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Furthermore, their supratemporal fenestrae are proportionally small and become smaller during ontogeny.

The supraoccipital also has a medial crest that extends a short distance posteriorly from the supratemporal crest onto the exoccipitals at their dorsal line of fusion.

A slight posterior extension of the parietal crests forms the supratemporal crest, which is present on the posterior part of the parietal and on the anterior part of the supraoccipital.

The skull in both orders has lost a number of primitive dermal bones in the posterior part; these are: basioccipital, supraoccipital, postparietal, intertemporal, supratemporal, and tabular.

Laterally the parietal meets the medial angle of the postorbital and the medial border of the supratemporal.