Triplasia emslandensis
Bartenstein and Brand, 1951
identified by M. Hesemann   
Cretaceous
North European Plain

Triplasia jurassica
(Myatlyuk, 1939)
type specimen   holotype
Jurassic
Eastern European Plain

Triplasia tricarinata
(Małecki, 1954)
type specimen   holotype
Jurassic
Southern Polish Basin

Triplasia variabilis
(Brady, 1884)
identified by scientist   
Quaternary
Fiji and off