diapsid

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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.
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References in periodicals archive ?
All reptiles living today are diapsid, with the exception of turtles, previously thought to be anapsid, making them the only living primitive reptiles.
Choristoderes presumably evolved from small terrestrial-amphibious Permian diapsids within the northern part of Pangea.
Turtles fell squarely within the modern diapsids rather than in their expected position on a branch outside the group, the scientists report in the Nov.