Unio (Eurynia) dilatata Rafinesque, 1820
Rafinesque, 1819, Jour. Phys. Chim. Hist. Nat. 88: 426. [nomen nudum]
Rafinesque, 1820, Ann. Gén. Sci. Phys. 5 (13): 297 [also as ‘Elliptio dilatata’].
Rafinesque, 1864, [in] Binney & Tryon, reprint: 29, 42.
(renamed Obliquaria violacea Rafinesque, 1831)
Type(s): LECTOTYPE ANSP_20248, Kentucky River.

Unio (Eurynia) dilatata — Rafinesque (1819), Rafinesque (1820)
Obliquaria violacea — Rafinesque (1831)
Unio dilatatus — Ferussac (1835), Conrad (1836), Küster (1848), Conrad (1853)
Margarita (Unio) gibbosus — Lea (1836), Lea (1838)
Unio nasutus — Agassiz (1852)
Margaron (Unio) gibbosus — Lea (1852), Lea (1870)
Unio (Elliptio) dilatatus — Mörch (1853)
Elliptio dilatata — Utterback (1915), Mackie et al. (1980), R.I. Johnson (1980), Oesch (1984), ..., Huang et al. (2019), Gasparini et al. (2020), Klymus et al. (2020), Jeratthitikul et al. (2022)
Unio dilatata — Vanatta (1915)
Elliptio dilatatus — Ortmann (1918), Ortmann & Walker (1922), Ortmann (1924), Ortmann (1925), F.C. Baker (1928), Murray & Leonard (1962), Mathiak (1979), Gordon et al. (1979)
Elliptio (Eurynaia) dilatatus — Frierson (1927)
Elliptio (Eurynia) dilatatus — Haas (1930)
Elliptio (s.s.) dilatata — Thiele (1934), Burch (1975)
Elliptio (Eurynia) nasutus nasutus — Haas (1969)
Elliptio sp. — Caveney et al. (2006)
Eurynia dilatata — Campbell & Lydeard (2012), Williams et al. (2017), Inoue et al. (2018), Pieri et al. (2018), Inoue et al. (2020), Smith et al. (2020), Graf & Cummings (2021), FMCS (2021), Hopper et al. (2023)
Elliptio (Eurynia) dilatata — Campbell & Lydeard (2012), Burlakova et al. (2012), Perkins et al. (2017)
Eurynia (Elliptio) dilatata — Porto-Hannes et al. (2021)

Obliquaria (Ellipsaria) atroviolacea Rafinesque, 1820
Rafinesque, 1820, Ann. Gén. Sci. Phys. 5 (13): 321.
Rafinesque, 1864, [in] Binney & Tryon, reprint: 63.

Obliquaria (Ellipsaria) atroviolacea — Rafinesque (1820)
Unio dilatatus — Ferussac (1835), Conrad (1836), Conrad (1853)
Obliquaria atroviolacea — Burch (1975)

Obliquaria (Ellipsaria) sinuata Rafinesque, 1820
Rafinesque, 1820, Ann. Gén. Sci. Phys. 5 (13): 321 [also as ‘Unio sinuata’].
Rafinesque, 1864, [in] Binney & Tryon, reprint: 63.
(renamed Unio cultratus Rafinesque, 1831)
Type(s): LECTOTYPE ANSP_20252, Kentucky River.

Obliquaria (Ellipsaria) sinuata — Rafinesque (1820)
Bariosta cultratus — Rafinesque (1831)
Unio phaseolus — Ferussac (1835)
Unio fasciolaris — Conrad (1853)
Unio dilatata — Vanatta (1915)
Ptychobranchus (s.s.) fasciolare — Frierson (1927)
Obliquaria sinuata — Burch (1975)
Elliptio dilatata — Watters et al. (2009)

Unio nasuta Lamarck, 1819
Lamarck, 1819, Hist. Natur. Anim. sans Vert. 6: 75, sp. 22.
(homonym of Unio nasutus Say, 1817)
Type(s): SYNTYPE MNHN_MPL_0022, rapporte Lac Erie.

