The new postfrontal is a little, thickened, triangular element having a beneficial sculptured dorsal skin noted that have grooves and you may pits, which is often retrieved articulated towards the front (Data 4i, j). Within the medial look at, there can be good triangular and you can rugose articular surface one to articulates with brand new frontal and you may parietal; that it suture are straight from inside the dorsal view. Brand new anterolateral line within this triangular element try simple and you may seriously concave whilst versions part of the orbital margin and you can the fresh new associated orbital fossa to your ventral surface. The latest postorbital try excluded regarding the supratemporal fenestra because of the junction of the parietal together with postorbital (Data 3a, b).
5.2.8 Prefrontal
New prefrontal are designed like the count “7” within the lateral examine with a distinct rugose dorsal rim one to articulates medially toward anterior portion of the front (Figure 4l). Brand new rear part of the ventral procedure variations the newest anterodorsal margin of the orbit and also a smooth, posterolaterally facing, and you will some concave body building a distinct orbital fossa. Brand new prior margin of your own ventral techniques are rugose and you may contacts new posterior part of the lacrimal. You will find a definite groove on the reception of a great posterior projection of one’s lacrimal ventral on grooved dorsal rim. The fresh dorsal rim systems a bit anterior to that particular articulation. The latest prefrontal from R. callenderi lacks the latest ventromedial procedure that reaches the newest ectopterygoid discovered from inside the crocodylomorphs at least specific aetosaurs (elizabeth.g., L. meadei, S. robertsoni Gower & Walker, 2002 ; Nesbitt, 2011 ).
5.2.nine Jugal
The new jugal was triradiate with prior, posterodorsal, and you will posterior processes (Figures 4m, n). The fresh lateral body of the jugal are ornamented with a beneficial rugose trend away from pits and you can elongate grooves, and really line of ornamentation is situated on the main system of your jugal into the an over-all anteroposteriorly trending ridge. So it greater ridge on the horizontal deal with are a continuation regarding this new maxillary ridge and you can offers from the anteriormost part on the rear idea. New anterodorsal margin is concave within the lateral look at and you will variations this new entire posteroventral side of the orbit (Figure 4n). The brand new ventral margin are upright from inside the lateral examine. New anterior procedure and has now a beneficial triangular slot on lateral epidermis that gets the posterior means of brand new maxilla (pick a lot more than); so it slot is situated to the wide ridge to your lateral body. Dorsal into the short position try a little dorsolaterally against basin that gets the ventral margin of lacrimal, for this reason excluding the fresh new jugal off involvement to the antorbital fenestra (Shape 4n).
The latest rear means of this new jugal tapers and you can fits towards the a beneficial slot throughout the lateral skin of the quadratojugal. The fresh dorsal body of process forms the brand new anteroventral margin out-of the brand new lateral temporary fenestra, additionally the rear suggestion of your jugal is present during the amount of the posterior margin of your lateral temporal fenestra.
The latest posterodorsal techniques forms the fresh new tallest portion of the jugal having the fresh tapering top are somewhat recurved posteriorly. So it projection underlies the newest posterior the main margin of postorbital; that it moderate convergence nearly excludes the postorbital out-of going into the horizontal temporal fenestra (Contour 3b). The fresh new horizontal facial skin of posterodorsal process contains a weak longitudinal sulcus which is almost dorsoventrally established, that’s a continuation of your own sulcus on the lateral facial skin of postorbital (Shape 3b). The prior part of the posterodorsal procedure matches brand new ventral surface of your postorbital, getting a keen elongate anteroventral procedure of the postorbital when you look at the a definite groove toward medial surface of the jugal. An excellent ventrally projecting ridge is inspired by the ventral percentage of that it groove and you may match the fresh collection of posterolaterally facing pedicel that articulates which have this new ectopterygoid (Shape 4n). A low dorsal fossa is based dorsal with the facial skin off articulation on the ectopterygoid.
