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Extremely elongated external nares, with posterior margins posterior to the anterior margin of the antorbital fossa and maxillary fenestrae. A short ventral margin of the premaxilla. The depth of the antorbital fossa ventral to the antorbital fenestra being much greater than that of the maxilla below the antorbital fossa. A ventrally concave ...
The external nares (nostril holes) are elongated, much larger than the antorbital fenestrae (a hole on the side of the skull). Many aetosaurs have a small knob on the premaxilla which projects into the nares from below.
The external nares (singular: external naris, also: bony nostrils [55]) are a pair of external skull openings for the nostrils. Important landmarks in the skull, they are primitively located in front of the antorbital fenestra near the tip of the snout.
Most species of birds have external nares located somewhere on their beak. The nares are two holes—circular, oval or slit-like in shape—which lead to the nasal cavities within the bird's skull, and thus to the rest of the respiratory system. [10] (p375) In most bird species, the nares are located in the basal third of the upper mandible.
It consists of a nasal cavity inside the head, and an external nose on the face. The external nose houses the nostrils, or nares, a pair of tubes providing airflow through the nose for respiration. Where the nostrils pass through the nasal cavity they widen, are known as nasal fossae, and contain turbinates and olfactory mucosa.
nares: the external nares face dorsally; and the internarial bar is absent; jugal: the jugal forms a substantial part of the caudoventral margin of the antorbital fenestra; quadratojugal processes: the angle between the rostral quadratojugal process and the dorsal quadratojugal process is approximately 130°
Alternatively, Dodson's analysis of structure sizes in large Protoceratops found that they were dimorphic. The length and width of the frill, parietal fenestra, and external nares, the nasal height, the skull width, the orbit height, and the coronoid process height all varied with sex.
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