anapsid

anapsid

[uh-nap-sid]
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:
1930–35; < 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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American Heritage
Science Dictionary
anapsid  [%PREMIUM_LINK%]     (ə-nāp'sĭd)  Pronunciation Key 
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.

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