Question

Which of the following animals belongs to the order Chelonia of class Reptilia?
A. Chelone
B. Trionyx
C. Testudo
D. All of the above

Answer 1

Hint: Class Reptilia include animals that are cold-blooded, four-footed (tetrapods), and have dry and rough skin. This class has been divided into four living orders- Chelonia, Crocodilia, Rhynchocephalia, and Squamata. The order Chelonia of class Reptilia consists of turtles, terrapins, and tortoises.

Complete step by step answer:
Option (A) is correct. Chelone is the genus of turtles belonging to the family Cheloniidae in the order Chelonia of class Reptilia. It is characterized by the presence of hard shells with a bony top shell and bottom shell with epidermal scales.

Chelone.

Option (B) is correct. Trionyx is the genus of softshell turtles that belong to the family Trionychidae in the order Chelonia of class Reptilia. It is characterized by the presence of softshells that lack horny scales.

Trionyx.

Option (C) is correct. Testudo is the genus of tortoises, the Mediterranean tortoises belonging to the family Testudinidae in the order Chelonia of class Reptilia. A bony or cartilaginous shell formed from their ribs, serving as a shield, characterizes it.

Testudo.

Option (D) is correct. Since all of the three options i.e., Chelone, Trionyx, and Testudo belong to the order Chelonia of class Reptilia, therefore all these options are correct.
Hence, the correct option is (D).

Note:
Order Chelonia under the class Reptilia includes those animals in which most of the body is covered or enclosed within a protective bony capsule. Hence, Chelone, Trionyx, and Testudo are turtles and tortoises that have a protective shell outside their body that provides protection. Thus, these three organisms come under the order Chelonia of class Reptilia.