The fresh new centra of the rear caudal backbone (Profile 8n) is actually anteroposteriorly elongate and you will strongly amphicoelous
5.6.six Rear caudal vertebrae
Chevron aspects are present but they are shorter distinctive line of compared to the brand new mid-caudal vertebrae and no type of groove toward midline of ventral facial skin is present. The newest transverse techniques are small sideways, dorsoventrally flattened projections about rear 1 / 2 of the base of the fresh sensory arc. The zygapophyses venture a little beyond the centrum deal with as they are brief tab-such as processespared for the early in the day vertebral show the new neural spine is actually quicker in order to a thinner median ridge connecting new prezygapophyses and you may postzygapophyses.
Cervical and you can trunk ribs is actually identified regarding the relevant specimens and you will in the bonebeds during the PFV 297 and you will PFV 414. An about done cervical rib out-of PEFO 34561 is well-preserved that is missing only the posterior idea in addition to tuberculum (Shape 8o). This new anterior means of the newest rib variations a circular projection and you can tapers posteriorly to create a slimmer process. Into the prior and posterior check, the new capitulum therefore the root of the tuberculum try separated by deep grooves. In medial see, brand new rear processes contours anterodorsally and you may forms an excellent ridge you to definitely gets the newest capitulum. Shallow fossae exist for the either side from the ridge. The duration of the brand new rib are brief, are comparable duration as amount of an effective cervical centrum.
Numerous anterior trunk area ribs also are kept inside PEFO 34561 (Profile 8p). Are common shed the fresh distal 50 % of new ability. New tuberculum was increased into the an excellent pedestal that is oval for the cross-section and you will well separated regarding capitulum. New capitulum was increased towards the a keen elongate pedestal that’s round within the cross section and depending whenever forty five° from the tuberculum. A-sharp dorsoventral ridge is obtainable distal towards overlap regarding the new capitulum and you can tuberculum to your prior area of the rib. In-between brand new ridge as well as the axle inside the medial view was a moderately deep fossa. In posterior have a look at, you will find an extremely low fossa only distal towards convergence of the capitulum and tuberculum. All of those other rib shaft is actually convex anteriorly and you can apartment posteriorly and versions good medially curved pole.
An even more posterior trunk rib (PEFO 33848) is comparable except that the newest rib axle contours significantly more strongly medially. Also, new capitulum and you will tuberculum aren’t broke up towards elongate pedestals; he is connected from the a thin ridge while the capitulum expands significantly more medially than the tuberculum. The anterior ridge try a bit reduced estimated than the more anterior trunk rib, and also the rear fossa merely distal towards the capitulum and tuberculum try quite higher. Other rib axle is far more egg-shaped for the mix point compared to a whole lot more anterior trunk rib. New distal end was somewhat offered in fact it is concave when you look at the distal check.
An individual gastralium is famous in the bonebed (PEFO 33847; Figure 8q). This new ability features a couple of shafts you to function an open “V.” Brand new apex of your gastralium are rounded and will not mode a-sharp part. The newest axle was egg-shaped when you look at the get across-section, providing the feature a hit bottom appearance. The deficiency of many kept gastralia shows that R. callenderi had couple gastralia like other aetosaurs (elizabeth.g., Typothorax coccinarum, Heckert et al., 2010 ) rather than the greater number various other pseudosuchians (e.g., the loricatan Prestosuchus chiniquensis, Desojo mais aussi al., 2020 ).
Strangely, zero chevrons have been recovered from the one or two quarries. It appears to be some unrealistic one to Roentgen. callenderi lacked chevrons given its popular density in other archosauromorphs, which means this most likely is a great taphonomic perception given the end “club” shaped because of the osteoderms over the end (pick below). In addition, the brand new caudal backbone possess distinct chevron facets on their ventral body.