Into the posterior top, an articular surface for the postorbital variations a right position with brand new front–parietal articular border

Into the posterior top, an articular surface for the postorbital variations a right position with brand new front–parietal articular border

The brand new postfrontal try a little, thickened, triangular feature having an effective sculptured dorsal surface noted with grooves and pits, that is often recovered articulated towards the front (Figures 4i, j). From inside the medial have a look at, there is certainly a good triangular and you will rugose articular facial skin you to articulates that have new front and you will parietal; it suture is upright within the dorsal examine. The anterolateral boundary inside triangular element are simple and seriously concave because it forms an element of the orbital margin and you will the newest relevant orbital fossa with the ventral surface. The latest postorbital is actually omitted in the supratemporal fenestra by junction of parietal together with postorbital (Numbers 3a, b).

5.dos.8 Prefrontal

The newest prefrontal is actually designed including the amount “7” in lateral examine with a distinct rugose dorsal rim you to articulates medially to your anterior portion of the frontal (Figure 4l). New rear part of the ventral procedure models brand new anterodorsal margin of orbit and contains a soft, posterolaterally against, and quite concave facial skin forming a distinct orbital fossa. New anterior margin of one’s ventral procedure is rugose and you can connections the fresh rear portion of the lacrimal. There can be a distinct groove into the lobby out-of a great rear projection of one’s lacrimal ventral towards grooved dorsal rim. The dorsal rim plans a little prior to that particular articulation. The fresh prefrontal away from R. callenderi lacks the brand new ventromedial procedure that reaches this new ectopterygoid discovered inside the crocodylomorphs at the very least certain aetosaurs (age.g., L. meadei, S. robertsoni Gower & Walker, 2002 ; Nesbitt, 2011 ).

5.2.nine Jugal

The latest jugal was triradiate having anterior, posterodorsal, and you will posterior processes (Numbers 4m, n). The latest horizontal epidermis of the jugal is ornamented that have a rugose pattern regarding pits and you can elongate grooves, therefore the extremely distinct ornamentation is located to the chief body of your own jugal for the a general anteroposteriorly trending ridge. That it large ridge toward horizontal face try a continuation out of the fresh maxillary ridge and offers regarding anteriormost part into rear idea. The brand new anterodorsal margin are concave inside the horizontal have a look at and you can models new whole posteroventral edge of the fresh orbit (Contour 4n). New ventral blackfling margin is straight inside horizontal consider. The fresh new prior processes possesses a good triangular position to your lateral body you to receives the rear process of the fresh new maxilla (find over); this slot is based for the greater ridge towards the lateral skin. Dorsal on small slot is actually a tiny dorsolaterally up against basin you to definitely receives the ventral margin of your own lacrimal, therefore excluding the new jugal out-of participation with the antorbital fenestra (Contour 4n).

The latest posterior means of the jugal tapers and you can matches for the a beneficial position regarding lateral body of the quadratojugal. New dorsal body associated with processes models new anteroventral margin from the fresh new lateral temporal fenestra, plus the rear tip of one’s jugal is present in the quantity of the fresh posterior margin of the lateral temporary fenestra.

The latest posterodorsal process versions brand new highest part of the jugal that have the fresh new tapering top getting a bit recurved posteriorly. This projection underlies new rear the main margin of your postorbital; this slight overlap almost excludes brand new postorbital of going into the horizontal temporary fenestra (Profile 3b). This new horizontal skin of posterodorsal process contains a faint longitudinal sulcus which is nearly dorsoventrally built, which is an extension of the sulcus on the horizontal surface of one’s postorbital (Shape 3b). The brand new anterior portion of the posterodorsal techniques matches the newest ventral body of postorbital, researching a keen elongate anteroventral means of new postorbital inside the a distinct groove towards the medial body of the jugal. A ventrally projecting ridge arises from the new ventral part of which groove and meets the fresh new distinctive line of posterolaterally up against pedicel that articulates that have the brand new ectopterygoid (Contour 4n). A superficial dorsal fossa is located dorsal toward epidermis away from articulation for the ectopterygoid.

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