Brand new ventral articular body carries one or two convex counters separated from the a beneficial concave surface

Brand new ventral articular body carries one or two convex counters separated from the a beneficial concave surface

5.dos.thirteen Squamosal

The newest morphology and sideways facing direction of one’s squamosal is extremely like aetosaurs particularly S. robertsoni, Good. ferratus, P. andressorum, and you can D. spurensis (Profile 4u, v; Walker, 1961 : fig. 2; Brief, 2002 : fig. 2; Schoch, 2007 : fig. 8; Schoch & Desojo, 2016 : fig. 4). The fresh new unusually-molded squamosal (known as “sword-like” for An excellent. ferratus because of the Schoch, 2007 ) forms new posterodorsal margin of the supratemporal fenestra. T. ruthae comes with a laterally mainly based squamosal; however, Roentgen. callenderi and you will aetosaurs do not have the pronounced ventral projection included in that taxon (Ezcurra ainsi que al., 2017 ).

This new squamosal contains three procedure, a keen prior techniques, an effective posterodorsal techniques, and a great posteroventral procedure. The fresh mediolaterally slim prior processes is the premier of about three and you may articulates ventrally on the quadratojugal, variations a small part of the posterodorsal margin of one’s horizontal temporal fenestra, and you will articulates dorsally toward posteroventral side of the fresh new postorbital. A lateral ridge into dorsal portion of the squamosal bounds the brand new supratemporal fenestra laterally and goes on anteriorly on the dorsolateral margin of postorbital. A small anteriorly leading top of one’s anterior means of the new squamosal underlies an effective posterodorsal projecting prong of the dorsal process of the newest jugal. This get in touch with excludes the newest postorbital away from contribution about margin off new infratemporal fenestra as mentioned previously, similar to the symptom in P. kirkpatricki (Weinbaum, 2011 ), and various on symptom in aetosaurs (elizabeth.grams., P. andressorum, Schoch & Desojo, 2016 ). A little slot toward anteroventral epidermis of one’s anterior techniques fits a slimmer dorsal means of the fresh new quadratojugal.

New rear part of the squamosal offers rear into head of your own quadrate and you will splits on the a beneficial posteroventral and you can an enthusiastic anterodorsal processes. Your mind of the quadrate matches on a definite ventrally up against fossa that expands onto the anterior the main posteroventral techniques (Figure 4v); for this reason, this new posteroventral process plus the lateral edge of the new articulation epidermis covers your mind of one’s quadrate away from lateral view. Simultaneously, on posteroventral osal, you will find a condo, posteriorly facing bookshelf one to allows brand new narrow anterodorsal margin of your own quadrate. Brand new posterior facial skin of the posteroventral procedure have a tiny aspect that articulates towards the paroccipital procedure of this new opisthotic (Contour 4v). In place of most archosauriforms, so it facet are thickened mediolaterally and game towards a cock comparable toward symptom in T. dabanensis (IVPP V3237) and aetosaurs (Nesbitt, 2011 ). The fresh posterodorsal techniques contains a great slit on the the rear boundary you to definitely matches the brand new posterolateral process of the fresh parietal.

Among the bones of one’s palate, the fresh vomers are not recognized from any identified sample. However, the brand new ectopterygoid, pterygoid, and you may palatine is preserved in the PEFO 34561 and you may an extra ectopterygoid is known (PEFO 33857); the new palate is finished however, blurry in PEFO 34089 (Figure three-dimensional).

5.dos.fourteen Pterygoid

Even though none are entirely managed (Shape 5a), the fresh new pterygoid consists of new anterior processes, horizontal procedure, and you will posterior processes. Brand new prior process try triangular for the cross-part with a large dorsal ridge you to spells out this new feature during the this new midline. The latest ventral body of this procedure is actually concave. It tapers anteriorly although connection with brand new palatine is actually unknown. New horizontal techniques contains good posteriorly indicated wing you to definitely mountains posteroventrally. Brand new horizontal portion of the ventral body and has now an enormous element along side whole length of new lateral process that articulates with the fresh dorsal surface of one’s ectopterygoid (Contour 5a). The new pterygoid person is a thinner, vertically established blade. The brand new ventral skin contains a rounded anteroposteriorly based ridge one continues onto the anterior processes. Pterygoid teeth are missing. The newest rear techniques (= quadrate techniques) are broken-in all of the specimens (age.g., PEFO 34561) posterior into the articulation area to your semi-circular fossa on basipterygoid procedure for the parabasisphenoid. The fresh anteroposterior amount of this new pterygoid is like one to inside the archosauriforms such as for example Erythrosuchus africanus (Gower, 2003 ) and you may P. kirkpatricki (TTU P-9000), instead of the anteroposteriorly abbreviated pterygoids off aetosaurs (age.grams., L. meadei, TMM 31185-98; Neoaetosauroides engaeus, PVL 5698).

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