The new postfrontal is a tiny, thickened, triangular feature which have a good sculptured dorsal body designated which have grooves and you can pits, that’s often retrieved articulated on the frontal (Rates 4i, j). For the medial consider, there’s a beneficial triangular and you can rugose articular skin you to definitely articulates with new front and parietal; that it suture try straight inside dorsal consider. The brand new anterolateral boundary within triangular function is effortless and deeply concave since it versions area of the orbital margin and you may new related orbital fossa on the ventral skin. This new postorbital try omitted in the supratemporal fenestra of the junction of your own parietal and postorbital (Figures 3a, b).
5.2.8 Prefrontal
The latest prefrontal is actually molded like the number “7” within the horizontal check that have a distinct rugose dorsal rim one to articulates medially on anterior portion of the front (Profile 4l). The new posterior portion of the ventral techniques forms brand new anterodorsal margin of the orbit and also a flaccid, posterolaterally facing, and you can some concave skin forming a distinct orbital fossa. The newest anterior margin of the ventral procedure is actually rugose and you will relationships the brand new rear part of the lacrimal. There was a definite groove to the reception away from good posterior projection of your lacrimal ventral on grooved dorsal rim. The dorsal rim projects slightly anterior to that articulation. This new prefrontal regarding Roentgen. callenderi does not have the new ventromedial process that gets to the latest ectopterygoid found from inside the crocodylomorphs at minimum specific aetosaurs (age.grams., L. meadei, S. robertsoni Gower & Walker, 2002 ; Nesbitt, 2011 ).
5.dos.9 Jugal
The fresh jugal is triradiate having prior, posterodorsal, and you will rear process (Rates 4m, n). New horizontal epidermis of one’s jugal is actually ornamented that have an effective rugose trend of pits and elongate grooves, and extremely line of ornamentation is located on head system of the jugal on the an over-all anteroposteriorly popular ridge. That it broad ridge into the horizontal deal with was a continuation from the brand new maxillary ridge and you will stretches regarding anteriormost bit on the posterior tip. The newest anterodorsal margin was concave into the lateral consider and you can versions the brand new whole posteroventral edge of the fresh orbit (Shape 4n). The fresh ventral margin try straight inside horizontal view. New prior procedure possesses a triangular slot to your horizontal surface one to gets the posterior means of the maxilla (look for over); that it position can be found towards the large ridge towards the lateral surface. Dorsal to your quick position is actually a small dorsolaterally facing basin one gets the ventral margin of lacrimal, hence excluding the fresh jugal out of contribution on the antorbital fenestra (Figure 4n).
The brand new posterior means of the latest jugal tapers and you can fits into the a slot about horizontal skin of quadratojugal. This new dorsal body with the techniques versions the brand new anteroventral margin out-of the latest lateral temporary fenestra, additionally the rear tip of your jugal is obtainable from the level of the fresh posterior margin of the horizontal temporary fenestra.
This new posterodorsal process forms the brand new highest portion of the jugal that have new tapered apex getting a bit recurved posteriorly. It projection underlies this new rear a portion of the margin of postorbital; so it moderate overlap nearly excludes the newest postorbital out-of going into the horizontal temporal fenestra (Contour 3b). The new lateral epidermis of one’s posterodorsal techniques bears a weak longitudinal sulcus which is almost dorsoventrally created, which is a continuation of your own sulcus into the lateral facial skin of your own postorbital (Profile 3b). Brand new prior part of the posterodorsal processes suits the fresh ventral epidermis of your postorbital, receiving an elongate anteroventral procedure for the newest postorbital when you look at the a distinct groove towards medial body of your jugal. An effective ventrally projecting ridge originates from new ventral percentage of that it groove and you will meets brand new collection of posterolaterally up against pedicel you to definitely articulates which have new ectopterygoid (Contour 4n). A shallow dorsal fossa is situated dorsal into the facial skin off articulation on ectopterygoid.