The new ventral articular skin contains a couple convex surfaces divided of the good concave skin

The new ventral articular skin contains a couple convex surfaces divided of the good concave skin

5.dos.13 Squamosal

The new morphology and laterally facing direction of squamosal may be very similar to that of aetosaurs for example S. robertsoni, A beneficial. ferratus, P. andressorum, and you may D. spurensis (Shape 4u, v; Walker, 1961 : fig. 2; Quick, 2002 : fig. 2; Schoch, 2007 : fig. 8; Schoch & Desojo, 2016 : fig. 4). Brand new unusually-molded squamosal (also known as “sword-like” to own A good. ferratus of the Schoch, 2007 ) forms new posterodorsal margin of the supratemporal fenestra. T. ruthae also has a sideways depending squamosal; although not, R. callenderi and you can aetosaurs lack the obvious ventral projection found in one to taxon (Ezcurra mais aussi al., 2017 ).

The brand new squamosal bears about three processes, an enthusiastic prior procedure, a great posterodorsal procedure, and you will a beneficial posteroventral processes. The brand new mediolaterally slim prior process ‘s the largest of the around three and you will articulates ventrally to your quadratojugal, models a tiny portion of the posterodorsal margin of one’s horizontal temporary fenestra, and you can articulates dorsally with the posteroventral edge of this new postorbital. A horizontal ridge with the dorsal portion of the squamosal bounds the fresh supratemporal fenestra laterally and continues anteriorly onto the dorsolateral margin of your postorbital. A little anteriorly directing top of the prior procedure for the newest squamosal underlies a posterodorsal projecting prong of dorsal procedure for the fresh jugal. This contact excludes the new postorbital regarding involvement on the margin off the brand new infratemporal fenestra as previously mentioned previously, much like the symptom in P. kirkpatricki (Weinbaum, 2011 ), and various from the symptom in aetosaurs (elizabeth.grams., P. andressorum, Schoch & Desojo, 2016 ). A little slot on the anteroventral body of one’s anterior techniques matches a thinner dorsal means of the fresh quadratojugal.

The new rear portion of the squamosal stretches posterior on direct of quadrate and you may splits towards the a posteroventral and you can an enthusiastic anterodorsal techniques. Your mind of your own quadrate fits into the a distinct ventrally against fossa one runs on the prior part of the posteroventral processes (Figure 4v); for this reason, the fresh posteroventral techniques and the lateral edge of the brand new articulation surface hides your mind of the quadrate away from horizontal evaluate. At exactly the same time, towards the posteroventral osal, discover a flat, posteriorly up against bookshelf one welcomes the new slim anterodorsal margin of your own quadrate. The fresh new rear surface of posteroventral techniques possess a tiny factors you to articulates to your paroccipital process of brand new opisthotic (Contour 4v). As opposed to most archosauriforms, it facet are thickened mediolaterally and game to the a dick comparable toward symptom in T. dabanensis (IVPP V3237) and you will aetosaurs (Nesbitt, 2011 ). The latest posterodorsal process carries a beneficial slit on their rear edge that suits brand new posterolateral procedure for the latest parietal.

Among skeleton of the palate, the latest vomers aren’t acknowledged out-of any understood specimen. not, the latest ectopterygoid, pterygoid, and you can palatine is kept into the PEFO 34561 and an additional ectopterygoid is famous (PEFO 33857); the brand new palate is complete however, blurred within the PEFO 34089 (Shape 3d).

5.2.14 Pterygoid

Though none are completely managed (Contour 5a), the new pterygoid includes this new prior processes, horizontal processes, and you may rear techniques. Brand new prior procedure are triangular inside the mix-part having a high dorsal ridge one to spells out the fresh ability in the the newest midline. The fresh new ventral skin in the processes is concave. They tapers anteriorly although experience of this new palatine is unfamiliar. The newest lateral process includes a posteriorly directed wing one to hills posteroventrally. The newest horizontal part of the ventral body and has a huge aspect along side entire period of new lateral process that articulates which have the fresh new dorsal body of ectopterygoid (Contour 5a). This new pterygoid body’s a thinner, vertically centered knife. This new ventral surface carries a bent anteroposteriorly created ridge you to definitely continues on on the prior procedure. Pterygoid pearly whites was missing. The fresh new posterior processes (= quadrate processes) are broken in every specimens (e.g., PEFO 34561) rear toward articulation part with the partial-rounded fossa with the basipterygoid procedure of this new parabasisphenoid. The new anteroposterior duration of brand new pterygoid is a lot like you to definitely inside archosauriforms instance Erythrosuchus africanus (Gower, 2003 ) and you can P. kirkpatricki (TTU P-9000), rather than the anteroposteriorly abbreviated pterygoids regarding aetosaurs (elizabeth.grams., L. meadei, TMM 31185-98; Neoaetosauroides engaeus, PVL 5698).


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