Unio ozarkensis Call, 1887
Call, 1887. Proc. U.S. Nat. Mus. 10: 498, pl. 27.
Call, 1895. Trans. Acad. Sci. St. Louis 7: 33, pl. 18.
Type(s): LECTOTYPE MCZ_5707 (by R.I. Johnson, 1975: 143), Jacks Fork, Current River, Shannon Co., Mo.

Lampsilis (sec. Eurynia) ozarkensis — Simpson (1900)
Lampsilis (Eurynia) ozarkensis — Simpson (1914)
Nephronaias ozarkensis — Utterback (1916)
Fusconaia ozarkensis — Ortmann (1923), Ortmann (1925), Haas (1969), Burch (1975), Gordon et al. (1979), ... Graf & Cummings (2021), FMCS (2021), Hopper et al. (2023), FMCS (2025), Campbell & Lydeard (2026)
Quadrula (Fusconia [sic]) ozarkensis — Frierson (1927)

Pleurobema argentea pannosa Simpson, 1900
Simpson, 1900. Proc. Acad. Nat. Sci. 52: 82.
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 763.
Simpson, 1914. Descr. Cat. Naiades: 799.
(intro'd as intra-sp. of Unio argenteus Lea, 1841)

Pleurobema (s.s.) argentea var. pannosa — Simpson (1900)
Pleurobema argenteus pannosa — Simpson (1900)
Pleurobema (s.s.) argenteum var. pannosum — Simpson (1914)
Quadrula (Fusconia [sic]) pannosa — Frierson (1927)
Fusconaia pannosa — Haas (1969)
Fusconaia ozarkensis — Burch (1975), R.I. Johnson (1980), IUCN (2011)

Pleurobema brevis subelliptica Simpson, 1900
Simpson, 1900. Proc. Acad. Nat. Sci. 52: 80.
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 763 [as ‘subilliptica’].
Simpson, 1914. Descr. Cat. Naiades: 801.
(intro'd as intra-sp. of Unio brevis Lea, 1872)
Type(s): LECTOTYPE USNM_159952, Hardy, Ark.

Pleurobema (s.s.) brevis var. subilliptica [sic] — Simpson (1900)
Pleurobema brevis subelliptica — Simpson (1900)
Pleurobema (s.s.) breve var. subellipticum — Simpson (1914)
Quadrula (Fusconia [sic]) subelliptica — Frierson (1927)
Fusconaia subelliptica — Haas (1969)
Fusconaia ozarkensis — Burch (1975), R.I. Johnson (1980), IUCN (2011)

Pleurobema utterbackii Utterback, 1915
Frierson in Utterback, 1915. Amer. Midl. Nat. 4(5): 197, pl. 5, fig. 12a-b; pl 20, figs. 63A-D.
Frierson, 1927. Check List N. Amer. Naiades: 57, sp. 247 [as ‘Q. (Fusconaia) utterbackii’].
Type(s): HOLOTYPE (ORIG. DESIG.) MCZ_271448, White R., Hollister, Taney Co., Missouri.

Pleurobema utterbackii — Utterback (1915)
Quadrula (Fusconia [sic]) utterbackii — Frierson (1927)
Fusconaia utterbackii — Haas (1969)
Fusconaia ozarkensis — Burch (1975), R.I. Johnson (1980), IUCN (2011)

Quadrula (Fusconaia) flava sampsoniana Frierson, 1927
Frierson, 1927. Check List N. Amer. Naiades: 55, sp. 235d.
(intro'd as intra-sp. of Obliquaria (Quadrula) flava Rafinesque, 1820)
Type(s): LECTOTYPE UMMZ_92226 (by R.I. Johnson, 1972: 149), Elk River, Missouri.

Quadrula (Fusconia [sic]) flava-sampsoniana — Frierson (1927)
Fusconaia flava sampsoniana — Haas (1969)
Fusconaia ozarkensis — R.I. Johnson (1980)
Fusconaia flava — Parmalee & Bogan (1998)

Pleurobema brevis var. subilliptica Simpson, 1900
Simpson, 1900. Proc. U.S. Nat. Mus. 22: 763.
(error for Pleurobema brevis subelliptica Simpson, 1900)

Pleurobema (s.s.) breve var. subellipticum — Simpson (1914)