anapsid

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Related to Anapsids: diapsid
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Synonyms for anapsid

primitive reptile having no opening in the temporal region of the skull

References in periodicals archive ?
All reptiles living today are diapsid, with the exception of turtles, previously thought to be anapsid, making them the only living primitive reptiles.
When all of the data -- much of it provided by deBraga, whose research focuses on Paleozoic reptiles -- was crunched through the computer, "we found that turtles flipped from anapsid to diapsid," Rieppel explains.
According to the standard evolutionary story, turtles retain some characteristics of the ancient anapsids.