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August 13, 2022

The newest ventral articular body carries a couple of convex surfaces split up of the a good concave facial skin

5.dos.13 Squamosal

The fresh morphology and you can laterally against direction of your squamosal may be very similar to that of aetosaurs like S. robertsoni, An effective. ferratus, P. andressorum, and D. spurensis (Figure 4u, v; Walker, 1961 : fig. 2; Quick, 2002 : fig. 2; Schoch, 2007 : fig. 8; Schoch & Desojo, 2016 : fig. 4). The latest oddly-molded squamosal (named “sword-like” to own Good. ferratus from the Schoch, 2007 ) variations the brand new posterodorsal margin of supratemporal fenestra. T. ruthae also offers a beneficial laterally centered squamosal; not, R. callenderi and you will aetosaurs do not have the pronounced ventral projection used in one taxon (Ezcurra mais aussi al., 2017 ).

New squamosal carries around three procedure, a keen anterior processes, a good posterodorsal processes, and you will a good posteroventral procedure. The new mediolaterally narrow anterior procedure is the largest of around three and you can articulates ventrally to your quadratojugal, forms a tiny part of the posterodorsal margin of lateral temporal fenestra, and you can articulates dorsally towards the posteroventral side of the fresh postorbital. A horizontal ridge for the dorsal part of the squamosal bounds new supratemporal fenestra sideways and you can continues anteriorly onto the dorsolateral margin of the postorbital. A tiny anteriorly directing top of prior process of this new squamosal underlies a beneficial posterodorsal projecting prong of your dorsal procedure for brand new jugal. It contact excludes the newest postorbital away from involvement regarding the margin out-of the fresh new infratemporal fenestra as previously mentioned in earlier times, just like the symptom in P. kirkpatricki (Weinbaum, 2011 ), and different on condition in aetosaurs (age.grams., P. andressorum, Schoch & Desojo, 2016 ). A small slot towards anteroventral facial skin of the anterior process matches a thin dorsal procedure for brand new quadratojugal.

This new rear portion of the squamosal offers rear toward lead of quadrate and divides with the good posteroventral and you can an anterodorsal techniques. Your mind of your quadrate matches on a distinct ventrally up against fossa you to definitely extends onto the prior an element of the posteroventral process (Figure 4v); ergo, the brand new posteroventral process as well as the lateral edge of the articulation surface covers your head of your quadrate out-of lateral take a look at. At the same time, into the posteroventral osal, there’s an apartment, posteriorly facing shelf that allows the new narrow anterodorsal margin of your quadrate. The new rear surface of the posteroventral processes has actually a small part one to articulates to the paroccipital procedure of the brand new opisthotic (Profile 4v). Instead of very archosauriforms, that it facet is thickened mediolaterally and round towards the a manhood equivalent on the symptom in T. dabanensis (IVPP V3237) and you can aetosaurs (Nesbitt, 2011 ). The fresh posterodorsal procedure bears good slit towards its rear border you to fits the fresh new posterolateral means of new parietal.

Among the skeleton of one’s palate, brand new vomers aren’t accepted from people known specimen. not, the latest ectopterygoid, pterygoid, and you will palatine is maintained in the PEFO 34561 and you will a supplementary ectopterygoid is known (PEFO 33857); brand new palate is finished but blurry in PEFO 34089 (Contour 3d).

5.2.14 Pterygoid

Even when none are entirely benaughty arama preserved (Figure 5a), the fresh pterygoid include the prior processes, horizontal processes, and you will posterior process. Brand new anterior process is triangular when you look at the mix-section having a taller dorsal ridge you to definitely distills new element at this new midline. The new ventral facial skin associated with processes are concave. They tapers anteriorly nevertheless connection with the palatine is unknown. The fresh lateral techniques includes a great posteriorly directed side one to mountains posteroventrally. The latest horizontal portion of the ventral epidermis possesses a giant element along side whole duration of the latest lateral process that articulates that have new dorsal epidermis of the ectopterygoid (Profile 5a). The fresh new pterygoid body is a finer, vertically situated blade. The new ventral epidermis contains a circular anteroposteriorly dependent ridge one goes on onto the prior process. Pterygoid teeth is absent. The latest rear techniques (= quadrate processes) try broken-in all of the specimens (age.grams., PEFO 34561) posterior for the articulation area toward semi-rounded fossa to the basipterygoid procedure for the fresh parabasisphenoid. The newest anteroposterior duration of the latest pterygoid is much like you to when you look at the archosauriforms for example Erythrosuchus africanus (Gower, 2003 ) and you will P. kirkpatricki (TTU P-9000), instead of the anteroposteriorly abbreviated pterygoids out of aetosaurs (elizabeth.grams., L. meadei, TMM 31185-98; Neoaetosauroides engaeus, PVL 5698).

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