However, these types of descriptions had been predicated on remote white teeth as well as the positional investigation was in fact hypothesized having fun with ornithischian dinosaurs as the a product

However, these types of descriptions had been predicated on remote white teeth as well as the positional investigation was in fact hypothesized having fun with ornithischian dinosaurs as the a product

callenderi was indeed well-explained (Heckert, 2002 ; Hunt, 1989 ; Seem & Lucas, 1994 ; Padian, 1990 ). That have several enamel hit aspects within-situ teeth today allows an elegance away from past work. Appear ( 1989 ) is proper within the identifying premaxillary pearly whites out-of maxillary pearly whites. But really, white teeth like those regarding premaxilla (Figures 4e, f), characterized by being shaped mesiodistally and you may lingually rounded within apex, are also found in the anterior portion of the dentary. Maxillary (Data 4g, h) and you can dentary pearly whites (Shape 5d) inside ranks posterior towards the third tooth are nearly shaped mesiodistally, but often is actually lingually curved during the apex, labiolingually compressed, and also high expanded crowns. The shape of maxillary and you may dentary teeth may differ positionally rather than a discernable trend, perhaps about tooth substitute for.

One’s teeth off R

New prior face of the atlantal intercentrum are damaged out, nevertheless posterior 1 / 2 of the ability was well-preserved. Within the posterior consider (Profile 8c), the newest element is actually subrectangular which have slight dorsoventral constrictions across the midline. Brand new atlantal intercentrum try concave dorsally where they articulates into the atlantal pleurocentrum. They articulates into axial pleurocentrum which have a flat seat-designed epidermis (Figure 8d). The fresh ventral surface of the atlantal intercentrum is excavated by the an excellent deep depression bordered by the a-sharp anterior ridge. The latest lateral facial skin was incised because of the a-deep dorsoventrally created sulcus you to definitely contours anteriorly within their dorsal the amount. Both horizontal and you will ventral despair are not found in phytosaurs (e.grams., Machaeroprosopus mccauleyi, PEFO 31219), in which the atlantal intercentrum is actually otherwise nearly the same as that of Roentgen. callenderi.

5.six.step 1 Atlas-axis advanced

The fresh atlantal pleurocentrum, intercentrum, and you can neurapophysis exists (Figures 8a–c). The newest prezygapophysis of your atlantal neurapophysis is a small anteriorly-projecting game projection (Shape 8a). Into the phytosaurs (age.grams., PEFO 31219) and you may crocodylomorphs (Brochu, 1992 ), brand new prezygapophysis expands much more sideways. The newest postzygapophysis are long and increase-eg and you may plans posterodorsally. Stretching medially on zygapophyses is a standard thin flange you to definitely models the new roof of your own sensory tunnel.

The newest atlantal pluerocentrum (Figure 8b) is actually crescentic into the anterior and you will posterior opinions, in place of from inside the phytosaurs, in which it is rectangular in anterior have a look at (elizabeth.g., PEFO 31219). Both prior and you will posterior surfaces is actually convex, although anterior articular face try a little flatter and you may broad than just this new rear articular deal with. The fresh rear articular deal with and it has a superficial dorsoventrally popular sulcus you to definitely is even included in phytosaurs (e.grams., PEFO 31219). Brand new dorsal epidermis of one’s atlantal pleurocentrum try concave and you may mediolaterally twice as large as the anteroposteriorly much time. Proportionally, the atlantal pleurocentrum out-of R. callenderi is anteroposteriorly shorter as compared to exact same factor in L. meadei (TMM 31185–97) and you will T. coccinarum (AMNH 7634), or even they are very similar.

5.5 Postcrania Remote and related postcranial issues are typical from the quarries from the PFV 297 and PFV 414. A knowledgeable-preserved skeleton is that away from PEFO 34561, that may supply the cause for brand new reconstruction (Shape seven) and you may dysfunction, together with other specimens supplementing the dysfunction where indexed. 5.six Axial skeleton

The new axial intercentrum is not recognized away from one sample. The newest axial pleurocentrum (Contour 8d) out-of Roentgen. callenderi is approximately equant within the size. The newest prior articular deal with are dorsally concave in which it articulates that have the brand new atlantal elements; ventral to that area this new articular face is actually apartment and you may slopes posteroventrally where it can articulate for the axial intercentrum. The latest horizontal sides of your prior articular face of your axial pleurocentrum are offered as the margins abut to your parapophyses. The parapophyses have flat articular counters, was elevated on distinctive line of pedestals, and you may deal with posterolaterally. The new diapophyses form a bent point one face posterolaterally and you may somewhat ventrally. The fresh lateral alua epidermis of the centrum and has a-deep fossa rear into parapophysis. So it fossa are proportionally greater compared to L. meadei (TMM 31185-97) or T. coccinarum (AMNH 7634), though the breadth with the fossa transform as a result of ontogeny various other archosaurs (Irmis, 2007 ) which will be missing in a few aetosaurs (Desojo et al., 2012 ). The latest ventral surface of the axis centrum possesses a-sharp median ventral keel. This can be absent during the L. meadei.