5.2.10 Quadratojugal
Hook ridge on the posterodorsal margin of one’s dorsal processes articulates within the a slot with the anteroventral osal. Posterior compared to that there’s a low fossa which is overlapped because of the anterolateral side of the brand new quadrate. The latest ventral suggestion of your own fossa ‘s the anterior edging of this new quadrate foramen. The fresh new posteroventral spot of your own quadratojugal models a continuous body having the latest horizontal part of the quadrate, fitted on the a fossa towards lateral margin of your latter function. The brand new quadratojugal versions the latest posteroventral corner of your own lateral temporal fenestra during the Roentgen. callenderi.
Anteriorly, the newest tapered posterior means of the fresh jugal inserts for the a triangular position towards the lateral surface of quadratojugal (Figure 4o). This kind of articulation is additionally present in P. kirkpatricki (TTU P-9002; Weinbaum, 2011 : fig. 13). An equivalent articulation layout happens in Good. ferratus and you can Paratypothorax andressorum (SMNS 19003; Schoch & Desojo, 2016 ), where a sub-triangular rear procedure of the brand new jugal inserts to your a keen embayment inside the new anteroventral margin of the quadratojugal ventral on lateral temporary fenestra. Throughout these taxa, a tiny anteroventral means of the newest quadratojugal underlaps the fresh jugal (Schoch, 2007 ). A similar articulation as well as takes place in the new doswelliid archosauriform Rugarhychos sixmilensis (Wynd mais aussi al., 2020 ) suggesting so it character condition tends to be plesiomorphic.
5.2.11 Postorbital
New postorbital try a beneficial triradiate limbs having an ornamented lateral facial skin and you can three type of procedure (Figures 4q, r). Brand new anterodorsal procedure possess a definite horizontal position one receives the ventral and you can posterior part of the postfrontal, the fresh new posterodorsal procedure articulates towards the anterodorsal osal, additionally the ventral procedure fits into a slot with the anterior and you may medial surface of one’s posterodorsal means of the jugal. The newest dorsal margin try broadly rounded and it has a definite ridge you to definitely versions this new anterolateral margin of your own supratemporal fenestra. New curved prior margin features a weaker ridge, forming this new posterodorsal margin of one’s orbit. The fresh good dorsal ridge, and therefore offers posteriorly onto the squamosal, is not found in aetosaurs (e.g., Desmatosuchus smalli, TTU P9024-; T. coccinarum, PEFO 38001). It is also most likely absent within the An excellent. geoffreyi (UCMP 156046), which does not keep the new postorbital, however, comes with the brand new squamosal and lacks that it ridge. D. grallator features a similar dorsal ridge with the postorbital and squamosal (Sues et al., 2003 ).
The new anteroventral portion blackcupid eЕџleЕџme of the squamosal and you can posterodorsal process of the new jugal almost match along the posteroventral edge of the brand new postorbital, almost leaving out that it element of contribution regarding the horizontal temporal fenestra (Profile 3b). Which near exception is not book so you can Roentgen. callenderi because it plus happens in P. kirkpatricki (Weinbaum, 2011 ), plus the contribution is extremely limited when you look at the aetosaurs (elizabeth.g., A great. ferratus) and also the crocodylomorph D. grallator (Nesbitt, 2011 ; Schoch, 2007 ).
The newest triangular ability to start with translated just like the lacrimal from the Parker mais aussi al. ( 2005 : fig. 2) is basically a remote postorbital recovered to your head of PEFO 33787. The brand new prior portion of the left squamosal within the Parker mais aussi al. ( 2005 : fig. 2b) is actually a keen articulated postorbital.
5.dos.several Quadrate
This new quadrate was kept when you look at the PEFO 34561 (Contour 4s, t), together with quadrates are obscured inside the PEFO 38609 (Rates 3c, d). The fresh quadrate body is a solid, dorsoventrally extreme limbs you to definitely lacks fenestration and you can slopes posteroventrally, different on condition in shuvosaurids and you may aetosaurs where in actuality the quadrate slopes anteroventrally (Nesbitt, 2007 ).
A deep dorsoventrally oriented fossa exists posterolateral to your horizontal flange (Contour 4s). The brand new pterygoid flange is not well-maintained in the PEFO 34561, but the thickened foot of the flange occurs to the right function simply dorsal to the medial condyle over the medial border of quadrate.