An educated-maintained tibia is a remote leftover feature regarding the PFV 297 (PEFO 34273; Rates 10l–o)

An educated-maintained tibia is a remote leftover feature regarding the PFV 297 (PEFO 34273; Rates 10l–o)

5.7.several Tibia

The latest proximal lead of tibia is a lot expanded similarly to aetosaurs; Parrish ( 1986 ) suggested the longer tibial head could be an effective synapomorphy off the fresh new aetosaurs. Such as for example aetosaur tibiae, the latest proximal body of your tibia inside the Roentgen. callenderi are divided from the good ridge to the a few equal sized quite concave medial and you will horizontal condyles (Rates 10l–o). Brand new proximal counters of your medial and lateral condyles was concave, and you will a distinct lip can be acquired where the one or two condyles fulfill. The new proximal direct of the tibia are greatly stretched mediolaterally relative into the diameter of shaft for the best expansion medially (Shape 10n). The latest axle are subrounded when you look at the cross section. The brand new tibia size is roughly several-thirds along the fresh femur (Research S2). A straight ridge can be found with the posterolateral side of the axle.

The latest distal prevent is additionally mediolaterally longer but not once the firmly because the proximal stop and firmly is comparable to the new suchian position (Shape 10o). The newest medial part of the articular body projects distally which can be convex. The latest horizontal bit was smaller distally offered together its posterior edge and you can an effective rear groove splits both articulation counters.

5.7.thirteen Fibula

Inside PEFO 34561, the newest fibula is pretty straight (Rates 10p–s), varying of that aetosaurians, having a pronounced “kink” (e.grams., Letter. engaeus; PVL 3525; L. meadei, TTM 31185-97). The new proximal end was anteroposteriorly expanded and circular in the proximal have a look at. The small, game iliofibularis crest is found that-third the exact distance distally on horizontal surface of the shaft (Figure 10p). Its external skin is smooth, barely higher than the surface of the shaft varying on the much more obvious rugose crest found in aetosaurs (Parrish, 1986 ) which is even more distally positioned. The newest distal avoid was mediolaterally compressed and you can prolonged anteroposteriorly relative to the shaft. The fresh distal articular body was smooth and you may beveled anteromedially such as phytosaurs (elizabeth.g., UCMP 122621).

5.7.fourteen Astragalus

The newest astragalus (Data 11a–f) is similar to that most other suchians (age.grams., aetosaurs). In the prior view, a big anterior empty takes up most of the new prior skin (Shape 11a). Brand new tibial and fibular surfaces satisfy within an optimum in prior examine. Posteriorly, this new astragalar peg (Figure 11b) exists on the posterodistal skin just ventral on the distolaterally trending rear groove. The new astragalar peg keeps a beneficial mediolateral duration on the double this new anteroposterior peak of your element. The latest posterodistal body of the peg enjoys a shallow department, but this division isn’t mirrored as an excellent ridge for the expressing surface of your calcaneum. The latest fibular aspect of the astragalus is actually concave and subrectangular (Contour 11e). The fresh tibial articular element (Contour 11c) is actually split into a couple of concave regions having a small convex town separating a smaller horizontal articular surface and you can more substantial medial articular surface. The higher body articulates to the ventral means of the tibia. Small articular surface is found toward whole dorsal epidermis of the fibular process. A thinner ridge sets apart new tibial and you may fibular factors. Brand new distal roller are convex and you can is much like that from most other suchians (pick Sereno, 1991 ; Nesbitt, 2011 ).

5.eight.fifteen Calcaneum

The calcaneum (Rates 11g–l) can be like very early suchians (e.g., aetosaurs). The hemicylindrical articular facial skin is actually split of the an enthusiastic anteroposteriorly popular ridge into the fibular facet and you can astragalar facet. The latest astragalar aspect is totally medial to your fibular facet, rather than the issue within the E. okeeffeae (AMNH FR 30857), P. kirkpatricki (e.g., TTU-P 9002), and crocodylomorphs (e.g., “H. agilis” YPM 41198), where the astragalar element is based way more ventrally (Nesbitt, 2011 ). The latest concave socket to your astragalar peg (Contour 11h) does not penetrate brand new medial wall of the hemicylindrical articular skin. The fresh calcaneal tuber is brought posteriorly in that way out-of a lot of early suchians. The fresh calcaneal tuber are mediolaterally extended and expanded dorsal and you can a bit throughout the ventral guidelines (Profile 11k). Brand new tuber doesn’t have an enthusiastic anteroposteriorly oriented groove like in P. kirkpatricki (age.grams., TTU P-9002) and you may crocodylomorphs (elizabeth.g., “H. agilis,” YPM 41198). Rather, the brand new posterior surface is concave such as aetosaurs (e.grams., Typothorax antiquum; Lucas et al., 2002 ). This new ventral epidermis carries a beneficial concave fossa. Brand new articulation urban area on distal tarsal 4 was significantly concave and never flat as in phytosaurs or other suchians (Long & Murry, 1995 ).


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