Euryapsida is a polyphyletic (unnatural, as the various members are not closely related) group of reptiles that are distinguished by a single temporal fenestra, an opening behind the orbit, under which the post-orbital and squamosal bones articulate. They are different from Synapsida, which also have a single opening behind the orbit, by the place
Found on http://en.wikipedia.org/wiki/Euryapsida
(from the article `reptile`) ...membrane of the wing. Early forms toothed and with long tails; later forms tended to be larger and to have lost both teeth and tail.Subclass ...
Found on http://www.britannica.com/eb/a-z/e/54
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