Unio lanceolatus Lea, 1828
Lea, 1828. Trans. Amer. Phil. Soc. 3 [O. 1]: 266 [8], pl. 3, fig. 2.
Type(s): HOLOTYPE USNM_85905, Tar R., at Tarborough, N. Carolina.

Unio (sec. Elliptio) lanceolatus — Simpson (1900), Simpson (1914)
Elliptio lanceolatus — Ortmann (1914)
Unio lanceolatus — de Gregorio (1914)
Elliptio (s.s.) lanceolatus — Frierson (1927), Haas (1969)
Elliptio (s.s.) lanceolata — R.I. Johnson (1970), Burch (1975)
Elliptio lanceolata — Davis & Fuller (1981), Davis et al. (1981), Kat (1983), Davis (1984), Turgeon et al. (1988), ... Graf & Cummings (2021), FMCS (2021), Hopper et al. (2023), MolluscaBase (2024), FMCS (2025)
Parvaspina lanceolata — Campbell & Lydeard (2026)

Unio duttonianus Lea, 1841
Lea, 1841. Proc. Amer. Phil. Soc. 2: 31.
Lea, 1842. Trans. Amer. Phil. Soc. 8 [O. 3]: 236 [74], pl. 22, fig. 50.

Unio (sec. Elliptio) duttonianus — Simpson (1900), Simpson (1914)
Unio shepardianus f.a duttonianus — de Gregorio (1914)
Elliptio (s.s.) duttonianus — Frierson (1927), Haas (1969)
Elliptio (s.s.) lanceolata — R.I. Johnson (1970), Burch (1975)

Unio sagittiformis Lea, 1852
Lea, 1852. Trans. Amer. Phil. Soc. 10 [O. 5]: 277 [33], pl. 22, fig. 35.
Lea, 1852. Proc. Amer. Phil. Soc. 5: 252 [as ‘sagittaformis’]. [nomen nudum]
Type(s): HOLOTYPE USNM_85970, Oconee R., near Athens, Ga.

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

Unio emmonsii Lea, 1857
Lea, 1857. Proc. Acad. Nat. Sci. 9: 86.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 8]: 56 [60], pl. 2, fig. 203.
Type(s): HOLOTYPE USNM_86028, Roanoke R., Weldon, N.C.

Unio (sec. Elliptio) emmonsii — Simpson (1900), Simpson (1914)
Unio emmonsii, aff. — de Gregorio (1914)
Elliptio (s.s.) emmonsii — Frierson (1927), Haas (1969)
Elliptio (s.s.) lanceolata — R.I. Johnson (1970), Burch (1975)
Elliptio emmonsii — Bogan (2002)

Unio naviculoides Lea, 1857
Lea, 1857. Proc. Acad. Nat. Sci. 9: 170.
Lea, 1858. Jour. Acad. Nat. Sci. 4 [O. 6]: 94, pl. 20, fig. 74.
Type(s): HOLOTYPE USNM_86005, Buck Head Cr., Burke Co., Ga.

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

Unio rostraeformis Lea, 1857
Lea, 1857. Proc. Acad. Nat. Sci. 8: 262 [as ‘rostræformis’].
Lea, 1858. Jour. Acad. Nat. Sci. 4 [O. 6]: 64, pl. 10, fig. 46 [as ‘rostriformis’].
Type(s): HOLOTYPE USNM_85973, Swift Creek, near Macon, Georgia.

