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.

Truncilla truncata — Rafinesque (1820), Ortmann & Walker (1922), Ortmann (1924), Ortmann (1925), ..., Graf & Cummings (2021), Hopper et al. (2023), Saxon et al. (2023), Wu et al. (2023)
Potamilus truncatus — Rafinesque (1818)
Unio (Truncilla) truncata — Rafinesque (1819)
Unio truncatus — Ferussac (1835), Conrad (1853), Küster (1861)
Plagiola truncata — Agassiz (1852)
Plagiola elegans — Vanatta (1915)
Amygdalonaias truncata — Utterback (1916), Ortmann (1918)
Truncilla vermiculata — Morrison (1969)
Truncilla trincata — Soliman et al. (2016)

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)

Truncilla truncata var. vermiculata — Rafinesque (1820)
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 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 var. fusca — Rafinesque (1820)
Truncilla truncata — Haas (1969), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

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

Truncilla metaplata — Rafinesque (1831), Simpson (1900), Simpson (1914)
Unio metaplata — Ferussac (1835)
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)

Truncilla metaplata var. vittata — 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.

Unio elegans — Lea (1831), Jay (1835), Hanley (1843), Lapham (1860), ..., Singley (1893), Call (1895), Pilsbry & Rhoads (1896), de Gregorio (1914)
Unio truncatus — Ferussac (1835), Conrad (1853), Küster (1861)
Margarita (Unio) elegans — Lea (1836), Lea (1838)
Margaron (Unio) elegans — Lea (1852), Lea (1870)
Unio (Lampsilis) elegans — Adams & Adams (1857)
Plagiola (Amygdalonaias) elegans — Simpson (1900), Simpson (1914)
Unio (s.s.) elegans — Call (1900)
Plagiola (Amygdalonajas) elegans — Ortmann (1909)
Plagiola elegans — Ortmann (1910), Vanatta (1915)
Amygdalonajas elegans — Ortmann (1912), Ortmann (1914)
Amygdalonaias truncata — Utterback (1916), Ortmann (1918)
Truncilla truncata — Ortmann & Walker (1922), Ortmann (1924), Frierson (1927), F.C. Baker (1928), ..., 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)

Unio truncatus — Say (1834)
Margaron (Unio) elegans — Lea (1852), Lea (1870)
Unio elegans — Sowerby (1868), Call (1895)
Plagiola (Amygdalonaias) elegans — Simpson (1900), Simpson (1914)
Truncilla truncata — 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 melaplata — Lea (1836)

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 var. lacustris — F.C. Baker (1928)
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 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)

Unio elegans var. elagantopsis — Williams et al. (2008)

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

Truncilla trincata — Soliman et al. (2016)

Taxonomic History (since 1900)

Truncilla metaplata — Simpson (1900), Simpson (1914)
Plagiola (Amygdalonaias) elegans — Simpson (1900), Simpson (1914)
Unio (s.s.) elegans — Call (1900)
Plagiola (Amygdalonajas) elegans — Ortmann (1909)
Plagiola elegans — Ortmann (1910), Vanatta (1915)
Amygdalonajas elegans — Ortmann (1912), Ortmann (1914)
Unio elegans — de Gregorio (1914)
Unio elegans var. elegantopsis — de Gregorio (1914)
Unio elegans var. magnelegans — de Gregorio (1914)
Amygdalonaias truncata — Utterback (1916), Ortmann (1918)
Truncilla truncata — Ortmann & Walker (1922), Ortmann (1924), Ortmann (1925), Frierson (1927), ..., Graf & Cummings (2021), Hopper et al. (2023), Saxon et al. (2023), Wu et al. (2023)
Truncilla truncata-vermiculata — Frierson (1927)
Dysnomia (Penita) arcaeformis — Frierson (1927), Haas (1969)
Truncilla truncata var. lacustris — F.C. Baker (1928)
Truncilla truncata lacustris — F.C. Baker (1928)
Truncilla vermiculata — Morrison (1969)
Unio elegans var. elagantopsis — Williams et al. (2008)
Truncilla trincata — Soliman et al. (2016)