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anapsid

[uh-nap-sid] /əˈnæp sɪd/
adjective
1.
belonging or pertaining to the Anapsida, a subclass of reptiles, extinct except for the turtles, characterized by having no opening in the temporal region of the skull.
noun
2.
a reptile of the subclass Anapsida.
Compare diapsid.
Origin
1930-1935
1930-35; < Neo-Latin Anapsida, equivalent to an- an-1 + -apsida, plural of -apsidum, neuter adj. derivative of Greek apsís, hapsís loop, arch (referring to the opening in the skull); see apsis
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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anapsid in Science
anapsid
  (ə-nāp'sĭd)   
A reptile having a skull with no temporal openings. The earliest reptiles, the cotylosaurs, were anapsids, as are modern turtles. Anapsids probably gave rise to the diapsids and synapsids. Compare diapsid, synapsid, therapsid.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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