Unio euphraticus Bourguignat, 1852
Bourguignat, 1852, Test. Nov. Saulcy: 28.
Bourguignat, 1853, Catalogue Raissoné des Mollusques Terrestres et Fluviatiles Recueillis par M.F. Saulcy 1853: 75, pl. 4, figs. 1-3.
Bourguignat, 1856, Rev. Mag. Zool. 8: 72.
Type(s): HOLOTYPE MNHN_MP_0037, Bagdad.

Unio euphraticus — Bourguignat (1852), Bourguignat (1853)
Pseudodon euphratica — Conrad (1865)
Margaron (Monocondylœa) rhomboidea — Lea (1870)
Margaritana euphratica — Kobelt (1886)
Leguminaia euphraticus — Westerlund (1890)
Pseudodon euphraticus — Servain (1890)
Gabillotia euphratica — Simpson (1900), Simpson (1914)
Pseudodontopsis euphratica — Kobelt (1912), Graf (2007), Graf & Cummings (2007), Graf & Cummings (2021), Lopes-Lima et al. (2021), Bogan et al. (2021)
Gabilliotia euphratica — Preston (1912)
Pseudodontopsis euphraticus — Haas (1940), Haas (1952), Haas (1969), Schütt (1983), Falkner (1994), Bogan (2010)
Leguminaia (Pseudodontopsis) euphratica — Haas (1969)

Unio opperti Bourguignat, 1856
Bourguignat, 1856, Rev. Mag. Zool. 8: 71, pl. 8, fig. 6; pl. 9, fig. 1.

Unio opperti — Bourguignat (1856)
Margaron (Monocondylœa) rhomboidea — Lea (1870)
Pseudodon opperti — Bourguignat (1880), Westerlund (1890), Servain (1890), Kobelt (1904)
Gabillotia opperti — Simpson (1900), Simpson (1914)
Pseudodontopsis opperti — Kobelt (1912)
Pseudodontopsis euphraticus — Haas (1940), Haas (1969)
Pseudodontopsis euphratica — Lopes-Lima et al. (2021)

Unio churchillianus Bourguignat, 1857
Bourguignat, 1857, Rev. Mag. Zool. 9: 18, pl. 2, figs. 1-4.

Unio churchillianus — Bourguignat (1857)
Unio churchilleanus — Sowerby (1868)
Margaron (Monocondylœa) rhomboidea — Lea (1870)
Pseudodon churchillianus — Bourguignat (1880), Westerlund (1890), Servain (1890)
Gabillotia euphratica var. churchillianus — Simpson (1900)
Pseudodontopsis churchilliana — Kobelt (1912)
Gabillotia euphratica var. churchilliana — Simpson (1914)
Pseudodontopsis euphraticus — Haas (1940), Haas (1969)
Pseudodontopsis euphratica — Lopes-Lima et al. (2021)

Monocondyloea rhomboidea Lea, 1859
Lea, 1859, Proc. Acad. Nat. Sci. 11: 187 [as ‘Monocondylœa rhomboidea’].
Lea, 1860, Jour. Acad. Nat. Sci. 4 [O. 7]: 263 [81], pl. 42, fig. 143.
Type(s): SYNTYPES USNM_86329, Tigris R., near Bagdad, Asia.

Monocondyloea rhomboidea — Lea (1859)
Monocondylaea rhomboidea — Küster (1862)
Monocondylea rhomboidea — Petit de la Saussaye (1865)
Unio rhomboideus — Sowerby (1868)
Margaron (Monocondylœa) rhomboidea — Lea (1870)
Pseudodon rhomboideus — Bourguignat (1880), Westerlund (1890), Servain (1890)
Leguminaia rhomboidea — Kobelt (1893)
Gabillotia euphratica var. churchillianus — Simpson (1900)
Gabillotia euphratica var. churchilliana — Simpson (1914)
Pseudodontopsis euphraticus — Haas (1940), Haas (1969)
Pseudodontopsis euphratica — Lopes-Lima et al. (2021)

