Crocodiles and the tuatara have a true diapsid skull with a dorsal and lateral opening.

Stack Exchange Network. Comparison between synapsid and diapsid skulls About this image: Synapsids are a class of animals that includes mammals and everything more closely related to mammals than to reptiles and birds. Based on that, there are three groups of amniotes, as anapsids, synapsids and diapsids. Synapsids have one temporal fenestra behind each eye. The research I have done has yielded some mixed results. It is situated below the postorbital bone, in a position more like the lower of the two fenestrae in diapsids.

Lizards have only one dorsal opening while snakes have an even more modified diapsid skull, having completely lost the upper temporal arch between the two openings (Bellairs 1969b; Carroll 1979; Pough 1998f). Did synapsid skulls evolve from diapsid skulls or vice versa? Diapsid definition, (of reptiles) having two openings in the skull behind each eye, characteristic of the subclasses Lepidosauria and Archosauria, including all living reptiles except turtles.

The synapsid reptiles are all extinct, but mammals are postulated to be descended representatives of the synapsids. Summary – Diapsid vs Synapsid.

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One is inferior (smaller) and one superior (bigger). They have single skull opening (called the temporal fenestra) behind each eye.

(c) Diapsid Skull: Perhaps the most famous diapsids are the dinosaurs, but diapsid also covers snakes, crocodiles, lizards and birds.There are two temporal fenestrae behind the orbit. Anapsids have no temporal fenestrae. Synapsids have one temporal fenestra behind the eye. The euryapsids are extinct.

Aditionally, do birds have diapsid skulls?

Amniotes have a temporal region in the skull which can either be solid or have openings called temporal fenestrae.

In the synapsid condition the dorsal border of the fenestra is formed mainly by the squamosal and postorbital bones, although the parietal may occasionally participate, whereas the ventral border is formed mainly by the squamosal and jugal bones, with the quadratojugal bone occasionally contributing.

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