Both taxa share a sharp ridge on the lateral margin of the maxilla that marks the lower extent of an opening called the antorbital fossa.
32.
Members of the subfamily Sigmodontinae, which includes a number of tribes, usually have the antorbital bridge below the upper surface of the skull.
33.
The nasoantorbital fenestra ( an opening incorporating the holes for the nostrils and the antorbital fenestrae ) was large and extended over the eyes and braincase.
34.
The anterior margin of the antorbital fenestra is usually bound by the maxilla near the end of the snout and the lacrimal near the eye socket.
35.
The skull opening, the antorbital fenestra, is twice as long as it is tall and has a pointed rear, below the eye socket.
36.
Low, laterally raised bony ridges were present on the dorsolateral margin of the nasal and lacrimal bones in the skull, directly above the antorbital fenestra.
37.
However, the maxilla of " Teraterpeton " has moved closer to the eye socket, touching the lacrimal and closing off the antorbital fenestra.
38.
For one, " Scaphognathus " had a proportionately shorter skull ( 4.5 in ) with a blunter tip and a larger antorbital fenestra.
39.
Another difference between " Youngosuchus " and erythrosuchids can be seen in the antorbital fenestra, a hole in the skull in front of the eyes.
40.
Comparable in size to the antorbital fenestrae of many other archosauromorphs, the narial fenestra of " Teraterpeton " is even longer than the eye socket.
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