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Any of a group of amniote vertebrates that are characterized by two openings in the temporal region on each side of the skull. The first diapsids emerged in the Pennsylvanian Period, and their descendants include the lizards, snakes, crocodiles, dinosaurs, pterosaurs, birds, and, in some classifications, the turtles.
[New Latin Diapsida, taxon name : di- + Greek hapsis, hapsid-, arch (from the two temporal openings on each side of the skull ); see apsis.]
any member of the group of reptiles having two holes towards the back of each side of the skull; this group includes crocodiles and snakes
of or relating to diapsids
(of reptiles) having two openings in the skull behind each eye.
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|Noun||1.||diapsid - reptile having a pair of openings in the skull behind each eye|
reptile, reptilian - any cold-blooded vertebrate of the class Reptilia including tortoises, turtles, snakes, lizards, alligators, crocodiles, and extinct forms
Sphenodon punctatum, tuatara - only extant member of the order Rhynchocephalia of large spiny lizard-like diapsid reptiles of coastal islands off New Zealand
saurian - any of various reptiles of the suborder Sauria which includes lizards; in former classifications included also the crocodiles and dinosaurs
archosaur, archosaurian, archosaurian reptile - extinct reptiles including: dinosaurs; plesiosaurs; pterosaurs; ichthyosaurs; thecodonts