Brand new ventral articular facial skin contains a couple convex surfaces separated because of the a concave surface

5.2.thirteen Squamosal

The latest morphology and you may laterally up against direction of the squamosal is extremely similar to that of aetosaurs like S. robertsoni, A. ferratus, P. andressorum, and you can D. spurensis (Figure 4u, v; Walker, 1961 : fig. 2; Small, 2002 : fig. 2; Schoch, 2007 : fig. 8; Schoch & Desojo, 2016 : fig. 4). The latest surprisingly-designed squamosal (known as “sword-like” to have An effective. ferratus by the Schoch, 2007 ) models the new posterodorsal margin of supratemporal fenestra. T. ruthae also offers a sideways established squamosal; yet not, Roentgen. callenderi and you can aetosaurs do not have the obvious ventral projection used in you to taxon (Ezcurra mais aussi al., 2017 ).

The fresh squamosal bears around three techniques, an anterior processes, a posterodorsal process, and a great posteroventral techniques. The latest mediolaterally slim anterior processes ‘s the prominent of your own about three and you will articulates ventrally with the quadratojugal, variations a small part of the posterodorsal margin of your lateral temporary fenestra, and you can articulates dorsally toward posteroventral side of the fresh postorbital. A horizontal ridge to the dorsal part of the squamosal bounds new supratemporal fenestra sideways and you will continues on anteriorly onto the dorsolateral margin of postorbital. A little anteriorly leading apex of one’s anterior procedure of the latest squamosal underlies an effective posterodorsal projecting prong of one’s dorsal procedure for new jugal. So it get in touch with excludes the new postorbital regarding contribution regarding margin out of brand new infratemporal fenestra as previously mentioned previously, similar to the condition in P. kirkpatricki (Weinbaum, 2011 ), and various about symptom in aetosaurs (elizabeth.g., P. andressorum, Schoch & Desojo, 2016 ). A little position on anteroventral epidermis of your own anterior processes suits a thin dorsal means of the brand new quadratojugal.

The brand new rear part of the squamosal offers posterior towards the direct of your own quadrate and splits on a posteroventral and you will an anterodorsal procedure. Your face of one’s quadrate fits for the a distinct ventrally facing fossa you to definitely extends onto the prior area of the posteroventral process (Contour 4v); for this reason, the newest posteroventral processes together with lateral side of new articulation facial skin covers your face of quadrate from lateral consider. In addition, towards posteroventral osal, discover a condo, posteriorly facing shelf you to definitely welcomes the latest thin anterodorsal margin of quadrate. The newest rear facial skin of your own posteroventral procedure provides a small factors you to articulates to the paroccipital means of brand new opisthotic (Contour 4v). Unlike extremely archosauriforms, that it element are thickened mediolaterally and circular on a penis similar on symptom in T. dabanensis (IVPP V3237) and aetosaurs (Nesbitt, 2011 ). The latest posterodorsal processes bears a slit toward the posterior border one matches brand new posterolateral procedure for the fresh new parietal.

Among the bones of one’s palate, the new vomers are not acknowledged off people identified sample. not, the ectopterygoid, pterygoid, and you will palatine are maintained when you look at the PEFO 34561 and you can an additional ectopterygoid known (PEFO 33857); brand new palate is done but obscured from inside the PEFO 34089 (Profile three dimensional).

5.dos.fourteen Pterygoid

In the event not one are completely maintained (Shape 5a), the brand new pterygoid consists of the latest anterior process, lateral process, and you can posterior processes. The new anterior techniques try triangular in the get across-section with a large dorsal ridge that spells out the element on the latest midline. The latest ventral epidermis on the process was concave. They tapers anteriorly nevertheless the experience of this new palatine is not familiar. The latest horizontal processes includes a beneficial posteriorly indicated wing one slopes posteroventrally. The latest horizontal part of the ventral facial skin and has an enormous aspect over the whole duration of the newest lateral procedure that articulates having the latest dorsal body of one’s ectopterygoid (Contour 5a). The brand new pterygoid body’s a slimmer, vertically depending blade. The fresh ventral skin carries a circular anteroposteriorly situated ridge one goes on onto the anterior processes. Pterygoid pearly whites was missing. Brand new rear processes (= quadrate procedure) was broken-in all specimens (age.grams., PEFO 34561) rear towards the articulation part into the partial-rounded fossa towards the basipterygoid procedure for new parabasisphenoid. The fresh new anteroposterior length of new pterygoid is much like that inside the archosauriforms such as Erythrosuchus africanus (Gower, 2003 ) and you will P. kirkpatricki (TTU P-9000), as opposed to the anteroposteriorly abbreviated pterygoids out of aetosaurs (elizabeth.grams., L. meadei, TMM 31185-98; Neoaetosauroides engaeus, PVL 5698).