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Reptiles (Reptilia)
Species considered: 
Critically Endangered
Worm Lizards (Amphisbaenia)
Family Amphisbaenidae (Typical Worm Lizards)
 | Genus Cynisca (West African Round-headed Worm Lizards) |
Crocodilians (Crocodylia)
Family Alligatoridae (Alligators and Caimans)
Family Crocodylidae (Crocodiles)
 | Genus Mecistops (African Slender-snouted Crocodiles) |
Family Gavialidae (Gharials)
Lizards (Sauria)
Family Agamidae (Agamas and Dragons)
 | Genus Calotes (South Asian Forest Agamas) |
 | Genus Sarada (Greater Fan-throated Agamas) |
 | Genus Sitana (Lesser Fan-throated Agamas) |
Family Alopoglossidae (Fold-tongued Spectacled Tejus)
Family Anguidae (Slowworms, etc.)
 | Genus Abronia (Arboreal Alligator Lizards) |
 | Genus Caribicus (Northern Hispaniola Forest Lizards) |
Family Anolidae (Anoles)
 | Genus Norops (Brilliant Anoles) |
Family Carphodactylidae (Southern Padless Geckos)
 | Genus Phyllurus (Australian Broad-tailed Geckos) |
Family Chamaeleonidae (Chameleons)
 | Genus Brookesia (Short-nosed Stub-tailed Chameleons) |
 | Genus Calumma (Madagascar Chameleons) |
 | Genus Kinyongia (East African Dwarf Chameleons) |
Family Dibamidae (Blind Skinks)
 | Genus Dibamus (Oriental Blind Skinks) |
Family Diplodactylidae (Double-toed Geckos)
 | Genus Bavayia (New Caledonian Brown Geckos) |
 | Genus Correlophus (New Caledonian Crested Giant Geckos) |
 | Genus Oedura (Common Australian Velvet Geckos) |
Family Eublepharidae (Eyelid Geckos)
Family Gekkonidae (Typical Geckos)
 | Genus Cnemaspis (Asian Rock and Forest Geckos) |
 | Genus Dixonius (Southeast Asian Leaf-toed Geckos) |
 | Genus Paroedura (Madagascar Leaf-toed Geckos) |
Family Gymnophthalmidae (Scaly-tongued Spectacled Tejus)
 | Genus Oreosaurus (Northern Highland Spectacled Tejus) |
Family Iguanidae (Greater Iguanas)
 | Genus Cyclura (Caribbean Ground Iguanas) |
Family Lacertidae (Typical Lizards)
 | Genus Eremias (Desert and Steppe Runners) |
Family Leiocephalidae (Curly-tailed Lizards)
Family Leiosauridae (Smooth Iguanas)
Family Liolaemidae (South American Lesser Iguanas)
Family Phrynosomatidae (North American Lesser Iguanas)
Family Phyllodactylidae (Leaf-toed Geckos)
 | Genus Asaccus (Middle East Leaf-toed Geckos) |
Family Scincidae (Skinks)
 | Genus Alinea (Caribbean Stripeless Skinks) |
 | Genus Ctenotus (Australian Comb-eared Skinks) |
 | Genus Flexiseps (Madagascar Cylindrical Skinks) |
 | Genus Larutia (Malay Slender Forest Skinks) |
 | Genus Mabuya (Antillean Two-lined Skinks) |
 | Genus Nessia (Singalese Skinks) |
 | Genus Panopa (Venezuelan Blue-tailed Skinks) |
 | Genus Scincella (South Asian and American Ground Skinks) |
 | Genus Trachylepis (African-American Grass and Forest Skinks) |
Family Sphaerodactylidae (Least Geckos, etc.)
Family Teiidae (Greater Tejus)
Family Tropiduridae (Rough-tailed Iguanas)
Family Varanidae (Monitor Lizards)
Snakes (Serpentes)
Family Boidae (Typical Boas)
Family Colubridae (Typical Snakes)
 | Genus Alsophis (Eastern Caribbean Racers) |
 | Genus Cubophis (Western Caribbean Racers) |
 | Genus Enulius (Middle American Long-tailed Snakes) |
 | Genus Geophis (Central American Earth Snakes) |
 | Genus Lycodon (Oriental Wolf Snakes) |
 | Genus Masticophis (North American Whip Snakes and Coachwhips) |
 | Genus Myersinia (Venezuelan Leaf-litter Snake) |
 | Genus Omoadiphas (Honduran Mountain Forest Snakes) |
 | Genus Sibon (Neotropical Snail Eaters) |
 | Genus Tantilla (American Centipede Snakes) |
Family Cylindrophiidae (Asian Pipe Snakes)
Family Elapidae_1 (Cobras, Mambas, etc.)
Family Gerrhopilidae (Indo-Malayan Blind Snakes)
Family Lamprophiidae (House Snakes, etc.)
Family Leptotyphlopidae (Thread Snakes)
 | Genus Mitophis (Hispaniola Thread Snakes) |
Family Tropidophiidae (Dwarf Boas)
Family Typhlopidae (Typical Blind Snakes)
 | Genus Anilios (Australian Blind Snakes) |
 | Genus Typhlops (Afro-Caribbean Blind Snakes) |
Family Uropeltidae (Shield-tailed Snakes)
Family Viperidae (Vipers)
 | Genus Atheris (African Bush Vipers) |
 | Genus Vipera (Typical Vipers or Adders) |
Family Xenotyphlopidae (Round-nosed Blind Snakes)
Turtles (Testudines)
Family Chelidae (Austro-American Side-necked Turtles)
 | Genus Chelodina (Indo-Australian Snake-necked or Long-necked Turtles) |
Family Cheloniidae (Hard-shelled Sea Turtles)
Family Dermatemydidae (Central American River Turtle)
Family Emydidae (Western Pond Turtles)
 | Genus Glyptemys (North American Wood Turtle and Bog Turtle) |
Family Geoemydidae (Eastern Pond Turtles)
 | Genus Cuora (Asian Box Turtles) |
 | Genus Orlitia (Malaysian Giant Turtle) |
 | Genus Sacalia (Eastern Eyed Turtles) |
Family Kinosternidae (American Mud and Musk Turtles)
Family Platysternidae (Big-headed Turtle)
Family Podocnemididae (Giant Side-necked Turtles)
 | Genus | |