Unio nasuta — Lamarck (1819)
Unio rectus — Lea (1829)
Unio gibbosus — Lea (1834), Hanley (1843)
Unio dilatatus — Ferussac (1835), Conrad (1836), Küster (1848), Conrad (1853)
Margarita (Unio) gibbosus — Lea (1836), Lea (1838)
Mysca nasuta — Schlüter (1838)
Unio nasutus — Agassiz (1852)
Margaron (Unio) gibbosus — Lea (1852), Lea (1870)
Unio (Elliptio) dilatatus — Mörch (1853)
Unio (sec. Elliptio) gibbosus — Simpson (1900), Simpson (1914)
Elliptio (Eurynaia) dilatatus — Frierson (1927)
Elliptio (Eurynia) nasutus nasutus — Haas (1969)
Elliptio dilatata — Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

Bariosta fulvus Rafinesque, 1831
Rafinesque, 1831, Continuation: 3.
Rafinesque, 1864, [in] Binney & Tryon, reprint: 74.

Bariosta fulvus — Rafinesque (1831)
Unio fulvus — Ferussac (1835)
Elliptio (Eurynaia) dilatatus-fulvus — Frierson (1927)
Elliptio (Eurynia) nasutus fulvus — Haas (1969)
Elliptio dilatata — Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

Unio gibbosus var. armathwaitensis B.H. Wright, 1898
B.H. Wright, 1898, Nautilus 11: 123.
(intro'd as intra-sp. of Unio gibbosus Barnes, 1823)
Type(s): LECTOTYPE USNM_150523, Armathwaite, Fentress Co., Tenn.

Unio gibbosus var. armathwaitensis — B.H. Wright (1898)
Unio (sec. Elliptio) gibbosus var. armathwaitensis — Simpson (1900), Simpson (1914)
Elliptio (Eurynaia) dilatatus-armathwaitensis — Frierson (1927)
Elliptio (Eurynia) nasutus armathwaitensis — Haas (1969)
Elliptio dilatata — Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

Unio (sec. Elliptio) gibbosus var. delicatus Simpson, 1900
Simpson, 1900, Proc. U.S. Nat. Mus. 22: 704.
Simpson, 1914, Descr. Cat. Naiades: 600.
(intro'd as intra-sp. of Unio gibbosus Barnes, 1823; homonym of Unio delicatus Lea, 1863)
Type(s): LECTOTYPE USNM_128797, St. Francis R., Greenway, Clay Co., Arkansas.

Unio (sec. Elliptio) gibbosus var. delicatus — Simpson (1900), Simpson (1914)
Elliptio dilatata delicata — Utterback (1915)
Elliptio (Eurynaia) dilatatus-delicatus — Frierson (1927)
Elliptio dilatatus delicatus — F.C. Baker (1928)
Elliptio (Eurynia) nasutus delicatus — Haas (1969)
Elliptio dilatata — R.I. Johnson (1980), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

Obliquaria (Ellipsaria) cuprea Rafinesque, 1820
Rafinesque, 1820, Ann. Gén. Sci. Phys. 5 (13): 304, pl. 81, figs. 8-9 [also as ‘U. cuprea’].
Rafinesque, 1864, [in] Binney & Tryon, reprint: 48.

Obliquaria (Ellipsaria) cuprea — Rafinesque (1820)
Unio dilatatus — Ferussac (1835), Conrad (1836), Conrad (1853)
Elliptio dilatatus — Ortmann & Walker (1922)
Elliptio (s.s.) dilatata — R.I. Johnson (1970), Burch (1975)

Unio gibbosus Barnes, 1823
Barnes, 1823, Amer. J. Sci. 6 (1-2): 262, pl. 11, figs. 12a-b.

Unio gibbosus — Barnes (1823), Hildreth (1828), Lea (1829), Ravenel (1834), ..., Ortmann (1909), Ortmann (1909), Ortmann (1909), Ortmann (1910)
Unio dilatatus — Ferussac (1835), Conrad (1836), Küster (1848), Conrad (1853)
Margarita (Unio) gibbosus — Lea (1836), Lea (1838)
Unio (s.s.) gibbosus — Swainson (1840), Call (1900)
Unio nasutus — Agassiz (1852)
Margaron (Unio) gibbosus — Lea (1852), Lea (1870)
Unio (Elliptio) dilatatus — Mörch (1853)
Unio (Limnium sec. Eurynia) gibbosus — Fischer (1887)
Unio (sec. Elliptio) gibbosus — Simpson (1900), Simpson (1914)
Elliptio gibbosus — Ortmann (1911), Ortmann (1912)
Elliptio dilatata — Utterback (1915), R.I. Johnson (1980), Oesch (1984), Vidrine (1993), Howells et al. (1996), Strayer & Jirka (1997), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)
Unio dilatata — Vanatta (1915)
Elliptio dilatatus — Ortmann (1918), Ortmann & Walker (1922), F.C. Baker (1928), Murray & Leonard (1962)
Elliptio (Eurynaia) dilatatus — Frierson (1927)
Elliptio (Eurynia) dilatatus — Haas (1930)
Elliptio (s.s.) dilatata — Thiele (1934), Burch (1975)
Elliptio (Eurynia) nasutus nasutus — Haas (1969)

