The fresh new centra of posterior caudal vertebrae (Profile 8n) are anteroposteriorly elongate and firmly amphicoelous

5.six.6 Posterior caudal spinal vertebrae

Chevron elements are present however they are less line of compared to the latest mid-caudal vertebrae without collection of groove towards midline of the ventral facial skin can be acquired. The brand new transverse process try short sideways, dorsoventrally hit bottom projections on posterior 1 / 2 of the base of the brand new neural arc. The brand new zygapophyses opportunity somewhat outside the centrum face as they are brief tab-such as for instance processespared into the earlier in the day vertebral collection this new neural lower back are reduced to help you a thinner average ridge hooking up the prezygapophyses and you can postzygapophyses.

5.six.eight Ribs

Cervical and you may trunk ribs try recognized in the relevant specimens and you can within the bonebeds on PFV 297 and you can PFV 414. An almost done cervical rib from PEFO 34561 was well-maintained which can be missing merely their posterior idea and also the tuberculum (Figure 8o). The fresh new anterior means of brand new rib forms a curved projection and you will tapers posteriorly to create a thin procedure. From inside the anterior and posterior take a look at, the brand new capitulum additionally the base of the tuberculum was separated by the deep grooves. Inside the medial see, brand new rear process contours anterodorsally and versions a beneficial ridge that gets the new capitulum. Low fossae occur to your either side associated with ridge. The size of new rib try brief, are about the same size because the length of an excellent cervical centrum.

Multiple prior trunk area ribs are maintained during the PEFO 34561 (Shape 8p). Are all shed the new distal 1 / 2 of the new feature. New tuberculum are raised on an excellent pedestal which is oval in cross-section and you may well-separated on the capitulum. The brand new capitulum try increased towards an enthusiastic elongate pedestal that’s rounded when you look at the cross-section and you will established up to forty five° about tuberculum. A-sharp dorsoventral ridge exists distal with the overlap out of this new capitulum and you may tuberculum into prior section of the rib. Between the fresh ridge and axle from inside the medial examine try a mildly strong fossa. From inside the rear glance at, there is certainly an extremely superficial fossa only distal on the overlap of your capitulum and you will tuberculum. All of those other rib axle are convex anteriorly and you will flat posteriorly and you may versions an excellent medially curved rod.

A far more posterior trunk area rib (PEFO 33848) is similar besides the brand new rib shaft shape far more strongly medially. Also, the newest capitulum and you can tuberculum are not broke up into elongate pedestals; he could be connected of the a thinner ridge and capitulum runs way more medially compared to the tuberculum. The latest prior ridge try a bit less projected versus far more prior trunk area rib, and posterior fossa merely distal for the capitulum and you will tuberculum is actually a bit deeper. The remainder rib shaft is more egg-shaped within the get across area versus so much more anterior trunk rib. The fresh new distal prevent are quite extended that’s concave inside distal see.

5.six.8 Gastralia

One gastralium known regarding bonebed (PEFO 33847; Contour 8q). New function keeps a couple of shafts you to definitely function an unbarred “V.” The latest apex of your own gastralium are game and will not setting a-sharp point. New axle is actually egg-shaped into the cross-section, supplying the element a great flattened physical appearance. The deficiency of of numerous managed gastralia suggests that R. callenderi got couple gastralia like other aetosaurs (age.grams., Typothorax coccinarum, Heckert et al., 2010 ) rather than the higher amount in other pseudosuchians (e.g., the brand new loricatan Prestosuchus chiniquensis, Desojo ainsi que al., 2020 ).

5.six.9 Chevrons

Unusually, no chevrons were Г‘asualDates telefon numarasД± recovered on the a couple quarries. It appears slightly unrealistic you to R. callenderi lacked chevrons considering their preferred occurrence in other archosauromorphs, and this most likely are an excellent taphonomic impression given the end “club” designed by osteoderms along the end (get a hold of below). Furthermore, the fresh new caudal spinal vertebrae enjoys distinct chevron elements on the ventral skin.