The new ventral articular facial skin holds two convex counters split by a beneficial concave surface

5.dos.thirteen Squamosal

The fresh morphology and you may laterally facing orientation of your squamosal may be very similar to that of aetosaurs instance S. robertsoni, A. ferratus, P. andressorum, and you can D. spurensis (Contour 4u, v; Walker, 1961 : fig. 2; Small, 2002 : fig. 2; Schoch, 2007 : fig. 8; Schoch & Desojo, 2016 : fig. 4). Brand new strangely-molded squamosal (named “sword-like” for A great. ferratus by the Schoch, 2007 ) versions the latest posterodorsal margin of the supratemporal fenestra. T. ruthae likewise has a beneficial sideways depending squamosal; but not, Roentgen. callenderi and you can bbpeoplemeet giriЕџ yap aetosaurs lack the noticable ventral projection used in that taxon (Ezcurra ainsi que al., 2017 ).

The squamosal bears around three techniques, an enthusiastic prior process, a beneficial posterodorsal process, and a good posteroventral techniques. The brand new mediolaterally slim anterior processes is the largest of your around three and articulates ventrally for the quadratojugal, versions a small portion of the posterodorsal margin of your own lateral temporal fenestra, and you may articulates dorsally for the posteroventral edge of the postorbital. A lateral ridge on the dorsal portion of the squamosal bounds the brand new supratemporal fenestra sideways and you may continues anteriorly onto the dorsolateral margin of postorbital. A little anteriorly pointing top of anterior procedure for the brand new squamosal underlies an excellent posterodorsal projecting prong of one’s dorsal procedure of this new jugal. This contact excludes brand new postorbital off contribution throughout the margin away from the infratemporal fenestra as previously mentioned in earlier times, similar to the symptom in P. kirkpatricki (Weinbaum, 2011 ), and different in the symptom in aetosaurs (age.grams., P. andressorum, Schoch & Desojo, 2016 ). A tiny position towards the anteroventral body of your own prior process fits a slimmer dorsal procedure of this new quadratojugal.

The fresh new rear portion of the squamosal stretches posterior into direct of your own quadrate and you can splits on the an excellent posteroventral and you will an anterodorsal techniques. Your head of your quadrate fits to the a definite ventrally against fossa you to definitely expands onto the prior a portion of the posteroventral process (Shape 4v); ergo, new posteroventral processes and horizontal side of the fresh new articulation epidermis covers your head of your own quadrate out-of lateral look at. Additionally, to the posteroventral osal, there clearly was an apartment, posteriorly against shelf you to allows the new narrow anterodorsal margin of the quadrate. The fresh rear skin of the posteroventral processes possess a little element one articulates toward paroccipital procedure for this new opisthotic (Contour 4v). Unlike extremely archosauriforms, it factors is actually thickened mediolaterally and game to the a cock equivalent towards condition in T. dabanensis (IVPP V3237) and you will aetosaurs (Nesbitt, 2011 ). The brand new posterodorsal process contains a good slit to your the rear line one to suits the fresh posterolateral process of the new parietal.

One of many skeleton of the palate, this new vomers are not recognized away from one understood specimen. Yet not, the newest ectopterygoid, pterygoid, and you will palatine is maintained during the PEFO 34561 and an extra ectopterygoid is well known (PEFO 33857); the brand new palate is done but blurry within the PEFO 34089 (Figure 3d).

5.2.fourteen Pterygoid

In the event not one are entirely kept (Figure 5a), the newest pterygoid contains the prior processes, horizontal process, and you can posterior process. Brand new prior processes is triangular in mix-part with a large dorsal ridge one spells out the fresh new ability within the newest midline. The new ventral facial skin from the techniques is actually concave. It tapers anteriorly nevertheless the experience of this new palatine is unknown. The brand new horizontal process consists of a posteriorly pointed wing one to mountains posteroventrally. The newest horizontal portion of the ventral skin and also a large facet along side whole period of new lateral process that articulates which have new dorsal epidermis of the ectopterygoid (Profile 5a). New pterygoid body is a finer, vertically centered blade. Brand new ventral skin holds a circular anteroposteriorly depending ridge you to definitely goes on onto the anterior techniques. Pterygoid pearly whites is absent. The fresh new rear processes (= quadrate process) was broken-in all of the specimens (e.g., PEFO 34561) posterior to the articulation area into the partial-game fossa toward basipterygoid means of the fresh parabasisphenoid. The brand new anteroposterior duration of this new pterygoid is much like that within the archosauriforms particularly Erythrosuchus africanus (Gower, 2003 ) and P. kirkpatricki (TTU P-9000), rather than the anteroposteriorly abbreviated pterygoids out of aetosaurs (elizabeth.grams., L. meadei, TMM 31185-98; Neoaetosauroides engaeus, PVL 5698).

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