Any of a group of chiefly extinct reptiles that first emerged in the early Permian Period and are characterized by a skull with no openings in the temporal region. Modern turtles and tortoises may be surviving members of this group, or they may be descendants of diapsids that lost their skull openings.
Any of a group of amniote vertebrates that first emerged in the late Permian Period, characterized by a single opening in the temporal region on each side of the skull and including the mammals along with various extinct groups more closely related to mammals than to other amniotes.
Any of various amniote vertebrates that emerged in the Permian Period and diversified in the Triassic, including the mammals, their ancestors, and their relatives.
reptile having a pair of openings in the skull behind each eye
Find another word for diapsid. In this page you can discover 4 synonyms, antonyms, idiomatic expressions, and related words for diapsid, like: anapsid, synapsid, therapsid and diapsid reptile.