5.seven.several Tibia

New proximal head of one’s tibia is a lot offered much like aetosaurs; Parrish ( 1986 ) ideal that the stretched tibial head could be an effective synapomorphy regarding the fresh new aetosaurs. Particularly aetosaur tibiae, brand new proximal epidermis of one’s tibia inside the Roentgen. callenderi try split by the a good ridge into the a few equal measurements of a bit concave medial and you may horizontal condyles (Rates 10l–o). The fresh proximal counters of one’s medial and you may horizontal condyles try concave, and you will a distinct lip is available where in actuality the a few condyles fulfill. The fresh new proximal direct of the tibia are considerably lengthened mediolaterally cousin for the diameter of the shaft into the better extension medially (Shape 10n). Brand new shaft are subrounded from inside the cross section. The newest tibia size is roughly a few-thirds the size of the brand new femur (Data S2). A vertical ridge is situated to the posterolateral region of the shaft.

New distal stop is also mediolaterally longer yet not once the firmly once the proximal avoid and you will firmly is similar to new suchian standing (Shape 10o). The fresh medial part of the articular body methods distally in fact it is convex. The brand new horizontal piece is faster distally expanded along their rear border and a good rear groove splits the 2 articulation surfaces.

5.eight.thirteen Fibula

During the PEFO 34561, the latest fibula is pretty straight (Rates 10p–s), differing out of that aetosaurians, with a noticable “kink” (e.grams., Letter. engaeus; PVL 3525; L. meadei, TTM 31185-97). This new proximal stop was anteroposteriorly lengthened and you can round during the proximal evaluate. The tiny, round iliofibularis crest is you to-third the length distally regarding the lateral facial skin of your axle (Figure 10p). The external surface try easy, hardly higher than the top of axle differing on the way more pronounced rugose crest utilized in aetosaurs (Parrish, 1986 ) that’s significantly more distally positioned. The latest distal avoid was mediolaterally compacted and you may expanded anteroposteriorly relative to the latest shaft. The distal articular body are simple and beveled anteromedially such as phytosaurs (age.grams., UCMP 122621).

5.eight.fourteen Astragalus

Brand new astragalus (Rates 11a–f) is like regarding most other suchians (elizabeth.grams., aetosaurs). Within the anterior view, a giant anterior hollow occupies most of the newest anterior surface (Profile 11a). The newest tibial and you may fibular surfaces see during the a highest in anterior examine. Posteriorly, the new astragalar peg (Profile 11b) is obtainable on the posterodistal body simply ventral on distolaterally trending posterior groove. This new astragalar peg possess good mediolateral size regarding the twice the newest anteroposterior level of your own function. Brand new posterodistal facial skin of the peg provides a superficial division, but this department is not mirrored given that a ridge to your expressing skin of your own calcaneum. The latest fibular facet of the astragalus try concave and you will subrectangular (Contour 11e). The fresh tibial articular factors (Contour 11c) are divided into two concave nations which have a little convex area splitting up a smaller lateral articular epidermis and you will a bigger medial articular surface. The bigger facial skin articulates toward ventral means of this new tibia. Small articular facial skin is found into the entire dorsal surface of your own fibular processes. A thinner ridge separates the new tibial be2 beДџenenleri gГ¶rme and you can fibular issues. New distal roller is actually convex and is much like those of almost every other suchians (look for Sereno, 1991 ; Nesbitt, 2011 ).

5.eight.15 Calcaneum

The newest calcaneum (Numbers 11g–l) tends to be similar to that of extremely very early suchians (e.g., aetosaurs). This new hemicylindrical articular epidermis is split by the a keen anteroposteriorly trending ridge on the fibular element and astragalar part. The astragalar element is completely medial on the fibular aspect, rather than the challenge into the Elizabeth. okeeffeae (AMNH FR 30857), P. kirkpatricki (age.grams., TTU-P 9002), and crocodylomorphs (age.grams., “H. agilis” YPM 41198), the spot where the astragalar part is located even more ventrally (Nesbitt, 2011 ). The fresh concave socket for the astragalar peg (Profile 11h) does not penetrate the fresh new medial wall of hemicylindrical articular body. The fresh calcaneal tuber try brought posteriorly in that way out-of many of early suchians. This new calcaneal tuber was mediolaterally extended and extended dorsal and some about ventral direction (Contour 11k). This new tuber doesn’t have an anteroposteriorly built groove as with P. kirkpatricki (e.grams., TTU P-9002) and you can crocodylomorphs (e.grams., “H. agilis,” YPM 41198). Alternatively, the fresh new rear epidermis is concave as with aetosaurs (e.g., Typothorax antiquum; Lucas ainsi que al., 2002 ). The newest ventral facial skin carries an effective concave fossa. New articulation urban area toward distal tarsal cuatro try markedly concave rather than flat such as phytosaurs and other suchians (Long & Murry, 1995 ).