REPTILES

Reptiles are a group of vertebrate animals are cold-blooded and have scales covering its body. Reptiles are tetrapods (four-legged animals) and spawn eggs embryo covered by amniotic membrane, breathe with lungs - lungs, heart bears 3 or 4, using energy environment to regulate their body temperature so that the animals belonging exothermic, and internal fertilization. Today they can be found on every continent except Antarctica. Formerly classified as amphibious reptiles, but not until the beginning of the 19th century it became clear that reptiles and amphibians are actually very different animals, and Pierre André Latreille (1825) tetrapod split into four classes, viz. Reptiles, amphibians, birds and mamalia.Pada mid-20th century, it has become common to divide reptiles into four groups (orders) is not based on their skulls.• Order Crocodilia (crocodiles, garhial, caimans, and alligators): 23 species• Order Sphenodontia (tuatara New Zealand): 2 species• Order Squamata (lizards, snakes and amphisbaenia ("worm-lizards")): approximately 9150 species• Order Testudinata (tortoises, turtles and terrapin): approximately 300 speciesThe majority of reptiles are ovipar (laying) although certain species Squamata are viviparous (give birth). Viviparous reptiles feed their fetuses using a type similar to placental mammals.Reptiles originated around 320-310 million years ago during the Carboniferous period, having evolved from reptiles such advanced amphibious become increasingly adapted to life on dry land. There is a group of extinct, including the dinosaurs, pterosaurs, and the water like ichthyosaurs.
Reptiles are tetrapods, vertebrates, both of which have four limbs or like a snake, which is derived from four-legged ancestors. Unlike amphibians, reptiles do not have a larval stage of water. Traditionally, the reptile was one of the three classes of amniotes, the other mammals and birds. Size reptiles varies, from measuring up to 1.6 cm in size up to 6 m and weigh up to 1 ton. Branch of science that studies reptiles is herpetology.