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anapsid
(redirected from Anapsids)

    Also found in: Wikipedia 0.01 sec.
anapsid  (-npsd)
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 diapsidsynapsidtherapsid
ThesaurusLegend:  Synonyms Related Words Antonyms
Noun1.anapsid - primitive reptile having no opening in the temporal region of the skullanapsid - primitive reptile having no opening in the temporal region of the skull; all extinct except turtles
anapsid reptile
reptile, reptilian - any cold-blooded vertebrate of the class Reptilia including tortoises, turtles, snakes, lizards, alligators, crocodiles, and extinct forms
Anapsida, subclass Anapsida - oldest known reptiles; turtles and extinct Permian forms
chelonian, chelonian reptile - a reptile of the order Chelonia
diapsid, diapsid reptile - reptile having a pair of openings in the skull behind each eye
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Generations of paleontologists have regarded turtles as outsiders among modern reptiles--holdovers from an ancient group called anapsids that lack holes in the sides of their skulls.
Turtles and crocs: Strange relations by Science News
Rieppel and deBraga conducted a detailed computer analysis of reptiles which revealed that turtles share more characteristics with diapsids -- modern-day reptiles -- than with anapsids, the more primitive reptile clade to which they long have been assigned.
Turtles misplaced on reptile family tree by USA Today (Magazine)
According to the standard evolutionary story, turtles retain some characteristics of the ancient anapsids.
Turtle genes upset reptilian family tree by Monastersky, Richard / Science News
 
 
 
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