Averostra, or `bird snouts`, is a clade that includes most theropod dinosaurs that have a promaxillary fenestra (fenestra promaxillaris), an extra opening in the front outer side of the maxilla, the bone that makes up the upper jaw. ==Definition== Averostra was named by Gregory S. Paul in 2002 as an apomorphy-based clade defined as the group inc.....
Found on http://en.wikipedia.org/wiki/Averostra
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