5.dos.13 Squamosal
Brand new morphology and you may laterally up against orientation of your squamosal may be very like aetosaurs eg S. robertsoni, A beneficial. ferratus, P. andressorum, and you may D. spurensis (Shape 4u, v; Walker, 1961 : fig. 2; Small, 2002 : fig. 2; Schoch, 2007 : fig. 8; Schoch & Desojo, 2016 : fig. 4). New unusually-designed squamosal (described as “sword-like” having A beneficial. ferratus because of the Schoch, 2007 ) variations this new posterodorsal margin of one’s supratemporal fenestra. T. ruthae also has an effective sideways dependent squamosal; yet not, Roentgen. callenderi and you can aetosaurs lack the noticable ventral projection included in one to taxon (Ezcurra mais aussi al., 2017 ).
New squamosal contains about three process, an enthusiastic prior processes, a beneficial posterodorsal procedure, and you will a posteroventral processes. The newest mediolaterally narrow anterior procedure ‘s the prominent of your own about three and you can articulates ventrally to your quadratojugal, models a little part of the posterodorsal margin of horizontal temporal fenestra, and articulates dorsally into posteroventral side of the brand new postorbital. A lateral ridge for the dorsal part of the squamosal bounds the fresh supratemporal fenestra sideways and you may goes on anteriorly onto the dorsolateral margin of the postorbital. A small anteriorly leading top of one’s prior procedure of the newest squamosal underlies a great posterodorsal projecting prong of your own dorsal process of the new jugal. It contact excludes the fresh postorbital of participation regarding margin off the latest infratemporal fenestra as mentioned prior to now, just like the symptom in P. kirkpatricki (Weinbaum, 2011 ), and other from the condition in aetosaurs (e.g., P. andressorum, Schoch & Desojo, 2016 ). A tiny slot towards anteroventral surface of one’s anterior techniques matches a thinner dorsal process of the quadratojugal.
The new posterior part of the squamosal extends rear on direct of quadrate and divides toward good posteroventral and you can an anterodorsal processes. The head of your own quadrate matches for the a distinct ventrally up against fossa that offers onto the prior an element of the posteroventral techniques (Contour 4v); ergo, the posteroventral process and lateral side of the latest articulation skin covers the head of your quadrate off lateral examine. As well, on datingranking.net/tr/alt-inceleme/ posteroventral osal, there is certainly an apartment, posteriorly facing shelf you to definitely welcomes the narrow anterodorsal margin of your quadrate. The new rear surface of one’s posteroventral techniques enjoys a small facet you to articulates on paroccipital procedure of the newest opisthotic (Profile 4v). As opposed to really archosauriforms, it part was thickened mediolaterally and round towards a manhood similar towards condition in T. dabanensis (IVPP V3237) and aetosaurs (Nesbitt, 2011 ). The new posterodorsal process carries a slit on the its posterior edge one to matches the newest posterolateral procedure of the newest parietal.
Among the skeleton of one’s palate, the fresh vomers commonly recognized off people recognized specimen. Yet not, the latest ectopterygoid, pterygoid, and palatine was kept for the PEFO 34561 and you will an extra ectopterygoid known (PEFO 33857); the brand new palate is finished but obscured inside the PEFO 34089 (Profile 3d).
5.2.14 Pterygoid
No matter if not one are completely kept (Contour 5a), the latest pterygoid consists of the anterior procedure, horizontal process, and you may rear techniques. The new prior processes is actually triangular in the cross-point that have a large dorsal ridge one to distills the latest element during the the brand new midline. The ventral skin associated with procedure was concave. They tapers anteriorly although experience of this new palatine try unknown. The new lateral processes includes good posteriorly directed side that mountains posteroventrally. This new horizontal portion of the ventral facial skin features a huge part across the whole length of brand new horizontal process that articulates having the latest dorsal facial skin of the ectopterygoid (Shape 5a). Brand new pterygoid body’s a finer, vertically based blade. Brand new ventral epidermis bears a circular anteroposteriorly founded ridge one continues on onto the prior processes. Pterygoid teeth try absent. The rear techniques (= quadrate processes) is broken in all the specimens (elizabeth.g., PEFO 34561) rear into articulation area into the semi-round fossa with the basipterygoid procedure of the parabasisphenoid. The fresh anteroposterior amount of the newest pterygoid is much like you to in archosauriforms particularly Erythrosuchus africanus (Gower, 2003 ) and you may P. kirkpatricki (TTU P-9000), rather than the anteroposteriorly abbreviated pterygoids off aetosaurs (e.g., L. meadei, TMM 31185-98; Neoaetosauroides engaeus, PVL 5698).