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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).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 ...
Jun 12, 2024 · Most reptiles have a continuous external covering of epidermal scales.Reptile scales contain a unique type of keratin called beta keratin; the scales and interscalar skin also contain alpha keratin, which is a trait shared with other vertebrates.Keratin is the main component of reptilian scales. Scales may be very small, as in the microscopic tubercular scales of dwarf geckos (Sphaerodactylus), or relatively large, as in the body scales of many groups of lizards and snakes.The largest scales ...
The organisms belonging to the class Reptilia are known to be the first organisms to adapt to life on land. There are about 6000 different living species of reptiles on earth.
Mar 2, 2024 · The orders of reptiles are Squamata, Testudines, Crocodylia, and Rhynchocephalia. Reptiles are a diverse group of vertebrates that have played a pivotal role in the ecological and evolutionary history of life on Earth.
Reptiles are air-breathing vertebrates covered in special skin made up of scales, bony plates, or a combination of both. They include crocodiles, snakes, lizards, turtles, and tor- toises. All ...
May 17, 2022 · Lizards, dinosaurs, crocodiles, turtles, and snakes – all belong to that ancient and stout class of animals known as the reptiles. This is a diverse group with more than 10,000 different species and a huge representation in the fossil record. Once the dominant land vertebrates on the planet, reptiles still occupy just about every single […]
Lizards (Lacertilia) are one of the most diverse groups of reptiles, boasting over 4,675 species that inhabit various ecosystems worldwide.They range in size from tiny geckos to giant monitor lizards, which can grow up to several feet long. Lizards have a varied diet that includes insects, small animals, and plants.
reptile, Any of the approximately 8,700 species of the class Reptilia, the group of air-breathing vertebrates that have internal fertilization and a scaly body and are cold-blooded. Most species have short legs (or none) and long tails, and most lay eggs. Living reptiles include the scaly reptiles (snakes and lizards; order Squamata), the crocodiles (Crocodylia), the turtles (Testudines), and the unique tuatara (Sphenodontida).Being cold-blooded, reptiles are not found in very cold regions ...
Oct 19, 2023 · Media Credits. The audio, illustrations, photos, and videos are credited beneath the media asset, except for promotional images, which generally link to another page that contains the media credit.
Reptiles are a class of vertebrates made up mostly of snakes, turtles, lizards, and crocodilians. These animals are most easily recognized by their dry, scaly skin.
