Pertubuhan Mahasiswa Istimewa | PERMAI | PPM-024-02-12122017

The fresh ventral articular surface holds one or two convex surfaces split up because of the a great concave facial skin

5.2.13 Squamosal

The newest morphology and you may laterally facing positioning of the squamosal may be very like aetosaurs such S. robertsoni, A great. ferratus, P. andressorum, and D. spurensis (Figure 4u, v; Walker, 1961 : fig. 2; Small, 2002 : fig. 2; Schoch, 2007 : fig. 8; Schoch & Desojo, 2016 : fig. 4). This new strangely-molded squamosal (referred to as “sword-like” having A. ferratus by Schoch, 2007 ) versions this new posterodorsal margin of the supratemporal fenestra. T. ruthae even offers an effective laterally based squamosal; not, R. callenderi and aetosaurs do not have the pronounced ventral projection used in that taxon (Ezcurra ainsi que al., 2017 ).

The fresh squamosal contains three procedure, a keen prior procedure, an excellent posterodorsal process, and you will good posteroventral processes. The new mediolaterally thin anterior process ‘s the prominent of one’s about three and you may articulates ventrally to the quadratojugal, variations a little portion of the posterodorsal margin of the lateral temporal fenestra, and you will articulates dorsally towards posteroventral side of the fresh new postorbital. A lateral ridge toward dorsal part of the squamosal bounds brand new supratemporal fenestra sideways and you will goes on anteriorly on the dorsolateral margin of postorbital. A tiny anteriorly pointing top of your prior procedure of the newest squamosal underlies a good posterodorsal projecting prong of your own dorsal procedure for new jugal. This get in touch with excludes the brand new postorbital away from involvement on the margin out-of this new infratemporal fenestra as mentioned in earlier times, just like the symptom in P. kirkpatricki (Weinbaum, 2011 ), and differing in the symptom in aetosaurs (e.grams., P. andressorum, Schoch & Desojo, 2016 ). A little position towards the anteroventral surface of one’s anterior procedure fits a finer dorsal procedure for new quadratojugal.

The latest posterior portion of the squamosal runs posterior towards the head of one’s quadrate and you may splits on an excellent posteroventral and you will an enthusiastic anterodorsal techniques. The head of your quadrate suits to the a definite ventrally against fossa one expands on the prior the main posteroventral techniques (Figure 4v); thus, new posteroventral processes therefore the horizontal edge of the brand new articulation body hides your face of one’s quadrate out-of horizontal take a look at. On the other hand, on the posteroventral osal, discover an apartment, posteriorly facing shelf one accepts the newest thin anterodorsal margin of the quadrate. The latest rear facial skin of the posteroventral processes has actually a small element that articulates on paroccipital procedure of new opisthotic (Profile 4v). In the place of very archosauriforms, so it aspect try thickened mediolaterally and you may rounded for the a cock similar to the condition in T. dabanensis (IVPP V3237) and you can aetosaurs (Nesbitt, 2011 ). The fresh new posterodorsal techniques carries a beneficial slit for the their posterior border that fits the newest posterolateral adultspace nedir procedure of this new parietal.

One of many skeleton of the palate, new vomers aren’t approved of one identified sample. But not, this new ectopterygoid, pterygoid, and palatine try kept inside the PEFO 34561 and you can an extra ectopterygoid known (PEFO 33857); the fresh palate is finished however, blurred for the PEFO 34089 (Shape three-dimensional).

5.dos.14 Pterygoid

Even if not one are entirely maintained (Shape 5a), brand new pterygoid includes the brand new prior techniques, lateral procedure, and you may rear processes. The newest prior procedure is actually triangular when you look at the cross-point having a tall dorsal ridge one to delineates the feature from the brand new midline. This new ventral epidermis of this process is actually concave. They tapers anteriorly although exposure to the fresh new palatine was unfamiliar. The horizontal techniques contains a posteriorly indicated side one to slopes posteroventrally. New horizontal portion of the ventral body and it has a huge aspect over the entire amount of the new lateral procedure that articulates with brand new dorsal surface of your ectopterygoid (Figure 5a). The latest pterygoid body is a finer, vertically mainly based knife. The latest ventral epidermis contains a bent anteroposteriorly founded ridge that continues on on the prior procedure. Pterygoid white teeth is actually missing. The fresh new rear processes (= quadrate process) try broken in all the specimens (elizabeth.grams., PEFO 34561) posterior for the articulation point into semi-circular fossa on the basipterygoid procedure for the newest parabasisphenoid. The latest anteroposterior duration of brand new pterygoid is a lot like that into the archosauriforms instance Erythrosuchus africanus (Gower, 2003 ) and you can P. kirkpatricki (TTU P-9000), as opposed to the anteroposteriorly abbreviated pterygoids regarding aetosaurs (age.g., L. meadei, TMM 31185-98; Neoaetosauroides engaeus, PVL 5698).


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