Unio riddellii Lea, 1861
Lea, 1861. Proc. Acad. Nat. Sci. 13: 392.
Lea, 1862. Jour. Acad. Nat. Sci. 5 [O. 9]: 198 [20], pl. 27, fig. 267.
Type(s): HOLOTYPE USNM_84635, Dallas, Texas.

Quadrula (sec. Fusconaia) riddellii — Simpson (1900), Simpson (1914)
Pleurobema riddelli — Ortmann (1912), Turgeon et al. (1988), Williams et al. (1993), Vidrine (1993), Haag (2012)
Quadrula (Obliquata) ridellii [sic] — Frierson (1927), Haas (1969)
Pleurobema riddellii — Howells et al. (1996), IUCN (1996), Turgeon et al. (1998), Graf & Cummings (2007), Bogan (2010), ... Lopes-Lima et al. (2019), Graf & Cummings (2021), FMCS (2021), Johnson et al. (2023), Hopper et al. (2023)
Pleurobema (Sintoxia) riddellii — Campbell & Lydeard (2012), Burlakova et al. (2012)
Pleurobema ridelli [sic] — Pfeiffer et al. (2016)

Unio friersoni B.H. Wright, 1896
B.H. Wright, 1896. Nautilus 9(12): 134, pl. 33.
Type(s): LECTOTYPE USNM_133432 (by R.I. Johnson, 1967: 6), Little Red River, arm of Bayou Pierre, DeSoto Parrish, La.

Quadrula (sec. Fusconaia) friersoni — Simpson (1900), Simpson (1914)
Pleurobema friersoni — Ortmann (1914)
Quadrula (Obliquata) friersoni — Frierson (1927), Haas (1969)
Fusconaia undata — R.I. Johnson (1980)
Pleurobema riddelli — Vidrine (1993)
Pleurobema riddellii — Howells et al. (1996)
Pleurobema (Sintoxia) riddellii — Burlakova et al. (2012)

Unio ridellii Frierson, 1927
‘Lea’ of Authors.
Frierson, 1927. Check List N. Amer. Naiades: 54.
Haas, 1969. Das Tierreich 88: 300.
Pfeiffer et al., 2016. Conserv. Genet. 17(2): [3].
(error for Unio riddellii Lea, 1861)