animals having a bony or cartilaginous skeleton with a segmented spinal column and a large brain enclosed in a skull or cranium

class of cold-blooded air-breathing vertebrates with completely ossified skeleton and a body usually covered with scales or horny plates; once the dominant land animals

primitive reptile having no opening in the temporal region of the skull; all extinct except turtles

reptile having a pair of openings in the skull behind each eye

used in former classifications to include all living reptiles except turtles; superseded by the two subclasses Lepidosauria and Archosauria

extinct reptile having a single pair of lateral temporal openings in the skull

class of cold-blooded air-breathing vertebrates with completely ossified skeleton and a body usually covered with scales or horny plates; once the dominant land animals