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Temporal fenestrae in relation to the other skull openings in the dinosaur Massospondylus, a type of diapsid. The supratemporal fenestra, also called the upper temporal fenestra, is positioned above the other fenestra and is exposed primarily in dorsal (top) view. In some reptiles, particularly dinosaurs, the parts of the skull roof lying ...
The elliptical upper temporal fenestra was visible only looking at the top of the skull. The left and right upper temporal fenestrae were separated by the sagittal crest, which would have provided lateral attachment surfaces for the jaw musculature in the living animal. [1] Diagrams showing the dentition of the upper and lower jaw
This schematic shows the skull viewed from the left side. The middle opening is the orbit of the eye; the opening to the right of it is the temporal fenestra. Synapsids evolved a temporal fenestra behind each eye orbit on the lateral surface of the skull. It may have provided new attachment sites for jaw muscles.
Diagram of the diapsid skull with temporal openings, unlike in anapsids. The name Diapsida means "two arches", and diapsids are traditionally classified based on their two ancestral skull openings (temporal fenestrae) posteriorly above and below the eye.
The skull is about 3.2 centimetres (1.3 in) in length, with a short, pointed snout, large orbits (eye sockets), and broad upper and lower temporal fenestrae. Most skull bones are ornamented by tiny pits, especially in the upper part of the skull and around the orbit. The premaxilla is small and unspecialized, with three teeth.
Skull diagram Skull fossil (specimen KUVP 8351) Specimens reveal that Petrolacosaurus had a slightly elongated skull with two temporal fenestrae. The upper temporal fenestra is located posteriorly to an enlarged orbit. This is a distinctly diapsid character.