Unio mucronatus Barnes, 1823
Barnes, 1823, Amer. J. Sci. 6 (1-2): 266, pl. 13, fig. 13.

Unio mucronatus — Barnes (1823), Agassiz (1852)
Unio gibbosus — Lea (1829), Hanley (1843)
Unio phaseolus — Ferussac (1835)
Margarita (Unio) gibbosus — Lea (1836), Lea (1838)
Margaron (Unio) gibbosus — Lea (1852), Lea (1870)
Unio fasciolaris — Conrad (1853)
Unio (sec. Elliptio) gibbosus — Simpson (1900), Simpson (1914)
Lampsilis (Venusta) ellipsiformis — Frierson (1927)
Elliptio dilatatus — F.C. Baker (1928)
Lampsilis (Venustaconcha) ellipsiformis — Haas (1969)
Elliptio dilatata — Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

Bariosta fulvus var. fuscata Rafinesque, 1831
Rafinesque, 1831, Continuation: 3.
Rafinesque, 1864, [in] Binney & Tryon, reprint: 74.
(intro'd as intra-sp. of Bariosta fulvus Rafinesque, 1831)

Bariosta fulvus var. fuscata — Rafinesque (1831)

Bariosta fulvus var. rufa Rafinesque, 1831
Rafinesque, 1831, Continuation: 3.
Rafinesque, 1864, [in] Binney & Tryon, reprint: 74.
(intro'd as intra-sp. of Bariosta fulvus Rafinesque, 1831)

Bariosta fulvus var. rufa — Rafinesque (1831)

Obliquaria bicolor Rafinesque, 1831
Rafinesque, 1831, Continuation: 3.
Rafinesque, 1864, [in] Binney & Tryon, reprint: 75.

Obliquaria bicolor — Rafinesque (1831)
Unio phaseolus — Ferussac (1835)
Elliptio (Eurynaia) dilatatus — Frierson (1927)
Elliptio (Eurynia) nasutus nasutus — Haas (1969)
Elliptio dilatata — Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

Obliquaria violacea Rafinesque, 1831
Rafinesque, 1831, Continuation: 3.
Rafinesque, 1864, [in] Binney & Tryon, reprint: 75.
(new name for Unio (Eurynia) dilatata Rafinesque, 1820)

Obliquaria violacea — Rafinesque (1831)
Elliptio (Eurynaia) dilatatus — Frierson (1927)
Elliptio (Eurynia) nasutus nasutus — Haas (1969)
Elliptio dilatata — Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

Unio cultratus Rafinesque, 1831
Rafinesque, 1831, Continuation: 4.
Rafinesque, 1864, [in] Binney & Tryon, reprint: 77.
(new name for Obliquaria (Ellipsaria) sinuata Rafinesque, 1820)

Unio cultratus — Rafinesque (1831)
Bariosta cultratus — Rafinesque (1831)
Ptychobranchus (s.s.) fasciolare — Frierson (1927)

Unio euliratus Rafinesque, 1831
Rafinesque, 1831, Continuation: 4.

