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diapsid

[dahy-ap-sid] /daɪˈæp sɪd/
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
< New Latin Diapsida (1903); see di-1, anapsid
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for diapsid
  • However, there are two other possibilities that would bring turtles into the diapsid fold.
diapsid in Science
diapsid
  (dī-āp'sĭd)   
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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