There are five infraorders which separate the lizards, these are: Diploglossa, Gekkota, Iguania, Platynota and Scincomorpha. This separation is based mainly on morphological similarities between family groups. The Diploglossans and Platynotans are two closely related infraorders which are very diverse families. Very few generalisations can be placed upon these families morphologically. Many species are limbless, while others have fully formed limbs. It is believed that these lizards are the closest lizard relation to the snakes. The Gekkotans are the second most diverse group of lizards. They can be morphologically distinguished by the absence of temporal arches, which allows greater moveability of the head. Most species also have cloacal sacs and fixed eyelids. The Iguanians are another diverse group of lizards. All iguanians are fully limbed. Most species ambush their prey, capture it with their tongue and have skin modification, such as crests and fans, used for many different reasons. The Scincomorphs are the most diverse group of lizards, accounting for almost half the species of lizards. The major distinguishing morphological feature of the Scincomorphs, is the presence of unsocketed teeth on the inner face of the jaw bones. They also lack the skin modifications present in many of the iguanians. This family contains varying degrees of limb reduction, from completely formed limbs to completely absent of limbs. As with most taxonomic classifications, there are many different interpretations of the evolutionary relationships. These include moving of families to different infraorders, merging or splitting of the infraorders and merging and splitting of the families. DiploglossaFamilyCommon NamesExample SpeciesExample PhotoAnguidaeOppel, 1811Glass lizardsSlowworm (Anguis fragilis)AnniellidaeGray, 1852American legless lizardsCalifornia legless lizard (Anniella pulchra)XenosauridaeCope, 1866Knob scaled lizardsChinese crocodile lizard (Shinisaurus crocodilurus)GekkotaFamilyCommon NamesExample SpeciesExample PhotoDibamidaeBoulenger, 1884Blind lizardsDibamus nicobaricum GekkonidaeGray, 1825GeckosThick tailed Gecko (Underwoodisaurus milii)PygopodidaeBoulenger, 1884Legless lizardsBurton's legless lizard (Lialis burtonis) IguaniaFamilyCommon NamesExample SpeciesExample PhotoAgamidaeSpix, 1825Agamas Eastern bearded dragon (Pogona barbata)ChamaeleonidaeGray, 1825ChameleonsVeiled chameleon (Chamaeleo calyptratus)CorytophanidaeFrost & Etheridge, 1989Casquehead lizardsPlumed basilisk (Basiliscus plumifrons) CrotaphytidaeFrost & Etheridge, 1989Collared and leopard lizardsCommon collared lizard (Crotaphytus collaris)HoplocercidaeFrost & Etheridge, 1989Wood lizards or clubtailsClub tail iguana (Hoplocercus spinosus) IguanidaeIguanasMarine iguana (Amblyrhynchus cristatus)LeiosauridaeFrost et al., 2001 Darwin's iguana (Diplolaemus darwinii) OpluridaeFrost & Etheridge, 1989Madagascan iguanas Chalarodon (Chalarodon madagascariensis) PhrynosomatidaeFrost & Etheridge, 1989Earless, spiny, tree, side blotched and horned lizardsGreater earless lizard (Cophosaurus texanus)PolychrotidaeFrost & Etheridge, 1989AnolesCaronlina anole (Anolis carolinensis) TropiduridaeFrost & Etheridge, 1989Neotropical ground lizards(Microlophus peruvianus)PlatynotaFamilyCommon NamesExample SpeciesExample PhotoHelodermatidaeGila monstersGila Monster (Heloderma suspectum)LanthanotidaeEarless MonitorEarless Monitor (Lanthanotus borneensis) VaranidaeMonitors lizardsPerentie (Varanus giganteus)ScincomorphaFamilyCommon NamesExample SpeciesExample PhotoCordylidaeSpinytail lizards Girdle tailed lizard (Cordylus warreni) GerrhosauridaePlated lizardsSudan Plated Lizard (Gerrhosaurus major)GymnophthalmidaeSpectacled lizards LacertidaeOppel, 1811Wall or true lizardsOcellated Lizard (Lacerta lepida)ScincidaeOppel, 1811SkinksWestern Blue tongued Skink (Tiliqua occipitalis) TeiidaeTegus or whiptailsBlue Tegu (Tupinambis teguixin)XantusiidaeNight lizardsGranite Night Lizard (Xantusia henshawi)