Unio caroliniana Bosc, 1801
Bosc, 1801. Hist. Nat. Coquilles 3: 142.
Bosc, 1824. Hist. Nat. Coquilles 3: 139, pl. 23, fig. 2.

Unio (sec. Uniomerus) obesus — Simpson (1900), Simpson (1914)
Elliptio (Uniomerus) obesus — Frierson (1927)
Uniomerus obesus — Haas (1969)
— R.I. Johnson (1970)
Uniomerus carolinianus — Davis (1983), Davis (1984), Turgeon et al. (1998), Brim Box & Williams (2000), Bogan (2002), ... FMCS (2021), Neemuchwala et al. (2023), Hopper et al. (2023), FMCS (2025), Campbell & Lydeard (2026)
Uniomerus caroliniana — Turgeon et al. (1988), Williams et al. (1993), Lydeard et al. (1999), Kandl et al. (2001), Jones et al. (2005), Graf & Cummings (2007), Cummings & Graf (2010), IUCN (2012)
Uniomerus carolinensis [sic] — Campbell & Lydeard (2012)

Unio obesus Lea, 1831
Lea, 1831. Trans. Amer. Phil. Soc. 4 [O. 1]: 96, pl. 13, fig. 26.
Type(s): HOLOTYPE USNM_85366, Little Ogeechee, Georgia.

Unio (sec. Uniomerus) obesus — Simpson (1900), Simpson (1914)
Unio obesus, var. — de Gregorio (1914)
Elliptio (Uniomerus) obesus — Frierson (1927)
Uniomerus obesus — Clench & Turner (1956), Haas (1969), Turgeon et al. (1988), Williams et al. (1993), Lydeard et al. (1996), Huang et al. (2002), Krebs et al. (2003), ITIS (2012)
Uniomerus tetralasmus — R.I. Johnson (1970), R.I. Johnson (1972), Burch (1975)
Uniomerus carolinianus — Turgeon et al. (1998)
Uniomerus caroliniana — IUCN (2012)

Unio blandingianus Lea, 1834
Lea, 1834. Trans. Amer. Phil. Soc. 5 [O. 1]: 101, pl. 15, fig. 44.
Type(s): HOLOTYPE USNM_85715, St. Johns R., Fla.

Unio (sec. Uniomerus) obesus var. blandingianus — Simpson (1900), Simpson (1914)
Elliptio (Uniomerus) obesus-blandingianus — Frierson (1927)
Uniomerus obesus — Clench & Turner (1956), Haas (1969)
Uniomerus tetralasmus — R.I. Johnson (1970), R.I. Johnson (1972), Burch (1975)
Uniomerus carolinianus — Williams et al. (2011), Williams et al. (2014)

Unio paludicolus Gould, 1845
Gould, 1845. Proc. Boston Soc. Nat. Hist. 2: 53.
Type(s): LECTOTYPE MCZ_169278, Everglades of Florida.

Unio (sec. Uniomerus) obesus var. paludicolus — Simpson (1900), Simpson (1914)
Elliptio (Uniomerus) obesus-paludicolus — Frierson (1927)
Uniomerus obesus — Clench & Turner (1956), Haas (1969)
Uniomerus tetralasmus — R.I. Johnson (1970), R.I. Johnson (1972), Burch (1975)
Uniomerus carolinianus — Williams et al. (2011), Williams et al. (2014)

Unio hebes Lea, 1852
Lea, 1852. Trans. Amer. Phil. Soc. 10 [O. 5]: 267 [23], pl. 18, fig. 21.
Lea, 1852. Proc. Amer. Phil. Soc. 5: 251. [nomen nudum]
Type(s): HOLOTYPE USNM_85383, Oconee R., near Athens, Georgia.

Unio (sec. Uniomerus) obesus — Simpson (1900), Simpson (1914)
Elliptio (Uniomerus) obesus — Frierson (1927)
Uniomerus obesus — Clench & Turner (1956), Haas (1969)
Uniomerus tetralasmus — R.I. Johnson (1970), R.I. Johnson (1972), Burch (1975)

Unio ineptus Lea, 1852
Lea, 1852. Trans. Amer. Phil. Soc. 10 [O. 5]: 261 [17], pl. 15, fig. 12.
Lea, 1852. Proc. Amer. Phil. Soc. 5: 251 [as ‘irreptus’]. [nomen nudum]
Type(s): HOLOTYPE USNM_85326, Abbeville District, SC.

Unio (sec. Uniomerus) obesus — Simpson (1900), Simpson (1914)
Elliptio (Uniomerus) obesus — Frierson (1927)
Uniomerus obesus — Clench & Turner (1956), Haas (1969)
Uniomerus tetralasmus — R.I. Johnson (1970), R.I. Johnson (1972), Burch (1975)

Unio carolinensis Mørch, 1853
‘Bosc’ of Authors.
Mørch, 1853. Cat. Conch. Yoldi 2: 46.
Campbell & Lydeard, 2012. Amer. Malac. Bull. 30(1): 33.
(error for Unio caroliniana Bosc, 1801)

Unio cicur Lea, 1861
Lea, 1861. Proc. Acad. Nat. Sci. 13: 39.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 8]: 93 [97], pl. 13, fig. 241.
Type(s): HOLOTYPE USNM_85532, Little Ocmulgee R., Georgia.

