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A small ridge to the posterodorsal margin of the dorsal processes articulates into the a slot to your anteroventral osal. Posterior to this there is certainly a low fossa which is overlapped by anterolateral edge of new quadrate. Brand new ventral idea of your fossa is the prior edging off the newest quadrate foramen. The brand new posteroventral spot of quadratojugal variations a continuing surface which have the horizontal portion of the quadrate, fitted toward an effective fossa to the horizontal margin of one’s second function. The brand new quadratojugal variations the brand new posteroventral spot of your lateral temporary fenestra during the R. callenderi.
Anteriorly, the fresh new tapering posterior means of this new jugal inserts with the a beneficial triangular slot on horizontal epidermis of quadratojugal (Contour 4o). This kind of articulation is also contained in P. kirkpatricki (TTU P-9002; Weinbaum, 2011 : fig. 13). An equivalent articulation design happens in A beneficial. ferratus and Paratypothorax andressorum (SMNS 19003; Schoch & Desojo, 2016 ), where a sub-triangular posterior process of the newest jugal inserts to your a keen embayment inside the new anteroventral margin of the quadratojugal ventral towards lateral temporal fenestra. On these taxa, a tiny anteroventral means of the newest quadratojugal underlaps brand new jugal (Schoch, 2007 ). A similar articulation also takes place in brand new doswelliid archosauriform Rugarhychos sixmilensis (Wynd mais aussi al., 2020 ) suggesting so it character county is plesiomorphic.
The newest postorbital is actually good triradiate bone which have an ornamented lateral body and you will about three collection of processes (Numbers 4q, r). The fresh anterodorsal process keeps a definite horizontal slot one receives the ventral and you can posterior part of the postfrontal, the newest posterodorsal process articulates on the anterodorsal osal, and the ventral techniques suits towards a slot with the anterior and you will medial surface of the posterodorsal means of this new jugal. The brand new dorsal margin try generally curved and has now a distinct ridge one models the brand new anterolateral margin of supratemporal fenestra. This new curved anterior margin have a weakened ridge, building the new posterodorsal margin of orbit. This new solid dorsal ridge, and that offers posteriorly on the squamosal, is not utilized in aetosaurs (age.grams., Desmatosuchus smalli, TTU P9024-; T. coccinarum, PEFO 38001). It is extremely most likely absent when you look at the A. geoffreyi (UCMP 156046), and that cannot maintain the newest postorbital, but has this new squamosal and lacks it ridge. D. grallator has an identical dorsal ridge towards the postorbital and you will squamosal (Sues et al., 2003 ).
Brand new anteroventral part of the squamosal and you may posterodorsal procedure for the fresh jugal almost suits over the posteroventral edge of the fresh new postorbital, almost excluding that it element of involvement in the horizontal temporal fenestra (Profile 3b). It close exception to this rule is not book to Roentgen. callenderi because and additionally takes place in P. kirkpatricki (Weinbaum, 2011 ), additionally the contribution may be very restricted for the aetosaurs (age.grams., An effective. ferratus) therefore the crocodylomorph D. grallator (Nesbitt, 2011 ; Schoch, 2007 ).
This new triangular element originally translated given that lacrimal by the Parker mais aussi al. ( 2005 : fig. 2) is simply a remote postorbital recovered to cougar life sД±navlarД± the head away from PEFO 33787. New prior part of the remaining squamosal when you look at the Parker ainsi que al. ( 2005 : fig. 2b) is largely a keen articulated postorbital.
New quadrate try kept from inside the PEFO 34561 (Contour 4s, t), therefore the quadrates is obscured inside PEFO 38609 (Rates 3c, d). The newest quadrate person is a stronger, dorsoventrally high bone that does not have fenestration and you can slopes posteroventrally, differing throughout the symptom in shuvosaurids and aetosaurs in which the quadrate hills anteroventrally (Nesbitt, 2007 ).
An intense dorsoventrally depending fossa is present posterolateral into lateral flange (Shape 4s). The fresh new pterygoid flange is not really-preserved within the PEFO 34561, although thickened base of the flange occurs on the right feature just dorsal into medial condyle over the medial border of one’s quadrate.