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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.
Skeletal diagram combining several specimens (above), compared with the closely related genus Baryonyx The describers established some autapomorphies (unique derived traits) of Suchomimus to separate it from other theropods, including the expanded rear dorsal, sacral, and front caudal neural spines, the robust upper corners of the humerus, and ...
Traditionally, Spinosauridae is divided into two subfamilies: Spinosaurinae, which contains the genera Icthyovenator, Irritator, Oxalaia, Sigilmassasaurus and Spinosaurus, is marked by unserrated, straight teeth, and external nares which are further back on the skull than in baryonychines, [10] [51] and Baryonychinae, which contains the genera ...
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.
With extreme damage to the septum and columella, the two nostrils are no longer separated and form a single larger external opening. Like other tetrapods, humans have two external nostrils (anterior nares) and two additional nostrils at the back of the nasal cavity, inside the head (posterior nares, posterior nasal apertures or choanae). They ...
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°
Labeled skull diagram of the related and possibly synonymus Spinosaurus In 2017, a phylogenetic analysis by the Brazilian palaeontologists Marcos Sales and Cesar Schultz concluded that Oxalaia was more closely related to African spinosaurines than to Brazilian spinosaurines like Angaturama , as indicated by a wider snout and the lack of a ...
Scale diagram showing the size of E. brumpti (orange). Euthecodon was a large-bodied crocodilian with an elongated snout similar to that of extant gavialoids.Euthecodon differs from any other known longirostrine crocodilian in its deeply scalloped rostral margins, each tooth sitting in its own bony sheath, separated from the next by a notable constriction of the rostrum, given the skull a saw ...