The newest ventral articular facial skin contains two convex counters split of the an effective concave surface

17 August 22

The newest ventral articular facial skin contains two convex counters split of the an effective concave surface

5.dos.13 Squamosal

The latest morphology and you can sideways facing direction of your squamosal may be very similar to that of aetosaurs such as for example S. robertsoni, A. ferratus, P. andressorum, and you may D. spurensis (Profile 4u, v; Walker, 1961 : fig. 2; Quick, 2002 : fig. 2; Schoch, 2007 : fig. 8; Schoch & Desojo, 2016 : fig. 4). Brand new oddly-designed squamosal (described as “sword-like” to possess A beneficial. ferratus by Schoch, 2007 ) versions new posterodorsal margin of supratemporal fenestra. T. ruthae is served by a great sideways built squamosal; yet not, Roentgen. callenderi and you may aetosaurs lack the obvious ventral projection utilized in you to taxon (Ezcurra ainsi que al., 2017 ).

The new squamosal contains three processes, an enthusiastic anterior procedure, an effective posterodorsal procedure, and you may an excellent posteroventral techniques. The newest mediolaterally slim prior techniques ‘s the biggest of around three and articulates ventrally for the quadratojugal, variations a tiny part of the posterodorsal margin of the lateral temporary fenestra, and you will articulates dorsally to the posteroventral side of the brand new postorbital. A horizontal ridge on the dorsal portion of the squamosal bounds this new supratemporal fenestra laterally and you will continues anteriorly on the dorsolateral margin of your own postorbital. A small anteriorly pointing apex of anterior procedure for new squamosal underlies a good posterodorsal projecting prong of your dorsal process of the newest jugal. So it get in touch with excludes brand new postorbital out-of contribution regarding margin away from brand new infratemporal fenestra as previously mentioned prior to now, similar to the condition in P. kirkpatricki (Weinbaum, 2011 ), and different in the symptom in aetosaurs (e.grams., P. andressorum, Schoch & Desojo, 2016 ). A tiny position towards the anteroventral facial skin of one’s prior processes fits a thinner dorsal process of the newest quadratojugal.

The brand new rear part of the squamosal stretches rear into head of your quadrate and you will divides into a beneficial posteroventral and you can an enthusiastic anterodorsal processes. The head of the quadrate fits with the a definite ventrally facing fossa you to definitely extends onto the anterior part of the posteroventral procedure (Shape 4v); ergo, the new posteroventral procedure together with lateral edge of the articulation facial skin hides your head of one’s quadrate out of horizontal glance at. Additionally, to your posteroventral osal, there is certainly a flat, posteriorly against bookshelf one to welcomes the newest narrow anterodorsal margin of the quadrate. This new rear facial skin of your own posteroventral techniques provides a small facet you to definitely articulates for the paroccipital process of brand new opisthotic (Contour 4v). In place of most archosauriforms, this factors are thickened mediolaterally and you will round towards a penis similar towards symptom in T. dabanensis (IVPP V3237) and aetosaurs (Nesbitt, 2011 ). The newest posterodorsal procedure bears an effective slit for the the posterior edge one matches brand new posterolateral procedure for this new parietal.

One of the bones of your own palate, the newest vomers commonly approved away from any recognized specimen. Although not, this new ectopterygoid, pterygoid, and you can palatine was maintained when you look at the PEFO 34561 and you may an additional ectopterygoid is famous (PEFO 33857); the palate is finished but blurry inside the PEFO 34089 (Figure three dimensional).

5.dos.fourteen Pterygoid

Although not one are entirely kept (Figure 5a), the new pterygoid contains this new prior processes, horizontal processes, and you will posterior processes. The newest prior process is triangular when you look at the mix-area that have a large dorsal ridge one delineates the feature at the the fresh new midline. The latest ventral epidermis of this procedure is concave. It tapers anteriorly nevertheless the connection with the brand new palatine was unknown. The fresh new lateral processes consists of an excellent posteriorly directed wing you to hills posteroventrally. The latest horizontal part of the ventral body features a giant part over the whole length of the newest lateral procedure that articulates which have the brand new dorsal facial skin of your own ectopterygoid (Shape 5a). The newest pterygoid person is a slimmer, vertically dependent knife. The new ventral surface holds a bent anteroposteriorly centered ridge you to definitely goes on onto the anterior process. Pterygoid teeth was missing. The rear techniques (= quadrate process) are broken-in all of the specimens (e.grams., PEFO 34561) posterior towards the articulation part into partial-rounded fossa into the basipterygoid process of the latest parabasisphenoid. The latest anteroposterior length of new pterygoid is a lot like you to inside archosauriforms instance Erythrosuchus africanus (Gower, 2003 ) and you will P. kirkpatricki (TTU P-9000), instead of the anteroposteriorly abbreviated pterygoids out of aetosaurs (e, L. meadei, TMM 31185-98; Neoaetosauroides engaeus, PVL 5698).

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