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==Families==
===Agamidae===
* Family of lizards of the old world
* Acrodont dentition
* Includes the agama (Agama agama), frilled lizard (Chamydosaurus kingii), water dragon (Psysignathus cocincinus), Egyptian spiny-tailed lizard (Uromastyx aegyptius) and the sail-fin lizard (Hydrosaurus pustulatus)
===Iguanidae===
* Family of lizards in the new world and a few species in the Indian Ocean region
* Pleurodont dentition
* Includes the green iguana (Iguana iguana), the green anole (Anolis carolinensis), basilisks (Basiliscus spp.), horned lizards (Phrynosoma spp.) spiny lizards (Sceloporus spp.) and West Indian rock iguanas (Cyclura spp.)
===Chamaeleontidae===
* Old world or true chameleons
* Anatomical differences from other lizards may include astonishingly long tongues, ability for colour change, oppositely opposable digits and prehensile tails.
* Generally viviparous
===Gekkonidae===
* Geckos
* Large and diverse family which have colonised all tropical areas and extended into temperature regions
* Primarily nocturnal insectivores
* Anatomical differences from other lizards may include toe-pads, eyelids that have fused and are transparent as in snakes and eyes that move independently and are usually large
* When subjected to daylight the pupils contract to a narrow slit with a series of pinholes
* Generally oviparous with one to two eggs laid but some are viviparous
* Three subfamilies are Eublepharine (no toe-pads), Sphaerodactylinae and Gekkoninae
* Includes the commonly kept leopard gecko (Eublepharis macularius)
===Pygopodidae===
* Includes snake lizards (Lialis spp.) and the scalyfoot (Pygopus spp.) which are without forelimbs and their hindlimbs are reduced to flaps of skin
===Lacertidae===
* Wall or sand lizards of the old world
* Insectivorous
* All oviparous except the viviparous lizard (Lacerta vivapara)
* Includes the oscellated green lizard (Lacerta lepida), rock lizard (Lacerta saxicola)
===Teiidae===
* New world equivalents of the Lacertidae
* The smaller are insectivorous and the larger carnivorous
* Includes the whiptails and racerunners (Cnemidophorus spp.), jungle runners (Ameiva spp.) and tegus (Tupinambis spp.)
===Xantusiidae===
* Desert night lizards
* Xantusia spp.
===Scincidae===
* True skinks
* Little sexual dimorphism
* Includes the blue-tongued skink (Tiliqua spp.), prehensile-tailed skink (Corucia zebrata), five-lined skink (Eumeces fasciatus) and the casqueheads (Tribolonotus spp.)
===Cordylidae===
* Zonures or girdle-tailed lizards
* All require very hot, dry conditions
* Includes Cordylus spp.
===Dibamidae===
* Blind lizards
* Dibamus and Anelytropsis spp.
===Xenosauridae===
* Consists of the Chinese crocodile-tailed lizard (Shinisaurus crocodiluris) and the new world xenosaurs (Xenosaurus spp.)
===Anguidae===
* Long and snake-like in form
* In America, Asia, Africa and Europe but species are not numerous
* Both oviparous and viviparous species, both diurnal and nocturnal species and generally terrestrial
* Insectivorous or carnivorous
* Includes slow-worm (Anguis fragilis), alligator lizards (Elgaria spp.), glass lizards (Ophisaurus spp.) legless lizards (Annelia spp.) and the sheltopusik (Ophisaurus apodus)
===Helodermatidae===
* Two species that are the only venomous lizards
* Gila monster (Heloderma suspectum) and the Mexican beaded lizard (Heloderma horridum)
===Varanidae===
* Monitor lizards
* Mostly large powerful predators or carrion eaters
* Includes the savannah monitor (Varanus exanthematicus), Nile monitor (Varanus niloticus) and the Komodo dragon (Varanus komodoensis)
===Lanthanotidae===
* Monotypic family
* The Bornean earless lizard (Lanthanotus borneensis)
[[Category:Lizard_Taxonomy]]
[[Category:Lizard_Taxonomy]]