Truncilla truncata Rafinesque, 1820
Rafinesque, 1818. Amer. Mon. Mag. 3: 355 [as ‘Potamilus truncatus’]. [nomen nudum]
Rafinesque, 1819. Jour. Phys. Chim. Hist. Nat. 88: 427 [as ‘U. (Truncilla) truncata’]. [nomen nudum]
Rafinesque, 1820. Ann. Gén. Sci. Phys. 5 (13): 301 [also as ‘Unio truncata’].
Rafinesque, 1864. [in] Binney & Tryon, reprint: 22, 29, 46.
Type(s): LECTOTYPE ANSP_20217, Falls of Ohio.

Plagiola elegans — Vanatta (1915)
Amygdalonaias truncata — Utterback (1916), Ortmann (1918)
Truncilla truncata — Ortmann & Walker (1922), Ortmann (1924), Ortmann (1925), Frierson (1927), F.C. Baker (1928), ... FMCS (2021), Wu et al. (2021), Hopper et al. (2023), Saxon et al. (2023), Wu et al. (2023)
Truncilla vermiculata — Morrison (1969)
Truncilla trincata [sic] — Soliman et al. (2016)

Truncilla truncata var. fusca Rafinesque, 1820
Rafinesque, 1820. Ann. Gén. Sci. Phys. 5 (13): 301.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 46.
(intro'd as intra-sp. of Truncilla truncata Rafinesque, 1820)

Truncilla truncata — Haas (1969), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

Truncilla truncata var. vermiculata Rafinesque, 1820
Rafinesque, 1820. Ann. Gén. Sci. Phys. 5 (13): 301.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 46.
(intro'd as intra-sp. of Truncilla truncata Rafinesque, 1820)

— Vanatta (1915)
Truncilla truncata-vermiculata — Frierson (1927)
Truncilla truncata — Haas (1969), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)
Truncilla vermiculata — Morrison (1969)

Truncilla metaplata Rafinesque, 1831
Rafinesque, 1831. Continuation: 4.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 77.
Type(s): LECTOTYPE ANSP_20258, Cumberland River.

Truncilla metaplata — Simpson (1900), Simpson (1914)
Plagiola elegans — Vanatta (1915)
Dysnomia (Penita) arcaeformis — Frierson (1927), Haas (1969)

Truncilla metaplata var. vittata Rafinesque, 1831
Rafinesque, 1831. Continuation: 4.
Rafinesque, 1864. [in] Binney & Tryon, reprint: 77.
(intro'd as intra-sp. of Truncilla metaplata Rafinesque, 1831)

Unio elegans Lea, 1831
Lea, 1831. Trans. Amer. Phil. Soc. 4 [O. 1]: 83 [93], pl. 9, fig. 13.
Type(s): HOLOTYPE USNM_84449, Cincinnati, Ohio.

Plagiola (Amygdalonaias) elegans — Simpson (1900), Simpson (1914)
Unio (s.s.) elegans — Call (1900)
Plagiola (Amygdalonajas) [sic] elegans — Ortmann (1909)
Plagiola elegans — Ortmann (1910), Vanatta (1915)
Amygdalonajas [sic] elegans — Ortmann (1912), Ortmann (1914)
Unio elegans — de Gregorio (1914)
Amygdalonaias truncata — Utterback (1916), Ortmann (1918)
Truncilla truncata — Ortmann & Walker (1922), Ortmann (1924), Frierson (1927), F.C. Baker (1928), Murray & Leonard (1962), ... Howells et al. (1996), Strayer & Jirka (1997), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

Unio truncatus Say, 1834
‘Rafinesque’ Say, 1834. Amer. Conch. 6: ??.
‘Rafinesque’ Say, 1838. Amer. Conch. 7: pl. 67.
(reference to Truncilla truncata Rafinesque, 1820)

Plagiola (Amygdalonaias) elegans — Simpson (1900), Simpson (1914)
Truncilla truncata — Watters et al. (2009)

Unio elegans var. elegantopsis de Gregorio, 1914
de Gregorio, 1914. Il Nat. Siciliano 2: 41, pl. 4, figs. 6a-b.
(intro'd as intra-sp. of Unio elegans Lea, 1831)

Unio elegans var. elegantopsis — de Gregorio (1914)
Truncilla truncata — Williams et al. (2008), Watters et al. (2009)

Unio elegans var. magnelegans de Gregorio, 1914
de Gregorio, 1914. Il Nat. Siciliano 2: 41, pl. 5, figs. 1a-c.
(intro'd as intra-sp. of Unio elegans Lea, 1831)

Unio elegans var. magnelegans — de Gregorio (1914)
Truncilla truncata — Williams et al. (2008), Watters et al. (2009)

Truncilla truncata var. lacustris F.C. Baker, 1928
F.C. Baker, 1928. Bull. Wisconsin Geol. Nat. Hist. Survey 70(2): 227, pl. 78, figs. 1-2.
(intro'd as intra-sp. of Truncilla truncata Rafinesque, 1820)
Type(s): HOLOTYPE (ORIG. DESIG.) UMMZ_209214, Lake Winnebago, Wisconsin.

Truncilla truncata lacustris — F.C. Baker (1928)
Truncilla truncata — Haas (1969), R.I. Johnson (1980), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

Unio melaplata Lea, 1836
‘Rafinesque’ Lea, 1836. Synopsis Fam. Naiades: 59.
‘Rafinesque’ Lea, 1852. Synopsis Fam. Naiades: 58.
‘Rafinesque’ Lea, 1870. Synopsis Fam. Naiades: 92.
(error for Truncilla metaplata Rafinesque, 1831)

Unio elegans var. elagantopsis Williams et al., 2008
‘de Gregorio’ Williams et al., 2008. Freshw. Mussels AL and Mobile Basin: 739.
(error for Unio elegans var. elegantopsis de Gregorio, 1914)

Truncilla trincata Soliman et al., 2016
Soliman et al., 2016. Egypt. J. Zool. 66: 121.
(error for Truncilla truncata Rafinesque, 1820)