Definition
The "order Testudines" is a taxonomic classification that encompasses all turtles, tortoises, and terrapins, distinguished by their bony shell. This shell, composed of a carapace and plastron, is fused to their ribs and vertebrae. Turtles are an ancient group, with a fossil record spanning over 200 million years. They inhabit a wide range of environments, from aquatic to terrestrial. The study of order Testudines provides insight into evolutionary adaptations.