For the rear front, a keen articular skin on postorbital versions a right direction having the new frontal–parietal articular edge

The fresh new postfrontal are a small, thickened, triangular function having an effective sculptured dorsal facial skin noted which have grooves and pits, which is tend to recovered articulated for the frontal (Data 4i, j). In the medial view, there is certainly a triangular and you can rugose articular body you to definitely articulates having the front and you can parietal; that it suture is actually upright within the dorsal view. New anterolateral boundary in this triangular function are effortless and you can deeply concave because versions an element of the orbital margin and you may the newest relevant orbital fossa towards ventral epidermis. New postorbital are omitted regarding supratemporal fenestra of the junction of your own parietal plus the postorbital (Figures 3a, b).

5.dos.8 Prefrontal

The brand new prefrontal try shaped like the amount “7” inside lateral check with a distinct rugose dorsal rim you to articulates medially to the prior part of the frontal (Shape 4l). The brand new rear portion of the ventral processes forms the latest anterodorsal margin of orbit and has a softer, posterolaterally up against, and you may slightly concave epidermis creating a distinct orbital fossa. The newest anterior margin of ventral techniques is rugose and you can associations the rear portion of the lacrimal. There clearly was a definite groove with the lobby regarding a beneficial rear projection of one’s lacrimal ventral towards grooved dorsal rim. This new dorsal rim systems a little prior compared to that articulation. The latest prefrontal off R. callenderi lacks the latest ventromedial procedure that extends to the brand new ectopterygoid found inside the crocodylomorphs as well as the very least some aetosaurs (elizabeth.g., L. meadei, S. robertsoni Gower & 321chat ne Walker, 2002 ; Nesbitt, 2011 ).

5.dos.nine Jugal

The brand new jugal try triradiate with prior, posterodorsal, and posterior processes (Figures 4m, n). The fresh horizontal skin of your jugal are ornamented which have a good rugose trend away from pits and elongate grooves, while the most distinctive line of ornamentation is situated on main human anatomy of the jugal into the an over-all anteroposteriorly popular ridge. This broad ridge towards the lateral face try an extension away from the new maxillary ridge and you may stretches from the anteriormost part on the rear idea. Brand new anterodorsal margin is actually concave into the horizontal examine and you may variations new whole posteroventral side of brand new orbit (Figure 4n). The brand new ventral margin was upright when you look at the lateral glance at. The fresh prior process and also good triangular position into the horizontal surface you to definitely gets the rear procedure for the new maxilla (find above); this slot is positioned into broad ridge into the horizontal surface. Dorsal on the short position is a tiny dorsolaterally up against basin you to gets the ventral margin of your lacrimal, therefore leaving out the newest jugal off involvement into antorbital fenestra (Contour 4n).

The fresh new rear procedure for the new jugal tapers and you may fits towards a beneficial position regarding the horizontal surface of one’s quadratojugal. The latest dorsal epidermis in the techniques models this new anteroventral margin away from the newest lateral temporary fenestra, and also the posterior idea of the jugal is available in the quantity of brand new rear margin of the horizontal temporal fenestra.

The fresh posterodorsal process models this new highest part of the jugal having the fresh new tapering apex are a bit recurved posteriorly. So it projection underlies this new rear an element of the margin of postorbital; so it moderate convergence nearly excludes the newest postorbital out of going into the horizontal temporal fenestra (Figure 3b). This new horizontal body of your posterodorsal processes holds a light longitudinal sulcus that’s almost dorsoventrally situated, that’s an extension of your own sulcus towards horizontal epidermis of postorbital (Profile 3b). The anterior portion of the posterodorsal procedure match the brand new ventral surface of your postorbital, finding a keen elongate anteroventral process of brand new postorbital within the a distinct groove with the medial skin of your jugal. An effective ventrally projecting ridge originates from the new ventral percentage of it groove and you can match brand new collection of posterolaterally facing pedicel one to articulates with the newest ectopterygoid (Shape 4n). A superficial dorsal fossa is situated dorsal into the epidermis out-of articulation on the ectopterygoid.

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