Unio euliratus — Rafinesque (1831)
Elliptio dilatata — Watters et al. (2009)

Unio dilatatus Say, 1834
‘Rafinesque’ of Authors.
Say, 1834, Amer. Conch. 6: ??.
Conrad, 1836, Monogr. Fam. Unionidae 1(5): 42, pl. 21.
(reference to Unio (Eurynia) dilatata Rafinesque, 1820)

Unio dilatatus — Say (1834), Küster (1848)
Margarita (Unio) gibbosus — Lea (1836), Lea (1838)
Unio gibbosus — Hanley (1843), Call (1895)
Margaron (Unio) gibbosus — Lea (1852), Lea (1870)
Unio (sec. Elliptio) gibbosus — Simpson (1900), Simpson (1914)
Elliptio dilatata — Watters et al. (2009)

Unio arctatus Ferussac, 1835
‘Conrad’ Ferussac, 1835, Mag. Zool. 5: 29.
(misidentified reference to Unio arctatus Conrad, 1834)

Unio arctatus — Ferussac (1835)
Unio (sec. Elliptio) gibbosus — Simpson (1900), Simpson (1914)
Elliptio (Eurynaia) dilatatus — Frierson (1927)
Elliptio (Eurynia) nasutus nasutus — Haas (1969)

Unio torulosus Ferussac, 1835
‘Rafinesque’ Ferussac, 1835, Mag. Zool. 5: 28.
(misidentified reference to Amblema torulosa Rafinesque, 1820)

Unio torulosus — Ferussac (1835), Conrad (1853)
Unio (sec. Elliptio) gibbosus — Simpson (1900), Simpson (1914)

Unio arctior Lea, 1838
Lea, 1836, Synopsis Fam. Naiades: 39. [nomen nudum]
Lea, 1838, Trans. Amer. Phil. Soc. 6 [O. 2]: 10, pl. 4, fig. 10.
Type(s): HOLOTYPE USNM_86103, Ohio R., Cincinnati, Ohio.

Unio arctior — Lea (1838), Hanley (1843), Conrad (1853), Adams & Adams (1857), Küster (1861), Sowerby (1868), B.H. Wright (1888), de Gregorio (1914)
Margarita (Unio) arctior — Lea (1836), Lea (1838)
Margaron (Unio) arctior — Lea (1852), Lea (1870)
Unio (s.s.) arctior — Paetel (1890)
Unio gibbosus — Call (1895)
Unio (sec. Elliptio) gibbosus — Simpson (1900), Simpson (1914)
Unio (s.s.) gibbosus — Call (1900)
Elliptio dilatata — Utterback (1915), Oesch (1984), Howells et al. (1996), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)
Elliptio (Eurynaia) dilatatus — Frierson (1927)
Elliptio (Eurynia) nasutus nasutus — Haas (1969)

Unio stonensis Lea, 1840
Lea, 1840, Proc. Amer. Phil. Soc. 1: 286.
Lea, 1842, Trans. Amer. Phil. Soc. 8 [O. 3]: 195 [33], pl. 8, fig. 5.
Type(s): HOLOTYPE USNM_84969, Stone R., Tenn.

Unio stonensis — Lea (1840), Conrad (1853), Sowerby (1868), B.H. Wright (1888)
Margaron (Unio) stonensis — Lea (1852), Lea (1870)
Unio (Hyridella) stonensis — Adams & Adams (1857)
Unio gibbosus — Call (1895)
Unio (sec. Elliptio) stonensis — Simpson (1900), Simpson (1914)
Unio (s.s.) gibbosus — Call (1900)
Elliptio (Eurynaia) dilatatus — Frierson (1927)
Elliptio (Eurynia) nasutus nasutus — Haas (1969)
Elliptio dilatata — Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

Unio bicolar Lea, 1852
‘Rafinesque’ Lea, 1852, Synopsis Fam. Naiades: 57.
(error for Obliquaria bicolor Rafinesque, 1831)

Unio bicolar — Lea (1852)

Unio propeverutus de Gregorio, 1914
de Gregorio, 1914, Il Nat. Siciliano 2: 38, pl. 3, figs. 1a-d.

Unio propeverutus — de Gregorio (1914)
Elliptio dilatata — Williams et al. (2008), Watters et al. (2009)

Elliptio dilatata var. subgibbosa Utterback, 1915
‘Lea’ Utterback, 1915, Amer. Midl. Nat. 4(5): 202-203, pl. 21, figs. 68a-d.
(misidentified reference to Unio subgibbosus Lea, 1857)

Elliptio dilatata var. subgibbosa — Utterback (1915)
Elliptio dilatata — Parmalee & Bogan (1998), Watters et al. (2009)

Elliptio dilatata var. sterkii Grier, 1918
Grier, 1918, Nautilus 32(1): 9.
(intro'd as intra-sp. of Unio (Eurynia) dilatata Rafinesque, 1820)
Type(s): HOLOTYPE (ORIG. DESIG.) CM_61.4628, Presque Isle Bay, Erie, Erie County, Pennsylvania.

