Order Testudines Wagler, 1830 - turtles Suborder Pleurodira Cope, 1864 Family Chelidae Gray, 1825 Subfamily Chelinae Gray, 1825 Genus Phrynops Wagler, 1830 1 Phrynops geoffroanus (Schweigger, 1812) - Geoffroy's side-necked turtle 2 Phrynops hilarii (Duméril & Bibron, 1835) - Saint-Hilaire's side-necked turtle 3 Phrynops tuberosus (Peters, 1870) - Guianan Shield side-necked turtle 4 Phrynops williamsi Rhodin & Mittermeier, 1983 - Williams' side-necked turtle