Diapsid

Diapsids (`two arches`) are a group of tetrapods that developed two holes (temporal fenestra) in each side of their skulls about 300 million years ago during the late Carboniferous period. Living diapsids are extremely diverse, and include all crocodiles, lizards, snakes, tuataras, and birds. Although some diapsids have lost either one hole (liz.....
Found on http://en.wikipedia.org/wiki/Diapsid

diapsid

(from the article `reptile`) ...known, and possibly in Africa and Asia. The mammal-like Therapsida and perhaps other forms were fossilized in Africa and Europe. The probable ... ...and basal group of reptiles called the Parareptilia. These early reptiles have no other modern survivors. The diapsid hypothesis suggests that ... [2 rela...
Found on http://www.britannica.com/eb/a-z/d/43

diapsid

diapsid reptile noun reptile having a pair of openings in the skull behind each eye
Found on https://www.encyclo.co.uk/local/20974

Diapsid

Diapsids include all the reptiles (except turtles) and birds. They are distinguished by having two holes in the rear upper part of their skulls and two holes behind the eyes (anorbital fenestra ).
Found on http://www.enchantedlearning.com/subjects/dinosaurs/glossary/

diapsid

n. A vertebrate distinguished by a skull with two pairs of openings in the side behind the eyes, e.g., lizards, snakes, crocodiles, dinosaurs, and pterosaurs.
Found on http://www.ucmp.berkeley.edu/glossary/gloss7metazoa.html

diapsid

n. A vertebrate distinguished by a skull with two pairs of openings in the side behind the eyes, e.g., lizards, snakes, crocodiles, dinosaurs, and pterosaurs.
Found on http://www.ucmp.berkeley.edu/glossary/glossary_7.html

diapsid

[n] - reptile having a pair of openings in the skull behind each eye
Found on http://www.webdictionary.co.uk/definition.php?query=diapsid
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