How many different groups of reptiles are there?

How many different groups of reptiles are there?

There are four major groups of reptiles: Crocodilia, Squamata, Sphenodonita, and Testudines.

What group contains most species of reptiles?

Squamates are the most diverse of all the reptile groups, with approximately 7,400 living species. Squamates include lizards, snakes, and worm-lizards.

How are reptiles classified?

Classification of Reptiles In traditional taxonomy, reptiles were classified based on their physical features (morphology); they are ectothermic, their skin is covered in scales, and they are amniotes. Reptiles include all the amniotes except birds and mammals.

How are the four types of reptiles different?

There are four basic types of reptiles: crocodiles and alligators; turtles and tortoises; snakes; and lizards. Reptiles are characterized by their cold-blooded metabolisms—they fuel themselves by exposure to the sun—their scaly skin, and their leathery eggs, which they, unlike amphibians, can lay some distance from bodies of water.

What are reptiles and what are their relatives?

turtles, snakes, lizards, and relatives. Reptilia. Reptiles are vertebrates that have scales on at least some part of their body, leathery or hard-shelled eggs, and share a number of other features. Snakes, lizards, turtles, crocodilians, and birds are reptiles.

Which is the most popular group of reptiles?

Popular lizard groups within the Squamata order: Iguanidae (Iguanas) – Includes many subspecies: anoles, collared lizards, etc. Few animals inspire such mixed emotion as snakes. It seems people either love them or hate them. We feel that many who hate snakes simply don’t understand them. Here’s our attempt to change all of that.

Which is one of the six basic animal groups?

These characteristics are scales and amniotic eggs (eggs with an internal fluid membrane). Reptiles are one of the six basic animal groups. Other basic animal groups include amphibians, birds, fish, invertebrates, and mammals. Photo © LS Luecke / Shutterstock.

What are three living living groups of reptiles?

The major groups of living reptiles-the turtles (order Testudines), tuatara (order Rhynchocephalia [Sphenodontida]), lizards and snakes (order Squamata), and crocodiles (order Crocodylia, or Crocodilia)-account for over 8,700 species.

What are the four main groups of Reptilia?

There are four major groups of reptiles living today: turtles/tortoises, lizards/snakes, crocodilians, and dinosaurs.

What is the largest group of reptiles?

By far the largest group of reptiles are lizards and snakes, member of the order Squamata . With over 5,000 lizard species and 3,000 snakes, these groups together comprise the large majority of living reptiles.

What is the smallest order of reptiles?

Under the current system of reptile classification, there are approximately 300 species of turtle and tortoise in the Testudines order of reptiles. Sphenodontia – This is the least known and smallest order of reptiles. It is comprised of only two species of tuataras from New Zealand.