diapsid

[dahy-ap-sid]
adjective
1.
(of reptiles) having two openings in the skull behind each eye, characteristic of the subclasses Lepidosauria and Archosauria, including all living reptiles except turtles.
noun
2.
a diapsid reptile.
Compare anapsid.


Origin:
< Neo-Latin Diapsida (1903); see di-1, anapsid

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American Heritage
Science Dictionary
diapsid  [%PREMIUM_LINK%]     (dī-āp'sĭd)  Pronunciation Key 
Any of various reptiles having a skull with two pairs of temporal openings. Diapsids evolved in the Permian Period and grew longer and better-developed hindlimbs than forelimbs (unlike therapsids). Diapsids evolved into the archosaurs (including the dinosaurs and their descendants the birds) and all modern reptiles except turtles. Compare anapsid, synapsid, therapsid.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
However, there are two other possibilities that would bring turtles into the diapsid fold.
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