Phylum Chordata Bateson, 1885 - chordates Subphylum Vertebrata Cuvier, 1812 - vertebrates Class Reptilia Linnaeus, 1758 - reptiles Subclass Anapsida Osborn, 1903 - anapsids Order Testudines Wagler, 1830 - turtles Suborder Cryptodira Cope, 1868 Family Dermatemydidae Gray, 1870 - Mesoamerican river turtles