diapsid


Also found in: Dictionary, Thesaurus, Wikipedia.

diapsid

  1. a vertebrate skull having two fossae, one above the other, behind the orbit.
  2. (in some classifications) a reptile of the subclass Diapsida.
Mentioned in ?
References in periodicals archive ?
Traces attributed to apterygote insects, arthropleurid myriapods, bivalved arthropods and vermiform animals occur in lake-margin sediments in association with those of temnospondyl amphibians and early diapsid reptiles, and belong to the Scoyenia ichnofacies.
All reptiles living today are diapsid, with the exception of turtles, previously thought to be anapsid, making them the only living primitive reptiles.
1999): A long-necked diapsid reptile from the Upper Jurassic/ Lower Cretaceous of Liaoning Province, north-eastern China.
That means one-way airflow may have arisen not among the early archosaurs about 250 million years ago, but as early as 270 million years ago among cold-blooded diapsids, which were the common, cold-blooded ancestors of the archosaurs and Lepidosauromorpha, a group of reptiles that today includes lizards, snakes and lizard-like creatures known as tuataras.