Unio cerinus Conrad, 1838
Conrad, 1838. Monogr. Fam. Unionidae 2(11): 95, pl. 52.
Conrad, 1853. Proc. Acad. Nat. Sci. 6: 246.
Type(s): LECTOTYPE ANSP_41644, New Orleans, La.

Quadrula (sec. Fusconaia) cerina — Simpson (1900), Simpson (1914)
Fusconaia cerina — Ortmann (1912), Turgeon et al. (1988), Williams et al. (1993), Vidrine (1993), Rosenberg et al. (1994), ... Johnson et al. (2023), Hopper et al. (2023), Hauck et al. (2023), FMCS (2025), Campbell & Lydeard (2026)
Quadrula (Fusconia [sic]) flava — Frierson (1927)
Fusconaia flava flava — Haas (1969)
Fusconaia flava — R.I. Johnson (1980), Howells et al. (1996)

Unio glandaceus Lea, 1861
Lea, 1861. Proc. Acad. Nat. Sci. 13: 59.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 8]: 77 [81], pl. 9, fig. 226.
Type(s): HOLOTYPE USNM_84577, Cahawba R., Ala.

Quadrula (sec. Fusconaia) glandacea — Simpson (1900), Simpson (1914)
Quadrula (Fusconia [sic]) glandacea — Frierson (1927)
Fusconaia glandacea — Haas (1969)
Fusconaia cerina — Williams et al. (2008)

Unio negatus Lea, 1861
Lea, 1861. Proc. Acad. Nat. Sci. 13: 59.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 8]: 76 [80], pl. 9, fig. 225.
Type(s): HOLOTYPE USNM_84382, Big Prairie Cr., Ala.

Quadrula (sec. Fusconaia) rubida — Simpson (1900), Simpson (1914)
Quadrula (Fusconia [sic]) flava-negata — Frierson (1927)
Fusconaia flava negata — Haas (1969)
Fusconaia cerina — Williams et al. (2008)

Unio rubidus Lea, 1861
Lea, 1861. Proc. Acad. Nat. Sci. 13: 40.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 8]: 95 [99], pl. 14, fig. 244.
Type(s): HOLOTYPE USNM_84381, Columbus, Tombigbee R., Miss.

Quadrula (sec. Fusconaia) rubida — Simpson (1900), Simpson (1914)
Quadrula (Fusconia [sic]) hebetata — Frierson (1927)
Fusconaia hebetata — Haas (1969)
Fusconaia flava — Burch (1975), R.I. Johnson (1980)
Fusconaia cerina — Williams et al. (2008)

Quadrula rubidula Frierson, 1905
Frierson, 1905. Nautilus 19(2): 14, pl. 1, figs. 3-4.
Type(s): HOLOTYPE UMMZ_113535, North River, Tyner, Tuscaloosa Co., Alabama.

Quadrula (sec. Fusconaia) rubidula — Simpson (1914)
Quadrula (Fusconia [sic]) rubidula — Frierson (1927)
Fusconaia rubidula — Haas (1969), Graf & Cummings (2007), Cummings & Graf (2010)
Fusconaia cerina — Williams et al. (2008), Graf & Cummings (2021)

Quadrula (sec. Fusconaia) castanea Simpson, 1914
Simpson, 1914. Descr. Cat. Naiades: 877.
Type(s): LECTOTYPE USNM_159959, Tombigbee R., Moscow, Ala.

Quadrula (sec. Fusconaia) castanea — Simpson (1914)
Quadrula (Fusconia [sic]) flava-nasuta — Frierson (1927)
— Haas (1969)
Fusconaia cerina — Williams et al. (2008)