The fresh ventral articular surface contains one or two convex counters split from the good concave body

5.dos.13 Squamosal

This new morphology and you will sideways up against orientation of your squamosal is extremely similar to that of aetosaurs such as for example S. robertsoni, An excellent. ferratus, P. andressorum, and you can D. spurensis (Profile 4u, v; Walker, 1961 : fig. 2; Short, 2002 : fig. 2; Schoch, 2007 : fig. 8; Schoch & Desojo, 2016 : fig. 4). The new strangely-designed squamosal (referred to as “sword-like” having A. ferratus because of the Schoch, 2007 ) forms this new posterodorsal margin of your supratemporal fenestra. T. ruthae even offers a sideways centered squamosal; not, R. callenderi and you will aetosaurs do not have the obvious ventral projection used in one to taxon (Ezcurra et al., 2017 ).

Brand new squamosal bears about three techniques, a keen prior techniques, an effective posterodorsal processes, and you can a beneficial posteroventral process. New mediolaterally slim prior techniques is the premier of three and you can articulates ventrally to your quadratojugal, versions a small portion of the posterodorsal margin of horizontal temporary fenestra, and you may articulates dorsally into the posteroventral side of the fresh new postorbital. A horizontal ridge to the dorsal portion of the squamosal bounds the supratemporal fenestra laterally and you can continues anteriorly on the dorsolateral margin of postorbital. A small anteriorly directing apex of your own anterior means of the new squamosal underlies a posterodorsal projecting prong of your own dorsal process of this new jugal. That it get in touch with excludes brand new postorbital off involvement regarding margin of the newest infratemporal fenestra as previously mentioned prior to now, just like the symptom in P. kirkpatricki (Weinbaum, 2011 ), and other regarding the symptom in aetosaurs (age.grams., P. andressorum, Schoch & Desojo, 2016 ). A small position into anteroventral body of the anterior process matches a thin dorsal process of the new quadratojugal.

The fresh rear portion of the squamosal runs posterior towards the lead of quadrate and you can splits on a good posteroventral and you may a keen anterodorsal techniques. Your head of your own quadrate suits with the a distinct ventrally up against fossa that expands on the prior the main posteroventral process (Figure 4v); thus, new posteroventral techniques and also the horizontal side of the articulation skin covers your face of your quadrate of lateral evaluate. On top of that, towards the posteroventral osal, there clearly was a flat, posteriorly up against bookshelf one welcomes the latest thin anterodorsal margin of one’s quadrate. The rear body of one’s posteroventral procedure keeps a small factors one articulates to your paroccipital procedure for the new opisthotic (Figure 4v). In place of very archosauriforms, it element are thickened mediolaterally and you can rounded to the a penis similar on the condition in T. dabanensis (IVPP V3237) and aetosaurs (Nesbitt, 2011 ). The brand new posterodorsal procedure carries a beneficial slit into its posterior line one suits the fresh new posterolateral procedure of the new parietal.

One of many skeleton of your own palate, the fresh new vomers aren’t recognized out-of one known sample. not, the newest ectopterygoid, pterygoid, and you will palatine is actually kept within the PEFO 34561 and an extra ectopterygoid is famous (PEFO 33857); the palate is done but obscured from inside the PEFO 34089 (Contour 3d).

5.dos.fourteen Pterygoid

In the event not one are completely kept (Figure 5a), this new pterygoid consists of the fresh anterior techniques, lateral processes, and you may rear process. The newest anterior techniques try triangular when you look at the cross-part having a taller dorsal ridge you to distills the fresh ability during the brand new midline. New ventral facial skin associated with the process try concave. It tapers anteriorly nevertheless exposure to the latest palatine are not familiar. The latest horizontal process includes a posteriorly directed wing one mountains posteroventrally. New lateral portion of the ventral skin possesses a huge aspect over the entire duration of the newest horizontal procedure that articulates which have the dorsal skin of the ectopterygoid (Profile 5a). The brand new pterygoid body’s a slimmer, vertically founded blade. The ventral skin carries a rounded anteroposteriorly oriented ridge you to definitely continues on on the anterior procedure. Pterygoid pearly whites is actually missing. This new posterior procedure (= quadrate procedure) is broken-in all of the specimens (age.g., PEFO 34561) posterior with the articulation area to your semi-game fossa towards the basipterygoid procedure of the parabasisphenoid. The anteroposterior amount of the new pterygoid is much like that into the archosauriforms including Erythrosuchus africanus (Gower, 2003 ) and you will P. kirkpatricki (TTU P-9000), rather than the anteroposteriorly abbreviated pterygoids out-of aetosaurs (e.g., L. meadei, TMM 31185-98; Neoaetosauroides engaeus, PVL 5698).