The latest tested femur (PEFO 33843) enjoys a diameter off fifteen

callenderi shot, whoever middle-diaphysis biggest axis diameter ranges regarding 14.4 (PEFO 34561) in order to twenty-two.step one mm (PEFO 33991). step 1, which is just below this new imply (sixteen.4 mm) and you may just like the median proportions (fifteen.cuatro mm) of your own take to. Though dimensions are not the best proxy to have ontogeny (Griffin ainsi que al., 2020 ), the current presence of significantly larger femora (PEFO 33991 and you may 35318) as well as the decreased an EFS in the PEFO 33843 both mean that the latter personal was not adult, though it got more than likely enacted the purpose of inflection with its progress bend. For this reason, we can hypothesize that all of your specimens in this research try none early juveniles or people from a great skeletal readiness angle.

5.9.2 Paramedian osteoderms

From inside the researching the latest osteohistology of your tested paramedian osteoderms out-of R. callenderi and Krzyzanowskisaurus hunti, you should remember that certain noticed version could be because of positional consequences, in terms of the fresh new osteoderm’s exact area on carapace and where along the osteoderm the histological part try drawn. Less than, i explain both osteoderms along with her, explicitly listing in which it differ.

Such as the femur, the new sampled paramedian osteoderm regarding R. callenderi (PEFO 33940a) have a thin level out of sparry calcite (Figures 13f, i), while the brand new osteoderm off K. hunti (UCMP 175058) possess a level out of amber-colored glue, maybe shellac (Figures 13h, j). Splits and you may internal places of one another points try permineralized by the calcite spar. Quick zones off UCMP 175058 is actually permineralized from the an opaque reddish-brown nutrient (Figures 13h, j), probably a metal nutrient like siderite otherwise hematite. Each other specimens display a small number of high breaks that have displacement and you may better level of less hairline fractures (Rates 13e–j) but are if you don’t really-kept.

The evidence regarding reducing development, but zero EFS, is actually broadly consistent with the dimensions listing of femora on the PEFO Roentgen

One another osteoderms is actually mostly compact cortical bone with a fairly quick number of moderately size of vascular rooms (Figures 13f–j); these room are smaller compared to those seen in new aetosauriform A beneficial. geoffreyi ( : fig. 8), however, much bigger versus densely-packaged quick room that comprise inner cancellous structure from inside the aetosaurs (Cerda mais aussi al., 2018 ; Cerda & Desojo, 2011 ; Parker et al., 2008 ; Scheyer ainsi que al., 2014 ). Due to the fact noticed by the Scheyer mais aussi al. ( 2014 : pg. 255) for a small paramedian osteoderm from R. callenderi, these types of endosteal spaces is rimmed by secondary lamellar tissue; this new additional cells filling these spaces is much more thorough on the osteoderm out-of K. hunti (Rates 13h, j). On the sample from K. hunti, brand new ventral border associated with the refurbished area forms reasonable discontinuity involving the supplementary muscle and top tissues of your own basal cortex (grey arrow when you look at the Shape 13j) that is similar to the resorption line Cerda ainsi que al. ( 2018 ) revealed to own aetosaurs, but it edge is actually shorter line of within the R. callenderi (Shape 13i). However, the new basal cortex both in specimens is virtually totally avascular, help save for a few commonly spaced easy streams and pri ) noticed to possess Revueltosaurus together with symptom in An excellent. geoffreyi ( ), whereas aetosaurs be seemingly some way more vascular in this field (Cerda et al., 2018 ; Scheyer et al., 2014 ). So it primary bone of one’s basal cortex constitutes synchronous-fibered muscle, however, lacks new laminar feel revealed for A. geoffreyi (cf. , p. 16). The latest basal cortex of your own Roentgen. callenderi osteoderm features relatively plentiful Sharpey’s materials within a high direction into the long axis of your own cross-area (Figure 13i, just as the updates noticed in particular aetosaurs (cf. Cerda et al., 2018 : fig. 7g–h), while they look is absent in K. hunti (Contour 13j).

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