Unio (sec. Uniomerus) obesus — Simpson (1900), Simpson (1914)
Elliptio (Uniomerus) obesus — Frierson (1927)
Uniomerus obesus — Clench & Turner (1956), Haas (1969)
Uniomerus tetralasmus — R.I. Johnson (1970), R.I. Johnson (1972), Burch (1975)

Unio squalidus Lea, 1863
Lea, 1863. Proc. Acad. Nat. Sci. 15: 192.
Lea, 1866. Jour. Acad. Nat. Sci. 6 [O. 11]: 22 [26], pl. 7, fig. 20.
Type(s): HOLOTYPE USNM_85376, Roanoke R., Weldon, N.C.

Unio (sec. Elliptio) complanatus var. quadrilaterus — Simpson (1900), Simpson (1914)
Unio (sec. Uniomerus) obesus — Simpson (1900), Simpson (1914)
Elliptio (Uniomerus) obesus — Frierson (1927)
Uniomerus obesus — Clench & Turner (1956), Haas (1969)
Uniomerus tetralasmus — R.I. Johnson (1970), R.I. Johnson (1972), Burch (1975)

Unio bisselianus Lea, 1867
Lea, 1867. Proc. Acad. Nat. Sci. 19: 81.
Lea, 1868. Jour. Acad. Nat. Sci. 6 [O. 12]: 277 [37], pl. 37, fig. 90.
Type(s): HOLOTYPE USNM_85373, Bissels Pond, Charlotte, N.C.

Unio (sec. Uniomerus) bissellianus [sic] — Simpson (1900), Simpson (1914)
Elliptio (Uniomerus) bissellianus [sic] — Frierson (1927)
Uniomerus obesus — Clench & Turner (1956)
Uniomerus bissellianus [sic] — Haas (1969)
Uniomerus tetralasmus — R.I. Johnson (1970), R.I. Johnson (1972), Burch (1975)

Unio jewettii Lea, 1867
Lea, 1867. Proc. Acad. Nat. Sci. 19: 81.
Lea, 1868. Jour. Acad. Nat. Sci. 6 [O. 12]: 276 [36], pl. 37, fig. 89.
Type(s): HOLOTYPE USNM_85374, Sink of Noonan’s Lake, Fla.

Unio (sec. Uniomerus) obesus — Simpson (1900), Simpson (1914)
Elliptio (Uniomerus) obesus — Frierson (1927)
Uniomerus obesus — Clench & Turner (1956), Haas (1969)
Uniomerus tetralasmus — R.I. Johnson (1970), R.I. Johnson (1972), Burch (1975)
Uniomerus carolinianus — Williams et al. (2011), Williams et al. (2014)

Unio pawensis Lea, 1868
Lea, 1868. Proc. Acad. Nat. Sci. 20: 161.
Lea, 1868. Jour. Acad. Nat. Sci. 6 [O. 12]: 302 [62], pl. 45, fig. 114.
Type(s): HOLOTYPE USNM_85380, Catawba R., N.C.

Unio (sec. Uniomerus) obesus — Simpson (1900), Simpson (1914)
Elliptio (Uniomerus) obesus — Frierson (1927)
Uniomerus obesus — Clench & Turner (1956), Haas (1969)
Uniomerus tetralasmus — R.I. Johnson (1970), R.I. Johnson (1972), Burch (1975)

Unio rivicolus Conrad, 1868
Conrad, 1868. Amer. J. Conch. 4: 280, pl. 18, fig. 4.
Type(s): HOLOTYPE ANSP_41411, Tampa, Fla.

Unio (sec. Uniomerus) obesus — Simpson (1900)
Unio (sec. Uniomerus) obesus var. blandingianus — Simpson (1914)
Elliptio (Uniomerus) obesus — Frierson (1927)
Uniomerus obesus — Clench & Turner (1956), Haas (1969)
Uniomerus tetralasmus — R.I. Johnson (1970), R.I. Johnson (1972), Burch (1975)
Uniomerus carolinianus — Williams et al. (2011), Williams et al. (2014)

Unio bissellianus Lea, 1870
‘Lea’ of Authors.
Lea, 1870. Synopsis Fam. Naiades: 50.
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 743.
Simpson, 1914. Descr. Cat. Naiades: 714.
Frierson, 1927. Check List N. Amer. Naiades: 35.
Haas, 1969. Das Tierreich 88: 210.
(error for Unio bisselianus Lea, 1867)

Unio irreptus Lea, 1852
Lea, 1852. Proc. Amer. Phil. Soc. 5: 251. [nomen nudum]
(error for Unio ineptus Lea, 1852)

Unio carolinanus Conrad, 1853
‘Bosc’ Conrad, 1853. Proc. Acad. Nat. Sci. 6: 246.
(error for Unio caroliniana Bosc, 1801)

Unio paludicolor Conrad, 1853
‘Gould’ Conrad, 1853. Proc. Acad. Nat. Sci. 6: 254.
(error for Unio paludicolus Gould, 1845)

Unio (sec. Uniomerus) obesus var. paludicolus — Simpson (1900), Simpson (1914)
Elliptio (Uniomerus) obesus-blandingianus — Frierson (1927)
Uniomerus tetralasmus — R.I. Johnson (1970), R.I. Johnson (1972), Burch (1975)