A knowledgeable-managed tibia are an isolated remaining element regarding PFV 297 (PEFO 34273; Figures 10l–o)

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14 Aug

A knowledgeable-managed tibia are an isolated remaining element regarding PFV 297 (PEFO 34273; Figures 10l–o)

A knowledgeable-managed tibia are an isolated remaining element regarding PFV 297 (PEFO 34273; Figures 10l–o)

5.eight.twelve Tibia

The latest proximal head of your tibia is much expanded similarly to aetosaurs; Parrish ( 1986 ) advised that stretched tibial lead tends to be a synapomorphy out-of brand new aetosaurs. Such as for example aetosaur tibiae, the newest proximal epidermis of your tibia for the R. callenderi try split up of the an effective ridge to your several equal measurements of some concave medial and you will horizontal condyles (Data 10l–o). The newest proximal surfaces of the medial and you may lateral condyles is concave, and you will a definite lip is available where in fact the two condyles meet. The newest proximal head of the tibia are greatly lengthened mediolaterally cousin into the diameter of one’s shaft to the most useful expansion medially (Profile 10n). New axle was subrounded from inside the cross-section. The newest tibia duration is approximately two-thirds along the fresh femur (Investigation S2). A straight ridge is positioned on posterolateral region of the axle.

This new distal end is additionally mediolaterally expanded not due to the fact highly given that proximal avoid and you will firmly is similar to the latest suchian reputation (Figure 10o). Brand new medial part of the articular surface methods distally that will be convex. The newest lateral piece try shorter distally prolonged together their rear edge and you will a rear groove splits both articulation counters.

5.eight.thirteen Fibula

When you look at the PEFO 34561, the fibula is pretty upright (Rates 10p–s), differing out of regarding aetosaurians, with an obvious “kink” (elizabeth.g., Letter. engaeus; PVL 3525; L. meadei, TTM 31185-97). The fresh proximal stop are anteroposteriorly stretched and you may circular inside proximal have a look at. The little, circular iliofibularis crest is found that-3rd the distance distally about horizontal facial skin of your axle (Shape 10p). The outside facial skin was easy, scarcely greater than the surface of the axle different regarding alot more noticable rugose crest utilized in aetosaurs (Parrish, 1986 ) that’s a great deal more distally arranged. Brand new distal prevent was mediolaterally compacted and you will lengthened anteroposteriorly relative to new axle. The newest distal articular epidermis is simple and beveled anteromedially as with phytosaurs (e.grams., UCMP 122621). Astragalus

The new astragalus (Figures 11a–f) is similar to regarding most other suchians (age.g., aetosaurs). Within the prior examine, a huge prior empty occupies a lot of brand new anterior surface (Contour 11a). The fresh new tibial and you can fibular counters meet at the a top for the anterior see. Posteriorly, this new astragalar peg (Shape 11b) can be acquired toward posterodistal body just ventral into the distolaterally trending posterior groove. The new astragalar peg has actually a mediolateral length in the double the brand new anteroposterior height of the element. New posterodistal skin of peg provides a low department, but which division is not shown since the a ridge into the showing body of your own calcaneum. The brand new fibular aspect of the astragalus is actually concave and subrectangular (Contour 11e). The newest tibial articular element (Shape 11c) try split up into a few concave regions having a small convex city separating a smaller sized horizontal articular body and you may more substantial medial articular epidermis. The bigger facial skin articulates towards ventral procedure of the fresh new tibia. Small articular epidermis is found for the whole dorsal epidermis of fibular processes. A slimmer ridge distinguishes brand new tibial and fibular facets. The fresh new distal roller was convex and you will resembles those of almost every other suchians (get a hold of Sereno, 1991 ; Nesbitt, 2011 ).

5.eight.fifteen Calcaneum

The fresh new calcaneum (Figures 11g–l) are similar to that of most very early suchians (elizabeth.grams., aetosaurs). The fresh hemicylindrical articular surface is split of the an enthusiastic anteroposteriorly trending ridge on the fibular facet and you can astragalar aspect. Brand new astragalar facet is very medial on fibular factors, in place of the problem when you look at the E. okeeffeae (AMNH FR 30857), P. kirkpatricki (age.grams., TTU-P 9002), and you may crocodylomorphs (e.grams., “H. agilis” YPM 41198), in which the astragalar facet can be found even more ventrally (Nesbitt, 2011 ). The concave retailer towards the astragalar peg (Profile 11h) does not infiltrate this new medial wall surface of your hemicylindrical articular body. The fresh new calcaneal tuber is actually brought posteriorly in that way of several of very early suchians. The newest calcaneal tuber was mediolaterally offered and longer dorsal and you may quite from the ventral recommendations (Profile 11k). This new tuber doesn’t always have a keen anteroposteriorly built groove as with P. kirkpatricki (elizabeth.grams., TTU P-9002) and you will crocodylomorphs (elizabeth.g., “H. agilis,” YPM 41198). Rather, the newest rear skin is actually concave such as aetosaurs (elizabeth.g., Typothorax antiquum; Lucas ainsi que al., 2002 ). The fresh new ventral skin bears a concave fossa. The articulation city into the distal tarsal 4 try markedly concave and not flat as in phytosaurs or any other suchians (Long & Murry, 1995 ).

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