Unio churchilleanus Sowerby, 1868
‘Bourguignat’ Sowerby, 1868, Conch. Icon. 16: pl. 96, sp. 525.
(error for Unio churchillianus Bourguignat, 1857)

Unio churchilleanus — Sowerby (1868)
Gabillotia euphratica — Simpson (1900), Simpson (1914)
Gabilliotia euphratica — Preston (1912)

Pseudodon pachyolenus Bourguignat, 1880
Bourguignat, 1880, Mater. Moll. Acécphales Syst. Europ. 1: 4. [nomen nudum]
Servain, 1890, Bull. Soc. Malac. France 7: 296. [nomen nudum]

Pseudodon pachyolenus — Bourguignat (1880), Servain (1890)
Pseudodontopsis babylonica — Kobelt (1912)
Pseudodontopsis euphraticus — Haas (1940)
Pseudodontopsis euphratica — Lopes-Lima et al. (2021)

Margaritana euphratica Kobelt, 1886
‘Bourguignat’ Kobelt, 1886, Icon. Land- und Süssw.-Moll. 2: 26, pl. 45, fig. 266.
(reference to Unio euphraticus Bourguignat, 1852)

Margaritana euphratica — Kobelt (1886)
Gabillotia opperti — Simpson (1900)
Pseudodontopsis babylonica — Kobelt (1912)
Gabilliotia euphratica — Preston (1912)
Gabillotia euphratica — Simpson (1914)

Pseudodontopsis babylonica Kobelt, 1912
Bourguignat, 1880, Mater. Moll. Acécphales Syst. Europ. 1: 4 [as ‘Pseudodon babylonicus’]. [nomen nudum]
‘Bourguignat’ Kobelt, 1912, Icon. Land- und Süssw.-Moll. 19: 4, pl. 512, figs. 2688-2689.

Pseudodontopsis babylonica — Kobelt (1912)
Pseudodon babylonicus — Bourguignat (1880), Servain (1890)
Gabillotia euphratica — Simpson (1914)
Pseudodontopsis babylonicus — Pallary (1939)
Pseudodontopsis euphraticus — Haas (1940), Haas (1969)
Pseudodontopsis euphratica — Lopes-Lima et al. (2021)

Pseudodontopsis piestius Kobelt, 1912
Bourguignat, 1880, Mater. Moll. Acécphales Syst. Europ. 1: 4 [as ‘Pseudodon piestius’]. [nomen nudum]
‘Bourguignat mss’ Kobelt, 1912, Icon. Land- und Süssw.-Moll. 19: 5, pl. 513, figs. 2690-2691.

Pseudodontopsis piestius — Kobelt (1912), Pallary (1939)
Pseudodon piestius — Bourguignat (1880), Servain (1890)
Gabillotia euphratica — Simpson (1914)
Pseudodontopsis euphraticus — Haas (1940), Haas (1969)
Pseudodontopsis euphratica — Lopes-Lima et al. (2021)

Taxonomic History (since 1900)

Gabillotia euphratica — Simpson (1900), Simpson (1914)
Gabillotia opperti — Simpson (1900), Simpson (1914)
Gabillotia euphratica var. churchillianus — Simpson (1900)
Pseudodon opperti — Kobelt (1904)
Pseudodontopsis euphratica — Kobelt (1912), Graf (2007), Graf & Cummings (2007), Graf & Cummings (2021), Lopes-Lima et al. (2021), Bogan et al. (2021)
Gabilliotia euphratica — Preston (1912)
Pseudodontopsis opperti — Kobelt (1912)
Pseudodontopsis churchilliana — Kobelt (1912)
Pseudodontopsis babylonica — Kobelt (1912)
Pseudodontopsis piestius — Kobelt (1912), Pallary (1939)
Gabillotia euphratica var. churchilliana — Simpson (1914)
Pseudodontopsis babylonicus — Pallary (1939)
Pseudodontopsis euphraticus — Haas (1940), Haas (1952), Haas (1969), Schütt (1983), Falkner (1994), Bogan (2010)
Leguminaia (Pseudodontopsis) euphratica — Haas (1969)