A knowledgeable-preserved tibia is actually an isolated left element about PFV 297 (PEFO 34273; Numbers 10l–o)

A knowledgeable-preserved tibia is actually an isolated left element about PFV 297 (PEFO 34273; Numbers 10l–o)

5.7.twelve Tibia

Brand new proximal direct of your tibia is a lot stretched similarly to aetosaurs; Parrish ( 1986 ) recommended that the extended tibial direct tends to be a great synapomorphy out-of the latest aetosaurs. For example aetosaur tibiae, this new proximal skin of the tibia inside R. callenderi try split up because of the a beneficial ridge to the two equal size of slightly concave medial and you may horizontal condyles (Rates 10l–o). The fresh proximal counters of the medial and you may horizontal condyles was concave, and you may a definite lip can be obtained where in actuality the a couple of condyles fulfill. The latest proximal head of the tibia are significantly expanded mediolaterally cousin into the diameter of axle on the best expansion medially (Profile 10n). The latest shaft is actually subrounded when you look at the cross-section. This new tibia length is roughly one or two-thirds the size of brand new femur (Studies S2). A straight ridge is found towards the posterolateral area of the axle.

New distal end is additionally mediolaterally lengthened although not as strongly because proximal prevent and you can firmly resembles the fresh suchian status (Figure 10o). The new medial part of the articular surface tactics distally and that’s convex. The fresh lateral section try less distally stretched along the rear line and you can an excellent posterior groove splits both articulation surfaces.

5.eight.thirteen Fibula

Within the PEFO 34561, the new fibula is quite straight (Data 10p–s), different of that of aetosaurians, which have an obvious “kink” (elizabeth.grams., N. engaeus; PVL 3525; L. meadei, TTM 31185-97). Brand new proximal stop are anteroposteriorly longer and you may circular within the proximal take a look at. The little, game iliofibularis crest is positioned one to-3rd the distance distally on the lateral body of the shaft (Shape 10p). The external facial skin are smooth, barely more than top of the shaft different in the more pronounced rugose crest found in aetosaurs (Parrish, 1986 ) that’s a lot more distally organized. The newest distal prevent try mediolaterally compressed and you may longer anteroposteriorly prior to the fresh axle. The fresh new distal articular surface try smooth and you can beveled anteromedially as in phytosaurs (age.grams., UCMP 122621).

5.7.fourteen Astragalus

The brand new astragalus (Numbers 11a–f) is a lot like that of almost every other suchians (e.g., aetosaurs). Inside the prior take a look at, a huge anterior hollow uses up most of the brand new prior surface (Profile 11a). The new tibial and you may fibular surfaces satisfy within a peak within the prior glance at. Posteriorly, the newest astragalar peg (Shape 11b) can be acquired toward posterodistal surface just ventral on the distolaterally popular posterior groove. This new astragalar peg enjoys a mediolateral length from the double the new anteroposterior level of function. New posterodistal body of peg have a superficial department, however, it section is not reflected because the good ridge towards articulating facial skin of the calcaneum. New fibular aspect of the astragalus is concave and subrectangular (Figure 11e). Brand new tibial articular part (Shape 11c) are divided in to one or two concave nations having a little convex urban area breaking up a smaller sized horizontal articular body and you will a much bigger medial articular skin. The greater facial skin articulates on ventral procedure of the tibia. The smaller articular body is based to the entire dorsal surface of one’s fibular process. A slimmer ridge sets apart the latest tibial and you can fibular issues. The newest distal roller try convex and you may is similar to the ones from most other suchians (see Sereno, 1991 ; Nesbitt, 2011 ).

5.seven.15 Calcaneum

The brand new calcaneum (Figures 11g–l) is like extremely very early suchians (elizabeth.grams., aetosaurs). The brand new hemicylindrical articular facial skin are separated from the an enthusiastic anteroposteriorly popular ridge towards the fibular factors and astragalar part. The brand new astragalar aspect is completely medial to your bumble nedir fibular part, as opposed to the issue inside the Elizabeth. okeeffeae (AMNH FR 30857), P. kirkpatricki (age.g., TTU-P 9002), and crocodylomorphs (elizabeth.grams., “H. agilis” YPM 41198), where in fact the astragalar facet is located a lot more ventrally (Nesbitt, 2011 ). The concave retailer into the astragalar peg (Figure 11h) cannot penetrate the latest medial wall structure of one’s hemicylindrical articular epidermis. Brand new calcaneal tuber are led posteriorly in that way from nearly all early suchians. The newest calcaneal tuber was mediolaterally expanded and you can offered dorsal and you will somewhat about ventral guidelines (Contour 11k). The brand new tuber does not have an enthusiastic anteroposteriorly depending groove as in P. kirkpatricki (age.grams., TTU P-9002) and you can crocodylomorphs (e.g., “H. agilis,” YPM 41198). Rather, the brand new rear epidermis is concave such as aetosaurs (elizabeth.g., Typothorax antiquum; Lucas ainsi que al., 2002 ). The latest ventral epidermis holds good concave fossa. The latest articulation area with the distal tarsal 4 is actually significantly concave and not apartment such as phytosaurs or other suchians (A lot of time & Murry, 1995 ).