The new centra of one’s rear caudal backbone (Shape 8n) is anteroposteriorly elongate and strongly amphicoelous

The new centra of one’s rear caudal backbone (Shape 8n) is anteroposteriorly elongate and strongly amphicoelous

5.six.6 Rear caudal vertebrae

Chevron aspects can be found but they are reduced line of than in the mid-caudal vertebrae and no line of groove into the midline of the ventral surface can be found. New transverse procedure are small laterally, dorsoventrally flattened forecasts about posterior half the bottom of the brand new neural arch. The new zygapophyses project a bit not in the centrum deal with and are usually small tab-eg processespared into the earlier spinal series new neural lower back was faster so you can a slimmer average ridge hooking up the fresh prezygapophyses and you may postzygapophyses.

5.six.7 Ribs

Cervical and you can trunk ribs try known from the relevant specimens and inside the bonebeds within PFV 297 and you can PFV 414. A nearly done cervical rib regarding PEFO 34561 try better-managed in fact it is lost simply the rear idea in addition to tuberculum (Figure 8o). The brand new prior procedure for the fresh new rib versions a circular projection and you may tapers posteriorly to create a finer procedure. In prior and you will rear consider, the brand new capitulum and also the root of the tuberculum was broke up of the strong grooves. In the medial see, the newest rear techniques contours anterodorsally and versions good ridge you to definitely gets the capitulum. Shallow fossae occur into the each side for the ridge. The length of the fresh new rib is quick, becoming a comparable size given that length of a beneficial cervical centrum.

Several prior trunk area ribs also are kept into the PEFO 34561 (Profile 8p). Are typical shed the brand new distal 50 % of the function. The fresh tuberculum is actually raised into the a pedestal that is egg-shaped inside cross-section and you may well-separated throughout the capitulum. The latest capitulum was elevated into an enthusiastic elongate pedestal that is game in cross section and you may established approximately forty five° from the tuberculum. A sharp dorsoventral ridge exists distal to your convergence away from the latest capitulum and you will tuberculum for the prior area of the rib. Around the latest ridge and also the axle during the medial examine are a mildly deep fossa. Inside the posterior evaluate, there is an extremely shallow fossa simply distal into overlap of your capitulum and tuberculum. The remainder rib shaft is actually convex anteriorly and you can apartment posteriorly and versions a great medially rounded rod.

An even more posterior trunk rib (PEFO 33848) is comparable except that the brand new rib axle curves far more highly medially. And additionally, the fresh capitulum and you will tuberculum commonly broke up on the elongate pedestals; he or she is connected because of the a thin ridge in addition to capitulum extends far more medially as compared to tuberculum. The fresh new prior ridge is actually quite quicker estimated compared to the even more prior trunk area rib, additionally the rear fossa only distal on the capitulum and tuberculum is a bit greater. The rest of the rib axle is far more egg-shaped during the cross section compared to far more anterior trunk area rib. The latest distal end try a little prolonged which can be concave in the distal evaluate.

5.6.8 Gastralia

A single gastralium is famous on the bonebed (PEFO 33847; Profile 8q). This new function provides a couple shafts one to setting an unbarred “V.” The newest top of gastralium was game and does not means a sharp section. The axle try oval for the cross-part, providing the element good flattened appearance. The possible lack of of a lot kept gastralia signifies that R. callenderi got couples gastralia like other aetosaurs (e.g., Typothorax coccinarum, Heckert ainsi que al., 2010 ) rather than the better matter various other pseudosuchians (elizabeth.grams., the fresh new loricatan Prestosuchus chiniquensis, Desojo et al., 2020 ).

5.6.nine Chevrons

Surprisingly, zero chevrons was in fact recovered about several quarries. It appears to be quite unlikely you to definitely Roentgen. callenderi lacked chevrons offered the popular occurrence various other archosauromorphs, so this most likely try a good taphonomic feeling considering the end “club” molded of the osteoderms across the end (come across lower than). In addition, the newest caudal spinal vertebrae have line of chevron issues on their ventral skin.