Elliptio dilatata var. sterkii — Grier (1918)
Elliptio dilatatus sterkii — F.C. Baker (1928)
Elliptio (Eurynia) nasutus nasutus — Haas (1969)
Elliptio (s.s.) dilatata — Burch (1975)
Elliptio dilatata — R.I. Johnson (1980), Strayer & Jirka (1997), Parmalee & Bogan (1998), Williams et al. (2008), Watters et al. (2009)

Unio arctiro Howells et al., 1996
‘Lea’ Howells et al., 1996, Freshw. Mussels Tex.: 51.
(error for Unio arctior Lea, 1838)

Unio arctiro — Howells et al. (1996)

Taxonomic History (since 1900)

Unio (sec. Elliptio) gibbosus — Simpson (1900), Simpson (1914)
Unio (s.s.) gibbosus — Call (1900)
Unio (sec. Elliptio) stonensis — Simpson (1900), Simpson (1914)
Unio (sec. Elliptio) gibbosus var. armathwaitensis — Simpson (1900), Simpson (1914)
Unio (sec. Elliptio) gibbosus var. delicatus — Simpson (1900), Simpson (1914)
Unio gibbosus — Ortmann (1909), Ortmann (1909), Ortmann (1909), Ortmann (1910)
Elliptio gibbosus — Ortmann (1911), Ortmann (1912)
Unio arctior — de Gregorio (1914)
Unio propeverutus — de Gregorio (1914)
Elliptio dilatata — Utterback (1915), Mackie et al. (1980), R.I. Johnson (1980), Oesch (1984), ..., Huang et al. (2019), Gasparini et al. (2020), Klymus et al. (2020), Jeratthitikul et al. (2022)
Unio dilatata — Vanatta (1915)
Elliptio dilatata delicata — Utterback (1915)
Elliptio dilatata var. subgibbosa — Utterback (1915)
Elliptio dilatatus — Ortmann (1918), Ortmann & Walker (1922), Ortmann (1924), Ortmann (1925), F.C. Baker (1928), Murray & Leonard (1962), Mathiak (1979), Gordon et al. (1979)
Elliptio dilatata var. sterkii — Grier (1918)
Elliptio (Eurynaia) dilatatus — Frierson (1927)
Ptychobranchus (s.s.) fasciolare — Frierson (1927)
Lampsilis (Venusta) ellipsiformis — Frierson (1927)
Elliptio (Eurynaia) dilatatus-fulvus — Frierson (1927)
Elliptio (Eurynaia) dilatatus-armathwaitensis — Frierson (1927)
Elliptio (Eurynaia) dilatatus-delicatus — Frierson (1927)
Elliptio dilatatus delicatus — F.C. Baker (1928)
Elliptio dilatatus sterkii — F.C. Baker (1928)
Elliptio (Eurynia) dilatatus — Haas (1930)
Elliptio (s.s.) dilatata — Thiele (1934), R.I. Johnson (1970), Burch (1975)
Elliptio (Eurynia) nasutus nasutus — Haas (1969)
Lampsilis (Venustaconcha) ellipsiformis — Haas (1969)
Elliptio (Eurynia) nasutus fulvus — Haas (1969)
Elliptio (Eurynia) nasutus armathwaitensis — Haas (1969)
Elliptio (Eurynia) nasutus delicatus — Haas (1969)
Obliquaria atroviolacea — Burch (1975)
Obliquaria sinuata — Burch (1975)
Unio arctiro — Howells et al. (1996)
Elliptio sp. — Caveney et al. (2006)
Eurynia dilatata — Campbell & Lydeard (2012), Williams et al. (2017), Inoue et al. (2018), Pieri et al. (2018), Inoue et al. (2020), Smith et al. (2020), Graf & Cummings (2021), FMCS (2021), Hopper et al. (2023)
Elliptio (Eurynia) dilatata — Campbell & Lydeard (2012), Burlakova et al. (2012), Perkins et al. (2017)
Eurynia (Elliptio) dilatata — Porto-Hannes et al. (2021)