Sigmoilopsis arenata
(Cushma, 1921)
identified by scientist   
Quaternary

Sigmoilopsis arenata
(Cushman, 1921)
identified by scientist   
Quaternary
Banda, Timor and Arafura Sea

Sigmoilopsis arenata
Said, 1949
identified by M. Hesemann   
Quaternary
Hawaii

Sigmoilopsis bronniana
(d'Orbigny, 1846)
type specimen   lectotype
Neogene
Vienna Basin

Sigmoilopsis celata
(Costa, 1855)
identified by scientist   
Neogene
Pannonian Basin

Sigmoilopsis elliptica
(Galloway & Wissler, 1927)
identified by scientist   
Quaternary
Gulf of Mexico

Sigmoilopsis minuta
(Collins, 1958)
identified by scientist   
Quaternary
Banda, Timor and Arafura Sea

Sigmoilopsis minuta
(Collins, 1958)
identified by scientist   
Quaternary
Banda, Timor and Arafura Sea

Sigmoilopsis revetocollaris
Loeblich and Tappan, 1984
identified by scientist   
Quaternary
Banda, Timor and Arafura Sea

Sigmoilopsis schlumbergeri
(Silvestri, 1904)
identified by M. Hesemann   
Quaternary
off West Africa