An excellent prearticular and you can coronoid haven’t been retrieved for R

5.step 3 Mandible

Nearly the whole mandible try represented in PEFO 34561 (Figures 5d–j) and PEFO 38609 (Shape three dimensional), along with one another articulars, angulars, surangulars, splenials, and dentaries. callenderi.

5.step 3.step one Dentary

Over dentaries exist during the PEFO 34561 (Figure 5d). White teeth are present into the anteriormost margin for instance the plesiomorphic position during the archosaurs and you can in place of new edentulous margin for the aetosaurs. Brand new dentary enamel matter may differ ranging from ten and you may blued nasД±l kullanД±lД±r 11. This new mesial-most alveoli feel the smallest diameter on function and are also some constricted labiolingually; the fresh alveolar diameters basically improve distally. For the dorsal glance at and you will carrying out mesially, this new enamel line contours medially so that it is lingual out of the fresh lateral wall of one’s dentary. Tooth root are exposed predominantly towards the lingual side of the mandible and interdental plates are present. At the least from the proper dentary out-of PEFO 34561, talking about bonded from the mesial alveoli.

Anteriorly the dentary tapers to help you a curved point in lateral take a look at (Shape 5d). The fresh new weakly create dentary symphysis forms a bent “mouth,” therefore the ventral margin of your own dentary is actually broadly rounded close the new symphysis; it becomes a crisper edge more posteriorly. Quick foramina safeguards the latest lateral facial skin of one’s prior portion, that reduced total of amount posteriorly. A row of such as for example high foramina happens close and you may synchronous in order to the newest dorsal margin; it is sometimes complicated to determine regardless of if these have a good one-to-you to definitely connection with this new alveoli.

The fresh medial body try excavated from the an excellent Meckelian groove one stretches to own a lot of the length of the brand new function (Contour 5d). The groove are highest and you can strongest posteriorly, where it covers almost the whole medial section of the dentary, and you may constricts anteriorly, to be a low groove at about this new 6th dentary enamel and you can upcoming entirely disappears during the 3rd or fourth alveolus.

Posteriorly, about three collection of tapering processes stretch beyond the posterior margin of one’s enamel line (Contour 5d). The latest central and you can dorsalmost processes articulate with type of grooves towards the anterolateral epidermis of surangular, whereas the reduced process suits towards the an excellent groove for the anterolateral epidermis of angular. One particular dorsal and you will main process class a keen anteriorly tapered sulcus on the lateral skin of your dentary one to held the brand new main prior techniques with the surangular (find below). The greater dorsal processes have one or two popular evident ridges to your horizontal facial skin; new dorsalmost a person is persisted with a lateral ridge on the surangular (see less than). The fresh new main processes discusses the or every area where the latest exterior mandibular fenestra is based in most other archosaurs; ergo, the brand new additional mandibular fenestra try smaller than average happen ventral on main processes.

5.3.2 Surangular

The fresh surangular forms the brand new dorsal area of the horizontal wall structure out-of the brand new hemimandible, and you will a great rugose ornamentation talks about the brand new lateral facial skin (Contour 5e). A-sharp ridge extends anteroposteriorly along side dorsolateral edge of this new lateral facial skin (= surangular ridge) of the surangular as in many other archosaurs, including phytosaurs, P. kirkpatricki, An effective. babbitti, and you may B. kupferzellensis (Gower, 1999 ; Nesbitt, 2005a , 2005b ; Stocker, 2012 ; Weinbaum, 2011 ).

This new prior edge of the latest surangular has around three anterior forecasts (Figure 5e). The brand new main projection ‘s the prominent and you will suits lateral in order to an anteriorly tapered sulcus involving the dorsal and central rear process toward the brand new dentary (see a lot more than). A-deep concavity within dorsal and central techniques of one’s surangular retains this new dorsal rear projection towards dentary. The more ventral prior procedure of the newest surangular is set further posteriorly across the ventral edge of brand new ability features a thin ventral flange that will was secure laterally from the angular.