vertebrates Cuvier, 1812 - vertebrates
Cohort Amniota Haeckel, 1866
see Clade Amniota Haeckel, 1866 [Gauthier, Kluge & Rowe 1988]
Class "Reptilia" Linnaeus, 1758 - reptiles
Subclass Testudines Wagler, 1830
see Class Chelonia Brongniart, 1800
Order Casichelydia Gaffney, 1975
Suborder Cryptodira Cope, 1868
Superfamily Chelonioidea Oppel, 1811
Family †Protostegidae Cope, 1873
1 Subfamily †Protosteginae Cope, 1873