170.
Lea, 1860. Jour. Acad. Nat. Sci. 4 [O. 8]: 330 [12], pl. 51, fig. 155.
Type(s): HOLOTYPE USNM_85420, Carter’s Cr., Baldwin Co., N.C. [Georgia].

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio burkensis Lea, 1859
Lea, 1859. Proc. Acad. Nat. Sci. 11: 112.
Lea, 1859. Jour. Acad. Nat. Sci. 4 [O. 7]: 215 [33], pl. 27, fig. 95.
Type(s): HOLOTYPE USNM_85998, Buck Head Cr., Burke Co., Ga.

Unio (sec. Elliptio) burkensis — Simpson (1900), Simpson (1914)
Elliptio (s.s.) subniger — Frierson (1927), Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio raeensis Lea, 1859
Lea, 1859. Proc. Acad. Nat. Sci. 11: 171 [as ‘raeénsis’].
Lea, 1860. Jour. Acad. Nat. Sci. 4 [O. 8]: 331 [13], pl. 52, fig. 156 [as ‘raeénsis’].
Type(s): HOLOTYPE USNM_85571, Rae Cr., Georgia.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio decumbens Lea, 1861
Lea, 1861. Proc. Acad. Nat. Sci. 13: 40.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 8]: 87 [291], pl. 12, fig. 236.
Type(s): HOLOTYPE USNM_86150, Alabama.

Margaritana decumbens — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Margaritifera decumbens — Haas (1969), D.G. Smith (2001)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)
— Williams et al. (2008)

Unio northamptonensis Lea, 1861
Lea, 1861. Proc. Acad. Nat. Sci. 13: 392.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 9]: 190 [12], pl. 25, fig. 260.
Type(s): HOLOTYPE USNM_85527, Conn. R., Northampton, Mass.

Unio (sec. Elliptio) roanokensis var. northamptonensis — Simpson (1900), Simpson (1914)
Unio northamptonensis — de Gregorio (1914)
Elliptio (s.s.) complanatus-northamptonensis — Frierson (1927)
Elliptio (s.s.) violaceus northamptonensis — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio rostrum Lea, 1861
Lea, 1861. Proc. Acad. Nat. Sci. 13: 391.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 9]: 201 [23], pl. 29, fig. 270.
Type(s): HOLOTYPE USNM_85556, Davidson Co., N.C.

Unio (sec. Elliptio) catawbensis — Simpson (1900)
Unio (sec. Elliptio) rostrum — Simpson (1914)
Elliptio (s.s.) complanatus-catawbensis — Frierson (1927)
Elliptio (s.s.) violaceus wheatleyi — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio squameus Lea, 1861
Lea, 1861. Proc. Acad. Nat. Sci. 13: 391.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 9]: 200 [22], pl. 28, fig. 269.
Type(s): HOLOTYPE USNM_85530, N.C.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
— de Gregorio (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio aberrans Lea, 1863
Lea, 1863. Proc. Acad. Nat. Sci. 15: 191.
Lea, 1866. Jour. Acad. Nat. Sci. 6 [O. 11]: 7 [11], pl. 1, fig. 3.
Type(s): HOLOTYPE USNM_85600, Neuse R., 10 mi E of Raleigh, N. Carolina.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio chathamensis Lea, 1863
Lea, 1863. Proc. Acad. Nat. Sci. 15: 191.
Lea, 1866. Jour. Acad. Nat. Sci. 6 [O. 11]: 21 [25], pl. 6, fig. 19.
Type(s): HOLOTYPE USNM_85672, Rocky R., Chatham Co., N.C.

Unio (sec. Elliptio) tuomeyi — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio curatus Lea, 1863
Lea, 1863. Proc. Acad. Nat. Sci. 15: 193.
Lea, 1866. Jour. Acad. Nat. Sci. 6 [O. 11]: 23 [27], pl. 7, fig. 21.

