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Reptiles are a diverse animal classification group of scaly, cold-blooded vertebrates that can be found in habitats all around the world. Crocodiles, snakes, turtles and lizards belong to the ...
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The biological traits listed by Lydekker in 1896, for example, include a single occipital condyle, a jaw joint formed by the quadrate and articular bones, and certain characteristics of the vertebrae. [15] The animals singled out by these formulations, the amniotes other than the mammals and the birds, are still those considered reptiles today ...
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 .
Eureptilia ("true reptiles") is one of the two major subgroups of the clade Sauropsida, the other one being Parareptilia. Eureptilia includes Diapsida (the clade containing all modern reptiles and birds ), as well as a number of primitive Permo - Carboniferous forms previously classified under Anapsida , in the old (no longer recognised) order ...
Marine reptiles are reptiles which have become secondarily adapted for an aquatic or semiaquatic life in a marine environment. Only about 100 of the 12,000 extant reptile species and subspecies are classed as marine reptiles, including marine iguanas , sea snakes , sea turtles and saltwater crocodiles .
Sauria was historically used as a partial equivalent for Squamata (which contains lizards and snakes). [5] The redefinition to cover the last common ancestor of archosaurs and lepidosaurs was the result of papers by Jacques A. Gauthier and colleagues in the 1980s.
The major reptile group Diapsida, for example, is defined by the presence of two temporal fenestrae on each side of the skull. The infratemporal fenestra , also called the lateral temporal fenestra or lower temporal fenestra , is the lower of the two and is exposed primarily in lateral (side) view.