Cyclas bahiensis Wagner, 1827
Spix in Wagner, 1827. Test. Fluv. Brasil.: ??.

Eupera bahiensis — H.B. Baker (1930), Mansur & Meier-Brook (2000), Simone (2006), Lasso et al. (2009), Bogan (2010), Pereira et al. (2014), Ituarte (2020)

Cyclas maculata Anton, 1837
Anton, 1837. Arch. Naturg. 3 (1): 284.
(homonym of Cyclas maculata Morelet, 1851)

Eupera maculata — Mansur & Meier-Brook (2000)

Cyclas (Pisidium) diaphanum Haldeman, 1841
Haldeman, 1841. Proc. Acad. Nat. Sci. 1: 53.

Eupera moquiniana — H.B. Baker (1930)
Eupera diaphana — Mansur & Meier-Brook (2000)
Eupera modioliforme — Simone (2006)

Pisidium moquinianum Bourguignat, 1854
Bourguignat, 1854. Rev. Mag. Zool. 6: 663, pl. 14, figs. 13-17.

Sphærium (Eupera) moquinianum — Dall (1903)
Eupera moquiniana — H.B. Baker (1930), Bogan (2010), IUCN (2011)
— Daget (1998)
Eupera bahiensis — Mansur & Meier-Brook (2000)
Eupera modioliforme — Simone (2006)

Cyclas littoralis Prime, 1865
‘Férussac, Collect. Michaud’ Prime, 1865. Smithsonian Misc. Coll. (145): 54. [nomen nudum]
‘Férussac, in litt.’ Prime, 1870. Amer. J. Conch. 5: 155. [nomen nudum]
(intro'd as syn of Cyclas modioliformis Anton, 1837)

Eupera moquiniana — H.B. Baker (1930)
Eupera modioliforme — Simone (2006)

Cyclas striatella Prime, 1865
‘Férussac, Museum of Paris’ Prime, 1865. Smithsonian Misc. Coll. (145): 54. [nomen nudum]
‘Férussac, in litt.’ Prime, 1870. Amer. J. Conch. 5: 155. [nomen nudum]
(intro'd as syn of Cyclas modioliformis Anton, 1837)

Eupera moquiniana — H.B. Baker (1930)
Eupera modioliforme — Simone (2006)

Cyclas venezuelensis Prime, 1865
Prime, 1865. Smithsonian Misc. Coll. (145): 54. [nomen nudum]
Prime, 1870. Amer. J. Conch. 5: 155. [nomen nudum]
(intro'd as syn of Cyclas modioliformis Anton, 1837)

Eupera moquiniana — H.B. Baker (1930)
Eupera modioliforme — Simone (2006)