Unio (sec. Elliptio) rostraeformis — Simpson (1900), Simpson (1914)
— de Gregorio (1914)
Elliptio (s.s.) rostraeformis — Frierson (1927), Haas (1969)
Elliptio (s.s.) lanceolata — R.I. Johnson (1970), Burch (1975)
Elliptio producta — Bieler (2021)

Unio rostriformis Lea, 1857
Lea, 1857. Proc. Acad. Nat. Sci. 8: 262 [as ‘rostræformis’].
Lea, 1858. Jour. Acad. Nat. Sci. 4 [O. 6]: 64, pl. 10, fig. 46.
Lea, 1870. Synopsis Fam. Naiades: 60.
(error for Unio rostraeformis Lea, 1857)

Unio (sec. Elliptio) rostraeformis — Simpson (1900), Simpson (1914)
Elliptio (s.s.) lanceolata — R.I. Johnson (1970), Burch (1975)
Elliptio producta — Bieler (2021)

Unio hazlehurstianus Lea, 1858
Lea, 1858. Proc. Acad. Nat. Sci. 10: 166.
Lea, 1859. Jour. Acad. Nat. Sci. 4 [O. 7]: 211 [29], pl. 26, fig. 92 .
Type(s): HOLOTYPE USNM_86009, Satilla R., Camden Co., Ga.

Unio (sec. Elliptio) hazelhurstianus [sic] — Simpson (1900), Simpson (1914)
Elliptio (s.s.) hazelhurstianus [sic] — Frierson (1927), Haas (1969)
Elliptio (s.s.) lanceolata — R.I. Johnson (1970), Burch (1975)

Unio viridulus Lea, 1863
Lea, 1863. Proc. Acad. Nat. Sci. 15: 193.
Lea, 1866. Jour. Acad. Nat. Sci. 6 [O. 11]: 10 [14], pl. 3, fig. 7.
(homonym of Unio favidens var. viridula Benson, 1862)
Type(s): HOLOTYPE (MONOTYPY) USNM_85908, Neuse R., near Raleigh, N.C.

Unio (sec. Elliptio) viridulus — Simpson (1900), Simpson (1914)
Unio viridulus — de Gregorio (1914)
Elliptio (s.s.) viridulus — Frierson (1927), Haas (1969)
Elliptio (s.s.) lanceolata — R.I. Johnson (1970), Burch (1975)
Elliptio viridula — Bogan (2002)

Margaron (Unio) sagittaeformis Lea, 1870
‘Lea’ of Authors.
Lea, 1870. Synopsis Fam. Naiades: 60.
B.H. Wright, 1888. Check List N. Amer. Unionidae etc.: [5].
(error for Unio sagittiformis Lea, 1852)

Unio hazelhurstianus B.H. Wright, 1888
‘Lea’ of Authors.
B.H. Wright, 1888. Check List N. Amer. Unionidae etc.: [3].
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 719 [as ‘Unio (sec. Elliptio) hazelhurstianus’].
Simpson, 1914. Descr. Cat. Naiades: 648.
Frierson, 1927. Check List N. Amer. Naiades: 29 [as ‘Elliptio (Elliptio) hazelhurstianus’].
Haas, 1969. Das Tierreich 88: 229 [as ‘Elliptio (Elliptio) hazelhurstianus’].
R.I. Johnson, 1970. Bull. MCZ 140(6): 333.
Burch, 1975. Freshw. Unio. North Amer.: 164.
(error for Unio hazlehurstianus Lea, 1858)

Unio arctior var. fisheropsis de Gregorio, 1914
de Gregorio, 1914. Il Nat. Siciliano 2: 45, pl. 5, figs. 3a-c.
(intro'd as intra-sp. of Unio arctior Lea, 1838)

Unio arctior var. fisheropsis — de Gregorio (1914)
Elliptio (s.s.) lanceolata — R.I. Johnson (1970), Burch (1975)

Unio sagittaformis Lea, 1852
Lea, 1852. Proc. Amer. Phil. Soc. 5: 252. [nomen nudum]
(error for Unio sagittiformis Lea, 1852)

Unio haslehurstianus Sowerby, 1866
Sowerby, 1866. Conch. Icon. 16: pl. 35, sp. 188.
(error for Unio hazlehurstianus Lea, 1858)

Unio (sec. Elliptio) hazelhurstianus [sic] — Simpson (1900)

Unio rostreformis de Gregorio, 1914
‘Lea’ de Gregorio, 1914. Il Nat. Siciliano 2: 46.
(error for Unio rostraeformis Lea, 1857)