The brand new ventral articular body bears one or two convex surfaces split up by the a great concave epidermis

The brand new ventral articular body bears one or two convex surfaces split up by the a great concave epidermis

5.dos.13 Squamosal

The brand new morphology and you will sideways facing direction of the squamosal is quite like aetosaurs including S. robertsoni, An excellent. ferratus, P. andressorum, and you can D. spurensis (Contour 4u, v; Walker, 1961 : fig. 2; Quick, 2002 : fig. 2; Schoch, 2007 : fig. 8; Schoch & Desojo, 2016 : fig. 4). New oddly-shaped squamosal (called “sword-like” getting A. ferratus by Schoch, 2007 ) forms the posterodorsal margin of your supratemporal fenestra. T. ruthae has a good laterally founded squamosal; although not, R. callenderi and you can aetosaurs lack the obvious ventral projection included in one to taxon (Ezcurra et al., 2017 ).

The fresh new squamosal holds about three techniques, a keen anterior processes, an effective posterodorsal processes, and a posteroventral techniques. The brand new mediolaterally narrow prior techniques ‘s the largest of your own around three and you will articulates ventrally on the quadratojugal, forms a little part of the posterodorsal margin of the lateral temporal fenestra, and you can articulates dorsally on the posteroventral side of the brand new postorbital. A lateral ridge with the dorsal portion of the squamosal bounds this new supratemporal fenestra sideways and you will goes on anteriorly onto the dorsolateral margin of your own postorbital. A tiny anteriorly pointing apex of your own prior process of the brand new squamosal underlies good posterodorsal projecting prong of the dorsal procedure of the brand new jugal. That it contact excludes new postorbital from involvement regarding margin regarding the infratemporal fenestra as mentioned in past times, just as the symptom in P. kirkpatricki (Weinbaum, 2011 ), and various from the symptom in aetosaurs (elizabeth.g., P. andressorum, Schoch & Desojo, 2016 ). A tiny slot towards the anteroventral facial skin of the prior procedure suits a thinner dorsal procedure of brand new quadratojugal.

The fresh posterior part of the squamosal expands posterior with the lead of your quadrate and splits with the an effective posteroventral and you may an enthusiastic anterodorsal processes. Your head of one’s quadrate suits to your a distinct ventrally facing fossa one to offers on the anterior a portion of the posteroventral process (Figure 4v); hence, the fresh new posteroventral procedure in addition to horizontal side of the fresh new articulation surface covers your head of your quadrate of lateral have a look at. On top of that, into the posteroventral osal, you will find an apartment, posteriorly facing shelf one allows brand new slim anterodorsal margin of quadrate. The latest rear facial skin of your posteroventral process have a little element one to articulates on paroccipital procedure for the fresh opisthotic (Figure 4v). In the place of most archosauriforms, this element is actually thickened mediolaterally and you can game toward a penis equivalent on symptom in T. dabanensis (IVPP V3237) and you can aetosaurs (Nesbitt, 2011 ). The latest posterodorsal procedure holds a beneficial slit towards their posterior border you to definitely matches the latest posterolateral process of this new parietal.

One of many bones of your palate, the vomers aren’t recognized out of people identified sample. However, the brand new ectopterygoid, pterygoid, and you will palatine are maintained in the PEFO 34561 and you will an additional ectopterygoid is known (PEFO 33857); the latest palate is finished but blurred from inside the PEFO 34089 (Profile 3d).

5.2.fourteen Pterygoid

Though not one are entirely managed (Profile 5a), new pterygoid consists of the brand new prior process, lateral procedure, and you may posterior processes. Brand new chinalovecupid kullanД±cД± adД± prior processes is actually triangular in cross-section having a taller dorsal ridge one to distills this new element during the the newest midline. The fresh ventral surface associated with process is concave. They tapers anteriorly although connection with brand new palatine try unfamiliar. The new lateral procedure contains a posteriorly pointed wing you to hills posteroventrally. Brand new horizontal portion of the ventral skin and has now an enormous factors along the entire amount of the new horizontal procedure that articulates with the dorsal skin of ectopterygoid (Profile 5a). The fresh new pterygoid body’s a thinner, vertically situated knife. New ventral body bears a rounded anteroposteriorly depending ridge you to definitely goes on on the anterior techniques. Pterygoid white teeth is actually missing. The brand new posterior procedure (= quadrate procedure) was broken-in all specimens (e.grams., PEFO 34561) posterior towards articulation point towards semi-rounded fossa with the basipterygoid procedure of the brand new parabasisphenoid. Brand new anteroposterior period of the pterygoid is much like one during the archosauriforms such as for example Erythrosuchus africanus (Gower, 2003 ) and you will P. kirkpatricki (TTU P-9000), as opposed to the anteroposteriorly abbreviated pterygoids regarding aetosaurs (age.grams., L. meadei, TMM 31185-98; Neoaetosauroides engaeus, PVL 5698).

Hai bisogno di aiuto?