Unio nasutus Say, 1817
Lister, 1685. Conch.: pl. 151, fig. 6.
Say, 1817. Nich. Encyc. 2: [12,] pl. 4, fig. 1.
Say, 1819. Nich. Encyc. 4: [18,] pl. 4, fig. 1.
Say, 1858. [in] Binney, Compl. Writings T. Say: 52.
Type(s): USNM_85978, Bristol, Pa.

Lampsilis (sec. Eurynia) nasutus — Simpson (1900)
Lampsilis nasuta — Ortmann (1909), Ortmann (1909), Ortmann (1910)
Eurynia (s.s.) nasuta — Ortmann (1912)
Lampsilis (Eurynia) nasuta — Simpson (1914)
— de Gregorio (1914)
Lampsilis (Ligumia) nasuta — Frierson (1927)
Unio nasutus — Henderson (1935)
Ligumia nasuta — Haas (1969), R.I. Johnson (1970), Burch (1975), R.I. Johnson (1980), Mackie et al. (1980), ... Jones (2015), Scott et al. (2016), Williams et al. (2017), Gasparini et al. (2020), Hata et al. (2022)
Sagittunio nasutus — Watters (2018), Burlakova et al. (2019), Scott et al. (2020), Graf & Cummings (2021), FMCS (2021), Hopper et al. (2023), FMCS (2025)

Obliquaria (Ellipsaria) attenuata Rafinesque, 1820
Rafinesque, 1820. Ann. Gén. Sci. Phys. 5 (13): 305, footnote.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 49.

— Simpson (1900), Simpson (1914)
Lampsilis (Ligumia) nasuta — Frierson (1927)
Ligumia nasuta — Haas (1969), R.I. Johnson (1970), Burch (1975), Strayer & Jirka (1997), Watters et al. (2009)
Sagittunio nasutus — Watters (2018)

Unio rostrata Valenciennes, 1827
Valenciennes, 1827. Receuil Observ. Zool. 2(11-12): 233, pl. 53, fig. 3.
(misidentified reference to Unio rostrata Lamarck, 1819)

Lampsilis (sec. Eurynia) nasutus — Simpson (1900)
Lampsilis (Eurynia) nasuta — Simpson (1914)
Lampsilis (Ligumia) nasuta — Frierson (1927)
Ligumia nasuta — Haas (1969), R.I. Johnson (1970), Burch (1975), Watters et al. (2009)
Sagittunio nasutus — Watters (2018)

Unio nasutoides Lea, 1868
Lea, 1868. Proc. Acad. Nat. Sci. 20: 163.

Unio nasutus — Henderson (1935)

Unio vaughanianus Sowerby, 1868
‘Lea’ Sowerby, 1868. Conch. Icon. 16: pl. 61, sp. 308.
(misidentified reference to Unio vaughanianus Lea, 1838)

Lampsilis (sec. Eurynia) nasutus — Simpson (1900)
Lampsilis (Eurynia) nasuta — Simpson (1914)
Lampsilis (Ligumia) nasuta — Frierson (1927)
Ligumia nasuta — R.I. Johnson (1970), Burch (1975), Watters et al. (2009)
Sagittunio nasutus — Watters (2018)

Unio nasutus Conrad, 1838
‘Say’ Conrad, 1838. Monogr. Fam. Unionidae 2(11): 38, pl. 18, fig. 1 [lower]. [in part]
(reference to Unio nasutus Say, 1817)

Lampsilis (sec. Eurynia) nasutus — Simpson (1900)
Lampsilis (Eurynia) nasuta — Simpson (1914)

Unio fisherianus Küster, 1861
‘Lea’ Küster, 1861. Conchyl. Cab. 9(2): 205, pl. 68, fig. 6.
(misidentified reference to Unio fisherianus Lea, 1838)

Unio (sec. Elliptio) fisherianus — Simpson (1900), Simpson (1914)
Lampsilis (Ligumia) nasuta — Frierson (1927)
Ligumia nasuta — R.I. Johnson (1970)