Testudinata n. pl. (Zool.) An order of reptiles which includes the turtles and tortoises. The body is covered by a shell consisting of an upper or dorsal shell, called the carapace, and a lower or ventral shell, called the plastron, each of which consists of several plates.
... The systematics and ecology of the Sternothaerus carinatus complex (Testudinata, Chelydridae). Tulane Stud. ... — Description of a New Softshell Turtle From the Southeastern United States • Robert G. Webb