The best-preserved tibia is actually an isolated remaining feature regarding PFV 297 (PEFO 34273; Rates 10l–o)

The best-preserved tibia is actually <a href="https://datingranking.net/tr/afrointroductions-inceleme/">afrointroductions uygulamasД±</a> an isolated remaining feature regarding PFV 297 (PEFO 34273; Rates 10l–o)

5.eight.12 Tibia

The new proximal direct of tibia is a lot offered similarly to aetosaurs; Parrish ( 1986 ) advised your offered tibial direct may be an excellent synapomorphy out-of brand new aetosaurs. Eg aetosaur tibiae, the newest proximal skin of your own tibia within the R. callenderi are split because of the a great ridge into the a couple equal size of somewhat concave medial and you will lateral condyles (Data 10l–o). New proximal surfaces of one’s medial and you may horizontal condyles is concave, and you can a distinct lip is available where in fact the one or two condyles satisfy. New proximal direct of your own tibia is actually considerably lengthened mediolaterally relative towards the diameter of your shaft into finest extension medially (Figure 10n). The brand new shaft was subrounded from inside the cross section. The latest tibia size is roughly a couple of-thirds along this new femur (Investigation S2). A vertical ridge is located into the posterolateral section of the axle.

New distal prevent is even mediolaterally expanded yet not because strongly because the proximal stop and you will strongly is comparable to the newest suchian updates (Contour 10o). The brand new medial portion of the articular facial skin ideas distally which can be convex. The newest horizontal piece try less distally prolonged collectively the rear border and a posterior groove divides the 2 articulation surfaces.

5.7.13 Fibula

In PEFO 34561, the newest fibula is quite straight (Numbers 10p–s), varying off compared to aetosaurians, which have an obvious “kink” (age.g., N. engaeus; PVL 3525; L. meadei, TTM 31185-97). The brand new proximal prevent try anteroposteriorly prolonged and you can game during the proximal see. The small, round iliofibularis crest is found one to-third the length distally regarding lateral surface of axle (Figure 10p). The external surface are effortless, barely raised above the top of shaft differing about much more obvious rugose crest used in aetosaurs (Parrish, 1986 ) which is way more distally positioned. The distal prevent are mediolaterally compressed and you may expanded anteroposteriorly prior to the fresh new axle. The fresh distal articular epidermis is simple and you can beveled anteromedially such as phytosaurs (elizabeth.g., UCMP 122621).

5.seven.fourteen Astragalus

This new astragalus (Figures 11a–f) is similar to regarding almost every other suchians (elizabeth.grams., aetosaurs). Inside the anterior view, a giant prior empty uses up a lot of the fresh anterior body (Contour 11a). The newest tibial and you may fibular surfaces meet from the an optimum within the prior view. Posteriorly, the astragalar peg (Profile 11b) exists on the posterodistal skin only ventral towards the distolaterally popular posterior groove. New astragalar peg has actually an excellent mediolateral size from the twice the newest anteroposterior peak of the feature. The new posterodistal facial skin of your own peg have a low division, but it division is not reflected as the good ridge toward revealing body of your own calcaneum. The fresh new fibular facet of the astragalus are concave and subrectangular (Shape 11e). This new tibial articular facet (Profile 11c) try put into a couple of concave countries having a small convex city splitting up a smaller horizontal articular body and you can more substantial medial articular facial skin. The bigger surface articulates towards ventral procedure for the new tibia. Small articular epidermis is found with the whole dorsal facial skin of the fibular processes. A thin ridge sets apart the brand new tibial and you can fibular elements. The fresh new distal roller is convex and you can is similar to the ones from almost every other suchians (select Sereno, 1991 ; Nesbitt, 2011 ).

5.eight.15 Calcaneum

The latest calcaneum (Rates 11g–l) can be similar to that of really very early suchians (elizabeth.grams., aetosaurs). The fresh new hemicylindrical articular body are split because of the an enthusiastic anteroposteriorly trending ridge on fibular element and you may astragalar facet. The brand new astragalar facet is very medial to the fibular part, instead of the challenge from inside the Age. okeeffeae (AMNH FR 30857), P. kirkpatricki (elizabeth.grams., TTU-P 9002), and you may crocodylomorphs (elizabeth.g., “H. agilis” YPM 41198), where in actuality the astragalar facet is based way more ventrally (Nesbitt, 2011 ). The concave socket toward astragalar peg (Shape 11h) cannot infiltrate this new medial wall of your own hemicylindrical articular surface. The latest calcaneal tuber is led posteriorly by doing this away from several of very early suchians. Brand new calcaneal tuber was mediolaterally expanded and you will offered dorsal and you may quite throughout the ventral direction (Figure 11k). The tuber does not have a keen anteroposteriorly built groove as with P. kirkpatricki (e.g., TTU P-9002) and you may crocodylomorphs (age.grams., “H. agilis,” YPM 41198). As an alternative, the fresh posterior surface is actually concave such as aetosaurs (elizabeth.g., Typothorax antiquum; Lucas ainsi que al., 2002 ). The newest ventral skin contains an effective concave fossa. This new articulation area on the distal tarsal cuatro is actually significantly concave rather than apartment as with phytosaurs or any other suchians (A lot of time & Murry, 1995 ).

Laisser un commentaire

Votre adresse e-mail ne sera pas publiée.