The pterygoid bones extend in the upper jaw and enclose small interpterygoid vacuities that are present on each side of the cultriform processes of the parasphenoids.
2.
It is based on a single autapomorphy, a broad triangular parasphenoid cultriform process that is as long as the posterior interpterygoid vacuities, and also on a unique character combination.
3.
They are defined as all eryopoids with interpterygoid vacuities ( spaces in the interpterygoid bone ) that are rounded at the front; and large external nares ( Laurin and Steyer 2000 ).
मोबाइल