Order Testudines Wagler, 1830 - turtles Suborder Pleurodira Cope, 1864 Family Podocnemididae Cope, 1868 - Madagascan big-headed turtles and American sideneck river turtles Genus Podocnemis Wagler, 1830 Podocnemis expansa (Schweigger, 1812) - giant South American river turtle