Unio (sec. Elliptio) icterinus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus-icterinus — Frierson (1927)
Elliptio (s.s.) violaceus icterinus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio gastonensis Lea, 1863
Lea, 1863. Proc. Acad. Nat. Sci. 15: 191.
Lea, 1866. Jour. Acad. Nat. Sci. 6 [O. 11]: 20 [24], pl. 6, fig. 18.
Type(s): HOLOTYPE USNM_85409, Mine Cr., Gaston Co., N.C.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio indefinilus Lea, 1863
Lea, 1863. Proc. Acad. Nat. Sci. 15: 192.
Lea, 1866. Jour. Acad. Nat. Sci. 6 [O. 11]: 15 [19], pl. 4, fig. 12 [as ‘indefinitus’].
(renamed Unio indefinitus Haas, 1969)

Unio (sec. Elliptio) complanatus — Simpson (1914)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970)
Elliptio complanata — Bieler (2021)

Unio mecklenbergensis Lea, 1863
Lea, 1863. Proc. Acad. Nat. Sci. 15: 191.
Lea, 1866. Jour. Acad. Nat. Sci. 6 [O. 11]: 17 [21], pl. 5, fig. 15.
Type(s): HOLOTYPE USNM_85419, near Charlotte, Mecklenburg, Co., N.C.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio perlucens Lea, 1863
Lea, 1863. Proc. Acad. Nat. Sci. 15: 193.
Lea, 1866. Jour. Acad. Nat. Sci. 6 [O. 11]: 18 [22], pl. 5, fig. 16.
Type(s): HOLOTYPE USNM_85076, Six Runs, Sampson Co., N Carolina.

Unio (sec. Elliptio) micans — Simpson (1900), Simpson (1914)
Elliptio (s.s.) micans — Frierson (1927), Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio quadrilaterus Lea, 1863
Lea, 1863. Proc. Acad. Nat. Sci. 15: 192.
Lea, 1866. Jour. Acad. Nat. Sci. 6 [O. 11]: 5 [9], pl. 1, fig. 1.
Type(s): FIGURED SYNTYPE USNM_85385, Neuse R., near Raleigh, N.C.

Unio (sec. Elliptio) complanatus var. quadrilaterus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio raleighensis Lea, 1863
Lea, 1863. Proc. Acad. Nat. Sci. 15: 191.
Lea, 1866. Jour. Acad. Nat. Sci. 6 [O. 11]: 6 [10], pl. 1, fig. 2.
Type(s): HOLOTYPE USNM_85592, Neuse R., near Raleigh, N.C.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio weldonensis Lea, 1863
Lea, 1863. Proc. Acad. Nat. Sci. 15: 191.
Lea, 1866. Jour. Acad. Nat. Sci. 6 [O. 11]: 11 [15], pl. 3, fig. 8.
Type(s): HOLOTYPE USNM_85407, Roanoke R., Weldon, N.C.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio protensus Lea, 1865
Lea, 1865. Proc. Acad. Nat. Sci. 17: 88.
Lea, 1868. Jour. Acad. Nat. Sci. 6 [O. 12]: 256 [16], pl. 31, fig. 71.
Type(s): HOLOTYPE USNM_85994, River Eno, near Millsburg, Orange Co., N. Carolina.

Unio (sec. Elliptio) confertus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) geddingsianus — Frierson (1927), Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio beaverensis Lea, 1868
Lea, 1868. Proc. Acad. Nat. Sci. 20: 161.
Lea, 1868. Jour. Acad. Nat. Sci. 6 [O. 12]: 297 [57], pl. 44, fig. 109.
Type(s): HOLOTYPE USNM_85598, Beaver Cr., Cahawba R., N.C.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio datus Lea, 1868
Lea, 1868. Proc. Acad. Nat. Sci. 20: 161.
Lea, 1868. Jour. Acad. Nat. Sci. 6 [O. 12]: 299 [59], pl. 44, fig. 111.
Type(s): HOLOTYPE USNM_85097, Beaver Cr., Catawba R., N.C.

Unio (sec. Elliptio) icterinus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus-icterinus — Frierson (1927)
Elliptio (s.s.) violaceus icterinus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio humerosoides Lea, 1868
Lea, 1868. Proc. Acad. Nat. Sci. 20: 163.

