species Truncilla donaciformis (Lea, 1828): synonymy

Unio donaciformis Lea, 1828

Lea, 1828. Trans. Amer. Phil. Soc. 3 [O. 1]: 267 [9], pl. 4, fig. 3.
HOLOTYPE USNM_84457, Cincinnati, Ohio.

Plagiola (Amygdalonaias) donaciformis — Simpson (1900)
Unio (s.s.) donaciformis — Call (1900)
Plagiola (Amygdalonajas) [sic] donaciformis — Ortmann (1909)
Plagiola (Amygdalonaias) (Group of P. donaciformis) donaciformis — Simpson (1914)
Amygdalonajas [sic] donaciformis — Ortmann (1914)
Amygdalonaias donaciformis — Utterback (1916)
Truncilla donaciformis — Ortmann & Walker (1922), Ortmann (1924), Ortmann (1925), Frierson (1927), F.C. Baker (1928), ... de Moulpied et al. (2022), Hopper et al. (2023), Saxon et al. (2023), FMCS (2025), Campbell & Lydeard (2026)
Truncilla dociformes [sic] — Hauck et al. (2023)

Unio zigzag Lea, 1829

Lea, 1829. Trans. Amer. Phil. Soc. 3 [O. 1]: 440, pl. 12, fig. 19 [as ‘zig-zag’].
FIGURED SYNTYPE USNM_84459, Cincinnati, Ohio.

Plagiola (Amygdalonaias) donaciformis — Simpson (1900)
Unio (s.s.) donaciformis — Call (1900)
Plagiola (Amygdalonaias) (Group of P. donaciformis) donaciformis — Simpson (1914)
Unio zig-zag — de Gregorio (1914)
Amygdalonaias donaciformis — Utterback (1916)
Truncilla donaciformis — Ortmann & Walker (1922), Frierson (1927), F.C. Baker (1928), Murray & Leonard (1962), Haas (1969), ... Parmalee & Bogan (1998), R.I. Johnson (1999), Williams et al. (2008), Watters et al. (2009), IUCN (2012)

Unio nervosa ‘Rafinesque’ of Authors

(misidentified reference to Unio (Leptodea) nervosa Rafinesque, 1820)
‘Rafinesque’ of Authors.
Conrad, 1834. New Fresh-Water Shells: 70.
Say, 1834. Amer. Conch. 1(6): sp. 6 [synonymy].
Lapham, 1852. Trans. WI Agri. Soc. 2: 369.
Agassiz, 1852. Arch. Naturg. 18(1): 48.
Conrad, 1853. Proc. Acad. Nat. Sci. 6: 252.

Plagiola (Amygdalonaias) donaciformis — Simpson (1900)
Plagiola (Amygdalonaias) (Group of P. donaciformis) donaciformis — Simpson (1914)
Truncilla donaciformis — Frierson (1927), F.C. Baker (1928), Haas (1969), Parmalee & Bogan (1998), Watters et al. (2009)

Unio ziczac ‘Lea’ of Authors

(error for Unio zigzag Lea, 1829)
‘Lea’ of Authors.
Hanley, 1843. Illustr. Descr. Cat. Rec. Bivalve Shells: 183.
Sowerby, 1866. Conch. Icon. 16: pl. 34, sp. 213.

Truncilla donaciformis — Frierson (1927)

Unio zig-zag var. illius de Gregorio, 1914

(intro'd as intra-sp. of Unio zigzag Lea, 1829)
de Gregorio, 1914. Il Nat. Siciliano 2: 41, pl. 4, figs. 3a-c.

Unio zig-zag var. illius — de Gregorio (1914)
Truncilla donaciformis — Watters et al. (2009)

Truncilla dociformes Hauck et al., 2023

(error for Unio donaciformis Lea, 1828)
Hauck et al., 2023. PeerJ 11: fig. 7.