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Reptiles, as commonly defined, are a group of tetrapods with an ectothermic ('cold-blooded') metabolism and amniotic development.Living reptiles comprise four orders: Testudines (), Crocodilia (crocodilians), Squamata (lizards and snakes), and Rhynchocephalia (the tuatara).
Living reptiles comprise four orders: Testudines , Crocodilia (crocodilians), Squamata (lizards and snakes), and Rhynchocephalia (the tuatara). As of May 2023, about 12,000 living species of reptiles are listed in the Reptile Database.
Squamata is the largest order of reptiles, comprising lizards, snakes and amphisbaenians (worm lizards), which are collectively known as squamates or scaled reptiles. With over 10,000 species, [15] Approximate world distribution of snakes. Suborder Anguimorpha. Family Anguidae [16] Genus Abronia; Genus Anguis; Genus Dopasia; Genus Elgaria ...
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Reptiles are tetrapod animals in the class Reptilia, comprising today's turtles, crocodilians, snakes, amphisbaenians, lizards, tuatara, and their extinct relatives. The study of these traditional reptile orders , historically combined with that of modern amphibians , is called herpetology .
While reptiles and amphibians can be quite similar externally, the French zoologist Pierre André Latreille recognized the large physiological differences at the beginning of the 19th century and split the herptiles into two classes, giving the four familiar classes of tetrapods: amphibians, reptiles, birds and mammals.
As of May 2023, about 12,000 living species of reptiles are listed in the Reptile Database. The study of the traditional reptile orders, customarily in combination with the study of modern amphibians, is called herpetology. Reptiles have been subject to several conflicting taxonomic definitions.
He records that the legs are thick, with short digits joined for most of their length, five toenails on the forelegs, four on the hind legs. Then (on the ninth page) he arrives at the first species in the volume, the Greek tortoise, Testudo graeca. It is summed up in a paragraph, Cuvier noting that it is the commonest tortoise in Europe, living ...