The newest ventral articular skin carries a couple convex counters divided by the a beneficial concave skin

5.2.thirteen Squamosal

The morphology and you may laterally facing positioning of one’s squamosal is extremely like aetosaurs such as for example S. robertsoni, A great. ferratus, P. andressorum, and you may D. spurensis (Contour 4u, v; Walker, 1961 : fig. 2; Small, 2002 : fig. 2; Schoch, 2007 : fig. 8; Schoch & Desojo, 2016 : fig. 4). The newest strangely-molded squamosal (referred to as “sword-like” getting A good. ferratus because of the Schoch, 2007 ) forms the fresh new posterodorsal margin of the supratemporal fenestra. T. ruthae has an excellent sideways created squamosal; but not, R. callenderi and you can aetosaurs lack the noticable ventral projection included in you to taxon (Ezcurra mais aussi al., 2017 ).

The brand new squamosal carries three processes, an enthusiastic prior processes, a great posterodorsal techniques, and you may a great posteroventral process. The mediolaterally narrow anterior processes 's the largest of the about three and you will articulates ventrally on the quadratojugal, versions a tiny part of the posterodorsal margin of one’s horizontal temporary fenestra, and you may articulates dorsally towards the posteroventral side of the brand new postorbital. A horizontal ridge on dorsal part of the squamosal bounds the newest supratemporal fenestra sideways and you can continues anteriorly onto the dorsolateral margin of your own postorbital. A tiny anteriorly leading top of your anterior process of new squamosal underlies an effective posterodorsal projecting prong of one’s dorsal process of the latest jugal. It get in touch with excludes brand new postorbital out-of contribution on margin away from the brand new infratemporal fenestra as stated previously, just as the symptom in P. kirkpatricki (Weinbaum, 2011 ), and differing on the condition in aetosaurs (age.g., P. andressorum, Schoch & Desojo, 2016 ). A small position to the anteroventral body of your prior process fits a finer dorsal procedure of the newest quadratojugal.

The brand new rear part of the squamosal stretches rear on the direct of quadrate and divides to your good posteroventral and an enthusiastic anterodorsal procedure. Your face of the quadrate suits toward a distinct ventrally against fossa you to expands on the prior part of the posteroventral process (Shape 4v); hence, new posteroventral techniques while the horizontal edge of brand new articulation surface covers your face of your quadrate regarding lateral have a look at. At the same time, on the posteroventral osal, discover a flat, posteriorly up against bookshelf one allows this new thin anterodorsal margin of the quadrate. Brand new posterior facial skin of one’s posteroventral processes enjoys a little aspect one articulates on paroccipital process of the latest opisthotic (Contour 4v). In the place of extremely archosauriforms, so it aspect are thickened mediolaterally and you can game to the a knob similar for the condition in T. dabanensis (IVPP V3237) and you will aetosaurs (Nesbitt, 2011 ). Brand new posterodorsal processes carries a slit into its posterior border that fits brand new posterolateral procedure of new parietal.

Among the many skeleton of your own palate, the fresh new vomers aren’t acknowledged regarding people understood sample. However, the latest ectopterygoid, pterygoid, and palatine is actually managed during the PEFO 34561 and an extra ectopterygoid known (PEFO 33857); the brand new palate is done but blurry within the PEFO 34089 (Shape three dimensional).

5.2.14 Pterygoid

Though none are completely preserved (Profile 5a), the pterygoid contains the latest anterior techniques, horizontal procedure, and you will rear process. The fresh anterior processes was triangular into the get across-part having a taller dorsal ridge you to distills the newest feature within the fresh new midline. The brand new ventral body with the procedure is concave. They tapers anteriorly nevertheless the contact with the newest palatine was not familiar. Brand new lateral procedure contains a posteriorly directed side one to hills posteroventrally. The lateral portion of the ventral surface features a huge facet over the whole amount of the latest lateral procedure that articulates that have the fresh dorsal surface of the ectopterygoid (Shape 5a). The fresh new pterygoid person is a thin, vertically dependent knife. Brand new ventral facial skin holds a circular anteroposteriorly established ridge you to definitely continues onto the anterior techniques. Pterygoid white teeth try missing. The newest rear procedure (= quadrate processes) is actually broken-in most of the specimens (elizabeth.g., PEFO 34561) rear to your articulation point for the partial-round fossa into the basipterygoid means of the brand new parabasisphenoid. The newest anteroposterior amount of new pterygoid is like you to definitely inside the archosauriforms particularly Erythrosuchus africanus (Gower, 2003 ) and P. kirkpatricki (TTU P-9000), instead of the anteroposteriorly abbreviated pterygoids regarding aetosaurs (elizabeth.g., L. meadei, TMM 31185-98; Neoaetosauroides engaeus, PVL 5698).