What types of turtles are there?

* Genus †Australochelys (Chelonia incertae sedis) * Genus †Murrhardtia (Chelonia incertae sedis) * Genus †Palaeochersis (Chelonia incertae sedis) * Genus †Chinlechelys (Proganochelydia or basal Testudines) * Genus †Chelycarapookus (Testudines incertae sedis) * Genus †Chitracephalus (Testudines incertae sedis) * Genus †Neusticemys (Testudines incertae sedis) * Genus †Scutemys (Testudines incertae sedis) * Genus †Odontochelys (tentatively placed here) * Genus †Proganochelys Fossil of Proganochelys quenstedti, one of the oldest true turtles presently known.

Unlike modern Testudines, Proganochelys was not able to hide its head under the shell.

Basal genera * Genus †Kayentachelys * Genus †Indochelys Infraorder †Paracryptodira * Basal and incertae sedis ** Family †Kallokibotiidae ** Family †Mongolochelyidae ** Family †Pleurosternidae ** Family †Solemydidae * Superfamily †Baenoidea ** Family †Baenidae ** Family †Macrobaenidae ** Family †Neurankylidae Infraorder Eucryptodira * Basal and incertae sedis ** †"Sinemys" wuerhoensis ** Genus †Chubutemys (Meiolaniidae?) ** Genus †Hangaiemys (Macrobaenidae?) ** Genus †Judithemys ** Genus †Osteopygis ** Genus †Planetochelys ** Family Chelydridae (snapping turtles) ** Family †Eurysternidae ** Family †Macrobaenidae ** Family †Meiolaniidae (horned turtles) ** Family †Plesiochelyidae ** Family †Sinemydidae ** Family †Xinjiangchelyidae * Superfamily Chelonioidea (sea turtles) ** Family †Protostegidae ** Family †Thalassemyidae ** Family †Toxochelyidae The Western Hermann's Tortoise (Testudo hermanni hermanni) is a cryptodire.

Cryptodires hide their head inwards.

** Family Cheloniidae (green sea turtles and relatives) ** Family Dermochelyidae (leatherback turtles) * Superfamily Testudinoidea ** Family †Haichemydidae ** Family †Lindholmemydidae ** Family †Sinochelyidae ** Family Platysternidae (big-headed turtle) ** Family Emydidae (pond, box and water turtles) ** Family Geoemydidae (Asian river turtles, Asian leaf turtles, Asian box turtles and roofed turtles) ** Family Testudinidae (tortoises) * Superfamily Trionychoidea ** Family †Adocidae ** Family Carettochelyidae (pignose turtles) ** Family Dermatemydidae (river turtles) ** Family Kinosternidae (mud turtles) The African Helmeted Turtle (Pelomedusa subrufa) is a pleurodire.

Pleurodires hide their head sideways.

* ** Family Trionychidae (softshell turtles) * Basal and incertae sedis ** Family †Araripemydidae ** Family †Proterochersidae ** Family Chelidae (Austro-American sideneck turtles) * Superfamily Pelomedusoidea ** Family †Bothremydidae ** Family Pelomedusidae (African sideneck turtles) ** Family Podocnemididae (Madagascan big-headed and American sideneck river turtles)