5.six.six Rear caudal backbone
Chevron facets exist but are quicker type of than in brand new mid-caudal spinal vertebrae without type of groove for the midline of the ventral facial skin is available. The brand new transverse techniques is actually brief sideways, dorsoventrally hit bottom forecasts regarding rear half of the bottom of the neural arc. This new zygapophyses endeavor somewhat outside of the centrum face and are generally quick tab-including processespared to the past vertebral series the brand new neural lower back is reduced so you can a thinner average ridge hooking up the fresh new prezygapophyses and you will postzygapophyses.
5.six.eight Ribs
Cervical and you may trunk area ribs is actually known in the relevant specimens and you will in bonebeds at the PFV 297 and you may PFV 414. A virtually over cervical rib out of PEFO 34561 is better-managed which will be missing simply their posterior tip and tuberculum (Profile 8o). The prior means of this new rib models a bent projection and you can tapers posteriorly to form a thin process. Into the prior and you will posterior check, the capitulum plus the foot of the tuberculum was separated by deep grooves. Inside medial glance at, the posterior techniques curves anterodorsally and models an effective ridge one to becomes brand new capitulum. Shallow fossae occur for the both sides on the ridge. The duration of the fresh new rib try small, are about the same size because the amount of an effective cervical centrum.
Numerous anterior trunk area ribs also are preserved for the PEFO 34561 (Figure 8p). Are destroyed the distal 1 / 2 of the latest function. The brand new tuberculum is raised to your a good pedestal that is egg-shaped within the cross-section and you may well-separated in the capitulum. The fresh capitulum is actually raised with the an enthusiastic elongate pedestal that’s game within the cross section and you can depending as much as forty five° throughout the tuberculum. A sharp dorsoventral ridge exists distal into the overlap regarding brand new capitulum and you will tuberculum for the anterior region of the rib. Among brand new ridge therefore the shaft in medial see is a moderately deep fossa. In the posterior view, there clearly was an extremely shallow fossa only distal towards the overlap of your capitulum and you can tuberculum. Other rib axle is convex anteriorly and you will flat posteriorly and you can forms a great medially curved pole.
A very posterior trunk area rib (PEFO 33848) is comparable other than this new rib axle contours a great deal more firmly medially. Also, the capitulum and you can tuberculum are not split to the elongate pedestals; he or she is connected because of the a thin ridge and the capitulum offers much more medially compared to tuberculum. The brand new anterior ridge was slightly quicker projected as compared to significantly more prior trunk rib, as well as the posterior fossa merely distal for the capitulum and you may tuberculum is actually slightly better. The remainder rib shaft is more egg-shaped inside the cross part as compared to even more anterior trunk area rib. The distal avoid is a little stretched and that’s concave in the distal evaluate.
5.six.8 Gastralia
An individual gastralium is known on bonebed (PEFO 33847; Shape 8q). Brand new element has actually a few shafts one form an open “V.” The new apex of one’s gastralium was circular and will not setting a-sharp point. This new shaft is egg-shaped in the cross-point, providing the ability a hit bottom looks. The possible lack of of several maintained gastralia suggests that Roentgen. callenderi had partners gastralia like other aetosaurs (e.g., Typothorax coccinarum, Heckert et al., 2010 ) as opposed to the deeper amount in other pseudosuchians (elizabeth.g., new loricatan Prestosuchus chiniquensis, Desojo mais aussi al., 2020 ).
5.6.9 Chevrons
Strangely, no chevrons was indeed recovered about several quarries. It seems quite unlikely one R. callenderi lacked chevrons given the well-known occurrence in other archosauromorphs, and this most likely is good taphonomic feeling considering the tail “club” molded because of the osteoderms along the tail (pick less than). In addition, the new caudal backbone provides line of chevron issues on their ventral surface.