Definition
The "order Chelonia" is a taxonomic classification that includes all turtles, tortoises, and terrapins. These reptiles are characterized by their unique bony shells, which consist of a carapace (upper shell) and a plastron (lower shell). They are an ancient group, having evolved over 200 million years ago. Chelonia members inhabit various environments, from oceans and rivers to deserts and forests. The shell is fused to their ribs and vertebrae, providing exceptional protection.