A little foramen exists simply ventral into posterior avoid of the dorsolateral ridge, to your posterolateral skin of surangular. The fresh new foramen entry anteromedially from the surangular to depart into the deep fossa to the prior area of the medially projecting process. The fresh medial term of your own foramen try bigger than the new lateral term as with Age. okeeffeae, S. inexpectatus, aetosaurs (age.g., L. meadei and you may D. spurensis), Euparkeria capensis, H. ischigualastensis, P. kirkpatricki, and you may Crocodylomorpha (Gower & Weber, 1998 ; Nesbitt, 2007 , 2011 ; Short, 2002 ; Weinbaum, 2011 ).
Various other foramen is anterodorsal towards the you to definitely only described towards the the posterolateral skin of surangular, also below the dorsolateral ridge, however, prior into the glenoid. For the medial skin of your own surangular, this new likely leave for it foramen takes place in various other anteriorly up against concavity simply prior on higher foramen for the anterior front of the medial projection; those two medial foramina was split up by the a little crest. This new medial epidermis of one’s surangular is concave prior to the foramina.
Brand new angular at the very least called the brand new posterior area of the ventral side of this new surangular that can has contacted most of the ventral line and you can partially overlapped the brand new ventral prior projection of your surangular. The little additional mandibular fenestra is obtainable amongst the main and you may ventral prior forecasts of your surangular, into main projection of dentary forming this new anterodorsal edging, as well as the angular building the newest ventral border.
5.3.3 Angular
Brand new powerful angular forms the newest posteroventral portion of the hemimandible. The brand new medially prolonged ventral boundary keeps a facet towards prearticular to your anterior portion (Figure 5f). The new posterior a portion of the dorsal margin has a finer tongue of limbs that suits to the a position toward ventral margin of one’s surangular. Including the surangular, the fresh lateral surface carries a great rugose pattern. Anteriorly, the fresh lateral body of the surangular enjoys an excellent triangular slot you to definitely allows the fresh new ventral rear procedure of brand new dentary over the ventral margin of your mouth.
5.step three.4 Splenial
The newest mediolaterally slim splenial (Profile 5g) discusses the complete Meckelian groove of one’s dentary. The fresh new tapered prior piece doesn’t participate in the brand new mandibular symphysis (Figure three dimensional) because it really does in a number of aetosaurs (age.g., P. andressorum, Schoch & Desojo, 2016 ). The latest ventral margin has good hit bottom articular body on elite singles the ventral margin of the dentary. An equivalent facial skin toward dorsal margin articulates into the dentary just over the Meckelian groove and you may ventral into bookshelf who has the new enamel row.
5.step 3.5 Articular
The new articular (Shape 5h–j) is one of are not recovered isolated cranial element in the new Revueltosaurus Quarry (PFV 297). From inside the articulation with the surangular, the newest glenoid surface was created anteromedially/posterolaterally. The brand new medial part of the glenoid is a bit concave to match the massive medial condyle of your own quadrate, and horizontal part of the glenoid are convex to complement the latest concavity involving the condyles to the quadrate. The latest anterior boundary of your own glenoid isn’t type of alternatively with the posterior boundary, that has an incredibly sharp and you can common rim. The fresh new anteriormost part of the horizontal epidermis of the articular contains a distinct fossa, hence receives the medial procedure of the latest surangular (pick below).
Posterior into posterior boundary of glenoid to the dorsal surface of one’s retroarticular techniques, discover an enthusiastic arcuate, laterally tapering, and you may seriously concave fossa (Figure 5i). New horizontal and you will medial finishes of one’s fossa lay dorsal to help you dorsoventrally thickened sides that overhang the new medial and you may lateral edges out of the articular. The horizontal one of those overlaps the newest dorsal side of the fresh new surangular. New medial part of the arcuate fossa contains a definite foramen that pierces the articular, leaving anteroventrally from medial wall with the prior side of the newest medial line. That it foramen could be homologous that have the same element within the rauisuchids, phytosaurs (Nesbitt, 2011 ), or other archosauriforms (Sookias mais aussi al., 2020 ). Rear to your arcuate fossa, there is a prominent mediolaterally compressed crest within rear prevent of one’s retroarticular process. Brand new ventral skin of the crest are confluent having an obvious median ridge that offers across the ventral facial skin of the articular.