Reptiles first appear in the fossil record 315 million years ago and were the dominant animals during the Mesozoic era, which lasted for 270 million years until the extinction of the dinosaurs.

Reptile skin In reptiles, the epidermis forms a complete body covering of keratinized scales. Epidermis consists of stratum germinativum and outer stratum corneum Five layers, from outside in: First, ...

Reptile skin In reptiles, the epidermis forms a complete body covering of keratinized scales. Epidermis consists of stratum germinativum and outer stratum corneum Five layers, from outside in: First, ...