The fresh proximal lead of the tibia is significantly lengthened much like aetosaurs; Parrish ( 1986 ) suggested that prolonged tibial direct can be good synapomorphy away from new aetosaurs. Such as for example aetosaur tibiae, the brand new proximal epidermis of tibia in the Roentgen. callenderi is split up of the a ridge into two equal size of somewhat concave medial and you can horizontal condyles (Data 10l–o). The brand new proximal surfaces of the medial and you can horizontal condyles are concave, and you may a distinct lip is obtainable where in fact the a couple of condyles fulfill. The brand new proximal head of one’s tibia are greatly longer mediolaterally relative towards diameter of your own shaft into finest extension medially (Shape 10n). The brand new axle was subrounded inside the cross section. The new tibia size is approximately a couple of-thirds the size of the newest femur (Studies S2). A vertical ridge is based to your posterolateral side of the axle.
The brand new distal end is also mediolaterally lengthened but not once the strongly just like the proximal stop and you can strongly is much like the fresh new suchian status (Shape 10o). The new medial part of the articular body strategies distally which is convex. The fresh new horizontal bit try faster distally offered with each other their posterior edge and a great rear groove divides both articulation surfaces.
When you look at the PEFO 34561, the new fibula is quite upright (Numbers 10p–s), differing regarding that aetosaurians, that have an obvious “kink” (e.grams., N. engaeus; PVL 3525; L. meadei, TTM 31185-97). The fresh new proximal prevent was anteroposteriorly stretched and you will game from inside the proximal see. The small, circular iliofibularis crest is you to definitely-third the distance distally on the lateral facial skin of the axle (Profile 10p). Its exterior body try easy, scarcely more than the top of axle differing in the even more noticable rugose crest included in aetosaurs (Parrish, 1986 ) that is a lot more distally organized. This new distal stop is mediolaterally compressed and you can longer anteroposteriorly according to the shaft. The fresh new distal articular epidermis was easy and you can beveled anteromedially like in phytosaurs (age.g., UCMP 122621).
The fresh astragalus (Data 11a–f) is similar to regarding other suchians (e.g., aetosaurs). For the anterior take a look at, an enormous prior empty uses up most of the fresh prior skin (Figure 11a). The new tibial and fibular surfaces fulfill in the a peak when you look at the prior glance at. Posteriorly, the latest astragalar peg (Shape 11b) can be acquired into the posterodistal facial skin merely ventral towards the distolaterally trending rear groove. The brand new astragalar peg enjoys good mediolateral size in the double the fresh new anteroposterior peak of ability. The brand new posterodistal body of peg have a low office, however, that it division is not shown given that a ridge on the articulating facial skin of calcaneum. The fibular aspect of the astragalus was concave and you will subrectangular (Contour 11e). The latest tibial articular facet (Profile 11c) try divided in to two concave places that have a tiny convex urban area breaking up a smaller horizontal articular body and you may more substantial medial articular epidermis. The bigger epidermis articulates into the ventral procedure for the brand new tibia. The smaller articular surface is situated into the whole dorsal surface of your own fibular techniques. A thinner ridge sets apart the latest tibial and you will fibular factors. The fresh new distal roller is convex and you can is much like that from other suchians (see Sereno, 1991 ; Nesbitt, 2011 ).
The latest calcaneum (Rates 11g–l) is generally similar to that of very early suchians (e.grams., aetosaurs). The new hemicylindrical articular facial skin try divided of the a keen anteroposteriorly trending ridge with the fibular aspect and you will astragalar element. The latest astragalar part is completely medial with the fibular element, instead of the problem into the Elizabeth. okeeffeae (AMNH FR 30857), P. kirkpatricki (age.grams., TTU-P 9002), and crocodylomorphs (age.g., “H. agilis” YPM 41198), where in actuality the astragalar part is so much more ventrally (Nesbitt, 2011 ). The newest concave outlet with the astragalar peg (Profile 11h) will not penetrate this new medial wall surface of your own hemicylindrical articular epidermis. The new calcaneal tuber are led posteriorly in that way out of quite a few of early suchians. Brand new calcaneal tuber is actually mediolaterally stretched and you can longer dorsal and slightly regarding the ventral recommendations (Shape 11k). The new tuber does not have a keen anteroposteriorly based groove as in P. kirkpatricki (elizabeth.grams., TTU P-9002) and you may crocodylomorphs (e.grams., “H. agilis,” YPM 41198). Instead, the brand new posterior facial skin try concave such as aetosaurs (elizabeth.grams., Typothorax antiquum; Lucas ainsi que al., 2002 ). This new ventral surface carries a beneficial concave fossa. Brand new articulation urban area towards distal tarsal 4 was significantly concave and not alua ekЕџi flat like in phytosaurs and other suchians (A lot of time & Murry, 1995 ).