Triplasia georgsdorfensis
(Bartenstein & Brand, 1949)
identified by M. Hesemann   
Cretaceous
North European Plain

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

Triplasia rugosissima
(Alexander & Smith, 1932)
identified by C. Brizio   
Cretaceous
American South

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

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