Subclass Anapsida

Order Testudines - Turtles

Suborder Cryptodira
- Family Chelydridae - Snapping Turtles
  Family Emydidae - Pond Turtles and Box Turtles
  Family Testudinidae - Tortoises
  Family Geoemydidae - Asian River Turtles and Allies
  Family Carettochelyidae - Pignose Turtles
  Family Trionychidae - Softshell Turtles
  Family Dermatemydidae - River Turtles
  Family Kinosternidae - Mud Turtles
  Family Cheloniidae - Sea Turtles
  Family Dermochelyidae - Leatherback Turtles
Suborder Pleurodira
- Family Chelidae - Austro-American Sideneck Turtles
  Family Pelomedusidae - Afro-American Sideneck Turtles
  Family Podocnemididae - Madagascan Big-headed Turtles and American Sideneck River Turtles

Subclass Lepidosauria

Order Rhynchocephalia - Tuataras

Suborder Sphenodontida
- Family Sphenodontidae

Order Squamata - Scaled reptiles

Suborder Sauria
- Family Agamidae - Agamas
- Family Chamaeleonidae - Chameleons
- Family Iguanidae
  - Subfamily Corytophaninae - Casquehead Lizard
    Subfamily Crotaphytinae - Collared and Leopard Lizards
    Subfamily Hoplocercinae - Wood lizards
    Subfamily Iguaninae - Iguanas
    Subfamily Leiocephalinae
    Subfamily Leiosaurinae
    Subfamily Liolaeminae
    Subfamily Oplurinae - Madagascar iguanids
    Subfamily Phrynosomatinae - Horned Lizards
    Subfamily Polychrotinae - Anoles
    Subfamily Tropidurinae - Neotropical Ground Lizards
- Family Gekkonidae - Geckoes
  Family Pygopodidae - Legless lizards
  Family Dibamidae - Blind Lizards
  Family Cordylidae - Spinytail Lizards
  Family Gerrhosauridae - Plated Lizards
  Family Gymnophthalmidae - Spectacled Lizards
  Family Teiidae - Whiptails and Tegus
  Family Lacertidae - Lacertids
  Family Scincidae - Skinks
  Family Xantusiidae - Night Lizards
  Family Anguidae - Glass Lizards
  Family Anniellidae - American legless lizards
  Family Xenosauridae - Knob-scaled Lizards
  Family Helodermatidae - Gila Monsters
  Family Lanthanotidae - Earless Monitor lizards
  Family Varanidae - Monitor Lizards
Suborder Amphisbaenia
- Family Amphisbaenidae - Worm Lizards
  Family Trogonophidae - Shorthead Worm Lizards
  Family Bipedidae - Two-legged Worm Lizards
Suborder Ophidia - Snakes
- Family Anomalepidae - Dawn Blind Snakes
  Family Typhlopidae - Blind Snakes
  Family Leptotyphlopidae - Slender Blind Snakes
  Family Aniliidae - Pipe Snakes
  Family Anomochilidae - Dwarf pipe snakes
  Family Boidae - Boas and Pythons
  Family Bolyeridae - Round Island Boas
  Family Cylindrophiidae - Asian pipe snakes
  Family Loxocemidae - Mexican Burrowing Pythons
  Family Tropidophiidae - Dwarf boas
  Family Uropeltidae - Shield-tail Snakes
  Family Xenopeltidae - Sunbeam Snakes
  Family Acrochordidae - File Snakes
  Family Atractaspididae - Mole Vipers
  Family Colubridae - Colubrids
  Family Elapidae - Coral Snakes and Sea Snakes
- Family Viperidae - Vipers^[1]
  - Subfamily Azemiopinae - Fea's viper
    Subfamily Causinae - Night adders
    Subfamily Crotalinae - Pit vipers
    Subfamily Viperinae - Pitless vipers