Unio rotundata Lamarck, 1819
Lamarck, 1819. Hist. Natur. Anim. sans Vert. 6: 75, sp. 24.
Type(s): UNKNOWN USNM_85760, Louisiana.

Glebula rotundata — Simpson (1900), Simpson (1914), Thiele (1934), Clench & Turner (1956), Haas (1969), ... Inoue et al. (2020), Graf & Cummings (2021), FMCS (2021), Hopper et al. (2023), Freeman et al. (2025)
Glebula suborbiculata — Frierson (1927)
G. rotundata — Marshall et al. (2018)

Unio suborbiculata Lamarck, 1819
Lamarck, 1819. Hist. Natur. Anim. sans Vert. 6: 81, sp. 48.
Type(s): UNKNOWN MNHN_MPL_0034, “Habite... les eaux douces des climats chauds? Cabinet de MM. Daudebard et Faujas.” Lives in fresh water in hot climates? Office of Messrs. Daudebard and Faujas." .

Glebula rotundata — Simpson (1900), Simpson (1914), Clench & Turner (1956), Haas (1969), R.I. Johnson (1969), Burch (1975), R.I. Johnson (1980), Vidrine (1993), Howells et al. (1996), Brim Box & Williams (2000), Williams et al. (2008), Watters et al. (2009)
Glebula suborbiculata — Frierson (1927)

Obliquaria (Plagiola) decorticata Rafinesque, 1820
Rafinesque, 1820. Ann. Gén. Sci. Phys. 5 (13): 302 [also as ‘U. decorticata’].
Rafinesque, 1864. [in] Binney & Tryon, reprint: 46.

— Vanatta (1915)
Glebula suborbiculata — Frierson (1927)

Unio glebulus Say, 1831
Say, 1831. Transylvania J. Med. Assoc. Sci. 4: 526.
Say, 1832. Amer. Conch. 4: 34.

Glebula rotundata — Simpson (1900), Simpson (1914), Clench & Turner (1956), Haas (1969), Burch (1975), Howells et al. (1996), Brim Box & Williams (2000), Williams et al. (2008), Watters et al. (2009)
Glebula suborbiculata — Frierson (1927)

Unio subglobosus Lea, 1834
Lea, 1834. Trans. Amer. Phil. Soc. 5 [O. 1]: 30, pl. 2, fig. 3.

Glebula rotundata — Simpson (1900), Simpson (1914), Clench & Turner (1956), Haas (1969), Burch (1975), Howells et al. (1996), Brim Box & Williams (2000), Williams et al. (2008), Watters et al. (2009)
Glebula suborbiculata — Frierson (1927)

Unio globulus Ferussac, 1835
‘Say’ of Authors.
Ferussac, 1835. Mag. Zool. 5: 26.
Reeve, 1865. Conch. Icon. 16: pl. 23, sp. 106.
(error for Unio glebulus Say, 1831)

Unio grandensis Conrad, 1855
Conrad, 1855. Proc. Acad. Nat. Sci. 7: 256.

Glebula rotundata — Simpson (1900), Simpson (1914), Clench & Turner (1956), Haas (1969), Burch (1975), Brim Box & Williams (2000), Watters et al. (2009)
Glebula suborbiculata — Frierson (1927)
Cyrtonaias tampicoensis — R.I. Johnson (1999)

Unio granadensis Simpson, 1900
‘Conrad’ of Authors.
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 598.
Simpson, 1914. Descr. Cat. Naiades: 289 [corrected in corrigenda].
Morrison, 1943. Nautilus 57: 15.
(error for Unio grandensis Conrad, 1855)

Glebula rotundata — Clench & Turner (1956), Haas (1969), Burch (1975)

Quadrula (Quincuncina) vittata Frierson, 1927
‘Lamarck’ Reeve, 1865. Conch. Icon. 16: pl. 23, sp. 106 [as ‘Unio rotundatus’].
Frierson, 1927. Check List N. Amer. Naiades: 50, sp. 218.

Quadrula (Quincuncina) vittata — Frierson (1927)
Quincuncina vittata — Haas (1969)

Unio rotundatus Reeve, 1865
‘Lamarck’ Reeve, 1865. Conch. Icon. 16: pl. 23, sp. 106.
(reference to Unio rotundata Lamarck, 1819)

Glebula rotundata — Simpson (1900), Simpson (1914)
Quadrula (Quincuncina) vittata — Frierson (1927)