Order Testudines Wagler, 1830 - turtles Suborder Cryptodira Cope, 1868 Superfamily Testudinoidea Batsch, 1788 Family Platysternidae Gray, 1869 Genus Platysternon Gray, 1831 Platysternon megacephalum Gray, 1831 - big-headed turtle Platysternon megacephalum shiui Ernst & McCord, 1987 - Vietnamese big-headed turtle