Unio humerosus — Henderson (1935)

Unio humerosus Lea, 1868
Lea, 1868. Proc. Acad. Nat. Sci. 20: 161.
Lea, 1868. Jour. Acad. Nat. Sci. 6 [O. 12]: 301 [61], pl. 45, fig. 113.
Type(s): HOLOTYPE USNM_85414, Sugar Cr., near Charlotte, Mecklenburg, Co., N.C.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Unio humerosus — Henderson (1935)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio nubilus Lea, 1868
Lea, 1868. Proc. Acad. Nat. Sci. 20: 161.
Lea, 1868. Jour. Acad. Nat. Sci. 6 [O. 12]: 298 [58], pl. 44, fig. 110.
Type(s): HOLOTYPE USNM_85417, Paw Cr., near Charlotte, Mecklenburg, Co., N.C.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio tortuosus Sowerby, 1868
Sowerby, 1868. Conch. Icon. 16: pl. 65, sp. 330.
(homonym of Unio tortuosus Lea, 1865)
Type(s): HOLOTYPE (MONOTYPY) BMNH_74-12-11-25, Maryland.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio uhareensis Lea, 1868
Lea, 1868. Proc. Acad. Nat. Sci. 20: 145 [as ‘uharéensis’].
Lea, 1868. Jour. Acad. Nat. Sci. 6 [O. 12]: 304 [63], pl. 46, fig. 116 [as ‘uharéensis’].
Type(s): HOLOTYPE USNM_85576, Uharee R., Mongomery Co., N.C.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio santeensis Lea, 1871
Lea, 1871. Proc. Acad. Nat. Sci. 23: 193 [as ‘santeënsis’].
Lea, 1874. Jour. Acad. Nat. Sci. 8 [O. 13]: 20 [24], pl. 6, fig. 17.
Type(s): FIGURED SYNTYPE USNM_85635, Santee Canal, S.C.

Unio (sec. Elliptio) obnubilus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) raveneli — Frierson (1927), Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio amplus Lea, 1872
Lea, 1872. Proc. Acad. Nat. Sci. 24: 157.
Lea, 1874. Jour. Acad. Nat. Sci. 8 [O. 13]: 39 [43], pl. 13, fig. 36.
Type(s): FIGURED SYNTYPE USNM_85591, Irwins Cr., Mecklenberg Co., N.C.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio curvatus Lea, 1872
Lea, 1872. Proc. Acad. Nat. Sci. 24: 159.
Lea, 1874. Jour. Acad. Nat. Sci. 8 [O. 13]: 38 [42], pl. 13, fig. 35.
(homonym of Unio bonelli var. curvata Rossmässler, 1842)
Type(s): FIGURED SYNTYPE USNM_85550, Pfeiffer’s Pond, Mecklenburg Co., N. Carolina.

Unio (sec. Elliptio) complanatus — Simpson (1900)
Unio (sec. Elliptio) icterinus — Simpson (1914)
Elliptio (s.s.) complanatus-catawbensis — Frierson (1927)
Elliptio (s.s.) violaceus wheatleyi — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio differtus Lea, 1872
Lea, 1872. Proc. Acad. Nat. Sci. 24: 158.
Lea, 1874. Jour. Acad. Nat. Sci. 8 [O. 13]: 42 [46], pl. 14, fig. 39.
Type(s): FIGURED SYNTYPE USNM_85399, Savannah R., Ga.

Unio (sec. Elliptio) differtus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio dissimilis Lea, 1872
Lea, 1872. Proc. Acad. Nat. Sci. 24: 161.
Lea, 1874. Jour. Acad. Nat. Sci. 8 [O. 13]: 53 [57], pl. 18, fig. 52.
Type(s): FIGURED SYNTYPE USNM_86019, Long Creek, Gaston Co., N.C.

Unio (sec. Elliptio) burkensis — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio infuscus Lea, 1872
Lea, 1872. Proc. Acad. Nat. Sci. 24: 160.
Lea, 1874. Jour. Acad. Nat. Sci. 8 [O. 13]: 51 [55], pl. 17, fig. 49.
Type(s): FIGURED SYNTYPE USNM_85587, Fox R., N.C.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio irwinensis Lea, 1872
Lea, 1872. Proc. Acad. Nat. Sci. 24: 159.
Lea, 1874. Jour. Acad. Nat. Sci. 8 [O. 13]: 44 [48], pl. 15, fig. 42.
Type(s): FIGURED SYNTYPE USNM_85680, Irwins Cr., N.C.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio ligatus Lea, 1872
Lea, 1872. Proc. Acad. Nat. Sci. 24: 157.
Lea, 1874. Jour. Acad. Nat. Sci. 8 [O. 13]: 49 [53], pl. 17, fig. 47.
Type(s): FIGURED SYNTYPE USNM_85590, Irwins Cr., Mecklenberg Co., N.C.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio oblongus Lea, 1872
Lea, 1872. Proc. Acad. Nat. Sci. 24: 158.
Lea, 1874. Jour. Acad. Nat. Sci. 8 [O. 13]: 52 [56], pl. 18, fig. 50.
(homonym of Unio moquinianus var. oblongus Moquin-Tandon, 1855)
Type(s): FIGURED SYNTYPE USNM_85572, Irwins Cr., Mecklenberg Co., N.C.

