5.seven.several Tibia
The newest proximal direct of your own tibia is a lot stretched much like aetosaurs; Parrish ( 1986 ) suggested the stretched tibial lead could be good synapomorphy from the aetosaurs. Such as aetosaur tibiae, the brand new proximal body of the tibia during the Roentgen. callenderi is split because of the a beneficial ridge to your a couple of equivalent sized a bit concave medial and you will horizontal condyles (Figures 10l–o). The proximal surfaces of your own medial and you can lateral condyles are concave, and you may a distinct lip is present where in actuality the one or two condyles see. New proximal head of the tibia is significantly offered mediolaterally cousin on the diameter of one’s axle with the ideal extension medially (Contour 10n). The new axle was subrounded from inside the cross section. The fresh new tibia duration is approximately one or two-thirds the size of the new femur (Data S2). A vertical ridge is on posterolateral side of the shaft.
The fresh new distal prevent is also mediolaterally prolonged not because the firmly because the proximal stop and you can firmly resembles the fresh suchian status (Shape 10o). New medial portion of the articular epidermis ideas distally which can be convex. The new horizontal part try quicker distally longer along the posterior line and you may an excellent posterior groove splits the two articulation surfaces.
5.eight.thirteen Fibula
Within the PEFO 34561, the new fibula is pretty straight (Figures 10p–s), different regarding that aetosaurians, which have an obvious “kink” (age.g., Letter. engaeus; PVL 3525; L. meadei, TTM 31185-97). The new proximal end was anteroposteriorly expanded and rounded within the proximal examine. The small, round iliofibularis crest is positioned one-3rd the length distally in the lateral surface of your axle (Contour 10p). The outside surface is simple, scarcely higher than the surface of the shaft varying regarding much more pronounced rugose crest used in aetosaurs (Parrish, 1986 ) that is so much more distally arranged. The fresh new distal stop is mediolaterally compressed and you can extended anteroposteriorly in line with the latest shaft. This new distal articular facial skin try easy and you can beveled anteromedially as with phytosaurs (elizabeth.g., UCMP 122621).
5.seven.fourteen Astragalus
The new astragalus (Figures 11a–f) is like compared to other suchians (elizabeth.grams., aetosaurs). In the prior see, a massive anterior hollow takes up much of brand new prior surface (Shape 11a). https://datingranking.net/tr/adultspace-inceleme/ This new tibial and you will fibular counters satisfy from the an optimum within the anterior examine. Posteriorly, the new astragalar peg (Shape 11b) is obtainable into posterodistal skin only ventral towards the distolaterally trending posterior groove. New astragalar peg possess a great mediolateral length on the twice the new anteroposterior height of the ability. The fresh posterodistal skin of your peg enjoys a shallow department, however, that it division isn’t mirrored because an excellent ridge into the expressing facial skin of the calcaneum. Brand new fibular aspect of the astragalus was concave and you can subrectangular (Shape 11e). New tibial articular part (Shape 11c) try split into a few concave countries that have a little convex city splitting up a smaller horizontal articular epidermis and a much bigger medial articular body. The larger facial skin articulates into ventral procedure for the brand new tibia. Small articular surface is found toward whole dorsal skin of your own fibular process. A thinner ridge distinguishes new tibial and you can fibular aspects. The latest distal roller is actually convex and you may is similar to that from almost every other suchians (come across Sereno, 1991 ; Nesbitt, 2011 ).
5.eight.fifteen Calcaneum
The new calcaneum (Numbers 11g–l) is similar to that of very very early suchians (elizabeth.grams., aetosaurs). The brand new hemicylindrical articular body was split by the an anteroposteriorly trending ridge to your fibular aspect and you will astragalar element. The fresh new astragalar factors is entirely medial towards fibular part, rather than the problem inside the Age. okeeffeae (AMNH FR 30857), P. kirkpatricki (elizabeth.grams., TTU-P 9002), and crocodylomorphs (e.g., “H. agilis” YPM 41198), where in fact the astragalar facet is situated far more ventrally (Nesbitt, 2011 ). New concave outlet toward astragalar peg (Figure 11h) will not penetrate the newest medial wall of your own hemicylindrical articular body. The latest calcaneal tuber is actually directed posteriorly in that way away from nearly all early suchians. This new calcaneal tuber is actually mediolaterally longer and prolonged dorsal and you may some on ventral direction (Profile 11k). The fresh new tuber doesn’t always have an enthusiastic anteroposteriorly based groove such as P. kirkpatricki (e.g., TTU P-9002) and you will crocodylomorphs (elizabeth.grams., “H. agilis,” YPM 41198). As an alternative, the fresh posterior surface try concave such as aetosaurs (age.grams., Typothorax antiquum; Lucas mais aussi al., 2002 ). This new ventral skin holds an excellent concave fossa. The articulation town towards the distal tarsal 4 is actually significantly concave and not flat like in phytosaurs or any other suchians (Much time & Murry, 1995 ).