Unio ellipsiformis Conrad, 1836
Conrad, 1836. Monogr. Fam. Unionidae 1(7): 60, pl. 34, fig. 1.
Type(s): HOLOTYPE ANSP_42114, Michigan.

Lampsilis (sec. Eurynia) ellipsiformis — Simpson (1900)
Lampsilis (Eurynia) ellipsiformis — Simpson (1914)
Nephronaias ellipsiformis — Utterback (1916)
Eurynia (Micromya) ellipsiformis — Ortmann (1918)
Lampsilis (Venusta) ellipsiformis — Frierson (1927)
Ligumia (Micromya) ellipsiformis — F.C. Baker (1928)
Lampsilis (Venustaconcha) ellipsiformis — Haas (1969)
Actinonaias ellipsiformis — Burch (1975), Gordon et al. (1979), Mathiak (1979), R.I. Johnson (1980), ITIS (2012)
Venustaconcha ellipsiformis ellipsiformis — Oesch (1984), Watters (2018)
Venustaconcha ellipsiformis — Turgeon et al. (1988), Cummings & Mayer (1992), Williams et al. (1993), Strayer & Jirka (1997), Cummings & Mayer (1997), ... Wu et al. (2024), Dai et al. (2024), Dai et al. (2024), Wu et al. (2024), Dai et al. (2025)
V. ellipsiformis — Sheng et al. (2014)

Unio venustus Lea, 1838
Lea, 1836. Synopsis Fam. Naiades: 24. [nomen nudum]
Lea, 1838. Trans. Amer. Phil. Soc. 6 [O. 2]: 4, pl. 2, fig. 4.
Type(s): HOLOTYPE USNM_84971, Potosi, Missouri.

Lampsilis (sec. Eurynia) venustus — Simpson (1900)
Lampsilis (Eurynia) venusta — Simpson (1914)
Nephronaias ellipsiformis venusta — Utterback (1916)
Eurynia (Micromya) venusta — Ortmann (1918)
Lampsilis (Venusta) venusta — Frierson (1927)
Lampsilis (sec. Venustaconcha) venusta — Thiele (1934)
Lampsilis (Venustaconcha) venusta — Haas (1969), Haas (1969)
Actinonaias ellipsiformis — R.I. Johnson (1980)
Venustaconcha ellipsiformis pleasii — Oesch (1984)
Venustaconcha ellipsiformis — Graf & Cummings (2007), Watters et al. (2009), Graf & Cummings (2021)
Venustaconcha ellipsiformis ellipsiformis — Watters (2018)

Unio spatulatus Lea, 1845
Lea, 1845. Proc. Amer. Phil. Soc. 4: 164.
Lea, 1848. Trans. Amer. Phil. Soc. 10 [O. 4]: 80 [54], pl. 8, figs. 22.
Type(s): FIGURED SYNTYPE USNM_84982, Rock R., Wis.

Lampsilis (sec. Eurynia) ellipsiformis — Simpson (1900)
Unio (s.s.) spatulatus — Call (1900)
Lampsilis (Eurynia) ellipsiformis — Simpson (1914)
Nephronaias ellipsiformis — Utterback (1916)
Lampsilis (Venusta) ellipsiformis — Frierson (1927)
Ligumia (Micromya) ellipsiformis — F.C. Baker (1928)
Lampsilis (Venustaconcha) ellipsiformis — Haas (1969)
Venustaconcha ellipsiformis ellipsiformis — Oesch (1984)
Venustaconcha ellipsiformis — Strayer & Jirka (1997), Watters et al. (2009)

Venustaconcha pleasii Campbell et al., 2005
‘Marsh’ of Authors.
Campbell et al., 2005. Invert. Biol. 124(2): 155.
Zanatta & Murphy, 2006. MPE 41(1): 198.
Gangloff et al., 2013. Conserv. Genet. 14: 915. [in part]
(misidentified reference to Unio pleasii Marsh, 1891)

Venustaconcha pleasii — Campbell & Lydeard (2012)

Unio spathulatus Küster, 1862
‘Lea’ Küster, 1862. Conchyl. Cab. 9(2): 261.
(error for Unio spatulatus Lea, 1845)