Unio (sec. Elliptio) catawbensis — Simpson (1900)
Unio (sec. Elliptio) rostrum — Simpson (1914)
Elliptio (s.s.) complanatus-catawbensis — Frierson (1927)
Elliptio (s.s.) violaceus wheatleyi — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio ratus Lea, 1872
Lea, 1872. Proc. Acad. Nat. Sci. 24: 160.
Lea, 1874. Jour. Acad. Nat. Sci. 8 [O. 13]: 52 [56], pl. 18, fig. 51.
Type(s): HOLOTYPE (MONOTYPY) USNM_85382, Neuse R., N.C.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio subparallelus Lea, 1872
Lea, 1872. Proc. Acad. Nat. Sci. 24: 158.
Lea, 1874. Jour. Acad. Nat. Sci. 8 [O. 13]: 46 [50], pl. 16, fig. 44.
Type(s): FIGURED SYNTYPE USNM_85418, near Charlotte, Mecklenburg, Co., N.C.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio subsquamosus Lea, 1872
Lea, 1872. Proc. Acad. Nat. Sci. 24: 160.
Lea, 1874. Jour. Acad. Nat. Sci. 8 [O. 13]: 47 [51], pl. 16, fig. 45.
Type(s): FIGURED SYNTYPE USNM_85557, Yadkin R., N.C.

Unio (sec. Elliptio) complanatus — Simpson (1900)
Unio (sec. Elliptio) icterinus — Simpson (1914)
Elliptio (s.s.) complanatus-catawbensis — Frierson (1927)
Elliptio (s.s.) violaceus wheatleyi — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio yadkinensis Lea, 1872
Lea, 1872. Proc. Acad. Nat. Sci. 24: 156.
Lea, 1874. Jour. Acad. Nat. Sci. 8 [O. 13]: 32 [36], pl. 10, fig. 29.
Type(s): FIGURED SYNTYPE USNM_85387, Yadkin R., Salisbury, [Rowand Co.], N.C.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio cirratus Lea, 1874
Lea, 1874. Proc. Acad. Nat. Sci. 25: 422.
Lea, 1874. Jour. Acad. Nat. Sci. 8 [O. 13]: 55 [59], pl. 19, fig. 53.
Type(s): FIGURED SYNTYPE USNM_85584, Abbeville District, S. Carolina.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio infulgens Lea, 1874
Lea, 1874. Proc. Acad. Nat. Sci. 25: 422.
Lea, 1874. Jour. Acad. Nat. Sci. 8 [O. 13]: 60 [64], pl. 21, fig. 59.
Type(s): FIGURED SPECIMEN USNM_85403, Stewart’s Pond, Union Co., N.C.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
— Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio subolivaceus Lea, 1874
Lea, 1874. Proc. Acad. Nat. Sci. 25: 422.
Lea, 1874. Jour. Acad. Nat. Sci. 8 [O. 13]: 57 [61], pl. 20, fig. 56.
Type(s): FIGURED SYNTYPE USNM_85564, Fox R., N.C.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio (Arconaia) provancheriana Pilsbry, 1890
Pilsbry, 1890. Natural. Canadien 20: 171.
Pilsbry, 1892. Proc. Acad. Nat. Sci. 44: 132, pl. 7, figs. 4-6.
Type(s): UNKNOWN ANSP_42758, [no locality available - North America].

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio pullatus var. majusculus de Gregorio, 1914
de Gregorio, 1914. Il Nat. Siciliano 2: 57, pl. 8, figs. 3a-d.
(homonym of Unio (Elliptio) ravistellus var. majusculus Martens, 1900; intro'd as intra-sp. of Unio pullatus Lea, 1857)

Unio pullatus var. majusculus — de Gregorio (1914)
— Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio complanatus mainensis Rich, 1915
Rich, 1915. Science 42(1086): 580.

Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio indefinitus Haas, 1969
‘Lea’ of Authors.
Lea, 1866. Jour. Acad. Nat. Sci. 6 [O. 11]: 15 [19], pl. 4, fig. 12.
Haas, 1969. Das Tierreich 88: 235.
(new name for Unio indefinilus Lea, 1863)
Type(s): HOLOTYPE USNM_85388, Long Creek, Mecklenburg Co., N.C.

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)
Elliptio complanata — Bieler (2021)

Unio decumbans D.G. Smith, 2001
‘Lea’ D.G. Smith, 2001. [in] Bauer & Wächtler, Ecol. Evol. Unionoida 145: 43.
(error for Unio decumbens Lea, 1861)

Unio carenifera Ravenel, 1834
‘Lam’ Ravenel, 1834. Cat. Rec. Shells: 6.
(error for Unio carinifera Lamarck, 1819)

Unio perpureus Ravenel, 1834
‘Say’ Ravenel, 1834. Cat. Rec. Shells: 6.
(error for Unio purpureus Say, 1817)

Unio verginiana Ravenel, 1834
‘Lam.’ Ravenel, 1834. Cat. Rec. Shells: 6.
(error for Unio virginiana Lamarck, 1819)

Margarita (Unio) paliatus Lea, 1836
“Ravenel’s letter” Lea, 1836. Synopsis Fam. Naiades: 31. [nomen nudum]
Lea, 1838. Synopsis Fam. Naiades: 22. [nomen nudum]
Lea, 1852. Synopsis Fam. Naiades: 33. [nomen nudum]
‘Ravenel’s Letter’ Lea, 1870. Synopsis Fam. Naiades: 53. [nomen nudum]
Type(s): NOMEN NUDUM USNM_85658, Santee Canal, S.C.

Unio (sec. Elliptio) errans — Simpson (1900), Simpson (1914)

Unio (Cunicula) purpurata Swainson, 1840
‘Lam.’ Swainson, 1840. Treat. Malacol.: 267, 274.
(error for Unio purpurascens Lamarck, 1819)

Unio lugubris Küster, 1861
‘Lea’ Küster, 1861. Conchyl. Cab. 9(2): 234, pl. 79, fig. 1.
(misidentified reference to Unio lugubris Lea, 1838)

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)
Elliptio (s.s.) complanatus — Frierson (1927)
Elliptio (s.s.) violaceus violaceus — Haas (1969)

Unio jejunus Sowerby, 1868
‘Lea’ Sowerby, 1868. Conch. Icon. 16: pl. 68, sp. 347; errata [changed to ‘depressus of D’Orbigny’].
(reference to Unio jejunus Lea, 1838)

Unio (sec. Elliptio) complanatus var. jejunus — Simpson (1900)

Unio neglectus Sowerby, 1868
‘Lea’ Sowerby, 1868. Conch. Icon. 16: pl. 65, sp. 329.
(misidentified reference to Unio neglectus Lea, 1843)

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)

Unio palliatus Ravenel, 1875
‘Lea’ Ravenel, 1875. Cat. Rec. Shells: 57.
(error for Margarita (Unio) paliatus Lea, 1836)

Unio (sec. Elliptio) errans — Simpson (1900)
Elliptio (s.s.) errans — Frierson (1927)
Elliptio (s.s.) complanata — R.I. Johnson (1970), Burch (1975)

Unio abevillensis Paetel, 1890
‘Lea’ Paetel, 1890. Cat. Conch.-Samml. 3: 143.
(error for Unio abbevillensis Lea, 1857)

Unio blauverenses Paetel, 1890
‘Lea’ Paetel, 1890. Cat. Conch.-Samml. 3: 146.
(error for Unio beaverensis Lea, 1868)

Unio (sec. Elliptio) complanatus — Simpson (1900), Simpson (1914)

Unio zatus Paetel, 1890
‘Lea’ Paetel, 1890. Cat. Conch.-Samml. 3: 172.
(error for Unio datus Lea, 1868)

Unio (sec. Elliptio) icterinus — Simpson (1900), Simpson (1914)

Unio bleaverensis Simpson, 1900
‘Pætel’ Simpson, 1900. Proc. U.S. Nat. Mus. 22: 724.
(error for Unio blauverenses Paetel, 1890)