5.six.6 Rear caudal spinal vertebrae
Chevron facets can be found but they are reduced collection of than in brand new mid-caudal backbone and no distinct groove towards the midline of ventral facial skin can be acquired. The fresh transverse processes try quick sideways, dorsoventrally hit bottom projections on the rear half the base of new sensory arch. The zygapophyses endeavor quite not in the centrum face and they are brief tab-instance processespared to your prior spine collection new sensory back is less to a thinner median ridge hooking up brand new prezygapophyses and you will postzygapophyses.
Cervical and you may trunk ribs are identified in the related specimens and you can during the bonebeds during the PFV 297 and you can PFV 414. A virtually complete cervical rib from PEFO 34561 try better-maintained and that’s destroyed just its posterior suggestion additionally the tuberculum (Figure 8o). This new anterior procedure of the latest rib versions a curved projection and tapers posteriorly in order to create a thin process. From inside the anterior and you may posterior consider, the brand new capitulum and also the root of the tuberculum is split by deep grooves. In medial check, the latest posterior techniques contours anterodorsally and you will models good ridge you to becomes brand new capitulum countrymatch. Low fossae occur on the each side of this ridge. Along the brand new rib try small, being a comparable duration due to the fact amount of a cervical centrum.
Multiple anterior trunk ribs also are maintained when you look at the PEFO 34561 (Profile 8p). All are lost the new distal 1 / 2 of the fresh element. New tuberculum is raised toward good pedestal which is oval during the cross-section and you will well-separated on capitulum. The latest capitulum is actually raised into the a keen elongate pedestal that’s rounded within the cross-section and you can oriented approximately 45° from the tuberculum. A-sharp dorsoventral ridge is obtainable distal on overlap off the newest capitulum and you can tuberculum towards prior section of the rib. In-between the ridge additionally the shaft inside the medial look at is a moderately deep fossa. For the rear check, there can be a very shallow fossa only distal on the overlap of capitulum and you will tuberculum. The rest of the rib shaft was convex anteriorly and you will apartment posteriorly and you may forms a beneficial medially curved rod.
An even more posterior trunk rib (PEFO 33848) is comparable apart from the newest rib axle curves so much more firmly medially. And, the brand new capitulum and you will tuberculum are not separated on the elongate pedestals; they are linked of the a thin ridge and the capitulum extends a great deal more medially compared to tuberculum. The latest anterior ridge was slightly smaller estimated compared to the much more prior trunk area rib, and the posterior fossa merely distal toward capitulum and tuberculum was a little higher. The rest of the rib axle is more oval during the mix part compared to the a whole lot more anterior trunk rib. Brand new distal end try somewhat offered which can be concave for the distal view.
An individual gastralium is famous on the bonebed (PEFO 33847; Shape 8q). The newest function provides a few shafts that mode an unbarred “V.” The new top of the gastralium was round and will not function a-sharp section. The shaft was oval in the mix-area, supplying the ability an excellent hit bottom physical appearance. Having less of many kept gastralia suggests that R. callenderi had couples gastralia like many aetosaurs (elizabeth.g., Typothorax coccinarum, Heckert mais aussi al., 2010 ) rather than the higher amount in other pseudosuchians (age.grams., the newest loricatan Prestosuchus chiniquensis, Desojo ainsi que al., 2020 ).
Strangely, no chevrons was in fact retrieved on a couple quarries. It appears to be a bit unlikely one to R. callenderi lacked chevrons considering its well-known density various other archosauromorphs, and this probably was a taphonomic effect considering the end “club” shaped because of the osteoderms along side tail (see less than). In addition, this new caudal spinal vertebrae have distinct chevron issues to their ventral skin.