Unio mitchelli Dall, 1895
Simpson in Dall, 1895. Proc. U.S. Nat. Mus. 18: 5.
Simpson, 1896. Proc. U.S. Nat. Mus. 18: 371, pl. 32, figs. 1-3.
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 711.
Simpson, 1914. Descr. Cat. Naiades: 622.
Type(s): LECTOTYPE [AS HOLOTYPE] USNM_128364 (by R.I. Johnson, 1975: 15), Guadalupe R., Victoria Co., Texas.

Unio (sec. Elliptio) mitchelli — Simpson (1900), Simpson (1914)
— Martens (1900)
Elliptio (Barynaias) tamaulipasensis — Frierson (1927)
Nephronaias (Sphenonaias) taumilapana — Haas (1969)
Quincuncina mitchelli — Turgeon et al. (1988), Williams et al. (1993), Howells et al. (1996), Turgeon et al. (1998), R.I. Johnson (1999), Graf & Cummings (2007), Cummings & Graf (2010), ITIS (2012)
Quadrula mitchelli — Bogan (2010), Haag (2012)
Fusconaia mitchelli — IUCN (2014), Pfeiffer et al. (2016), Williams et al. (2017), Inoue et al. (2018), Pieri et al. (2018), ... Czaja et al. (2023), Hopper et al. (2023), FMCS (2025), Cummings et al. (2025), Campbell & Lydeard (2026)

Unio (sec. Elliptio) mitchelli var. elongatus Simpson, 1914
Simpson, 1914. Descr. Cat. Naiades: 623.
(homonym of Unio elongata Lamarck, 1819; intro'd as intra-sp. of Unio mitchelli Dall, 1895)
Type(s): LECTOTYPE USNM_251917 (by R.I. Johnson, 1975: 12), Guadalupe River, near Kerrville, Texas.

Unio (sec. Elliptio) mitchelli var. elongatus — Simpson (1914)
Elliptio (Barynaias) tamaulipasensis-elongatus — Frierson (1927)
Nephronaias (Sphenonaias) taumilapana — Haas (1969)
Quincuncina mitchelli — Howells et al. (1996), R.I. Johnson (1999)
Fusconaia mitchelli — Smith et al. (2020), Cummings et al. (2025)

Quincuncina guadalupensis Wurtz, 1950
Wurtz, 1950. Notulae Naturae (224): 2, figs. 1-5.
Type(s): HOLOTYPE (MONOTYPY) ANSP_185974, Guadalupe R., Seguin, Guadalupe Co., Texas.

Quincuncina guadalupensis — Burch (1975)
Quincuncina mitchelli — Howells et al. (1996), R.I. Johnson (1999)
Fusconaia mitchelli — Smith et al. (2020), Cummings et al. (2025)