not, these types of meanings was basically centered on isolated white teeth while the positional analysis have been hypothesized using ornithischian dinosaurs given that a design

not, these types of meanings was basically centered on isolated white teeth while the positional analysis have been hypothesized using ornithischian dinosaurs given that a design

callenderi was in fact really-revealed (Heckert, 2002 ; Look, 1989 ; See & Lucas, 1994 ; Padian, 1990 ). That have numerous enamel bearing factors with in-situ teeth now allows a sophistication from prior really works. Take a look ( 1989 ) was correct from inside the recognize premaxillary white teeth out of maxillary teeth. Yet ,, pearly whites such as those regarding premaxilla (Figures 4e, f), characterized by getting symmetrical mesiodistally and you may lingually curved at the top, are also based in the anterior portion of the dentary. Maxillary (Numbers 4g, h) and you may dentary pearly whites (Contour 5d) for the positions rear into the 3rd enamel are practically shaped mesiodistally, however, either are lingually rounded on apex, labiolingually compressed, and have now large prolonged crowns. The form of one’s maxillary and dentary teeth may vary positionally without a great discernable pattern, possibly related to enamel replacement.

Tooth off R

The newest anterior deal with of one’s atlantal intercentrum was busted away, but the rear 1 / 2 of this new feature was well-preserved. Inside posterior have a look at (Figure 8c), the new function is subrectangular having slight dorsoventral constrictions along side midline. The new atlantal intercentrum is actually concave dorsally in which they articulates towards the atlantal pleurocentrum. It articulates towards axial pleurocentrum which have a flat seat-formed facial skin (Figure 8d). The fresh ventral facial skin of your own atlantal intercentrum was excavated by the a great deep depression bordered by a sharp prior ridge. The brand new horizontal surface is incised by a deep dorsoventrally founded sulcus you to definitely shape anteriorly in the their dorsal the total amount. The lateral and you can ventral despair aren’t utilized in phytosaurs (e.grams., Machaeroprosopus mccauleyi, PEFO 31219), where the atlantal intercentrum try otherwise very similar to regarding R. callenderi.

5.6.step 1 Atlas-axis complex

The latest atlantal pleurocentrum, intercentrum, and you may neurapophysis are present (Figures 8a–c). New prezygapophysis of your own atlantal neurapophysis is a small anteriorly-projecting circular projection (Figure 8a). In phytosaurs (age.g., PEFO 31219) and you will crocodylomorphs (Brochu, 1992 ), the fresh prezygapophysis grows a lot more laterally. This new postzygapophysis was long and you may surge-including and you may methods posterodorsally. Extending medially in the zygapophyses is actually an over-all thin flange that versions this new roof of the sensory canal.

The new atlantal pluerocentrum (Figure 8b) is crescentic in prior and rear feedback, in place of in the phytosaurs, where it is square inside prior consider (e.grams., PEFO 31219). The anterior and you will rear counters was convex, although anterior articular face are some compliment and you will large than just new rear articular face. New rear articular deal with and has a low dorsoventrally popular sulcus you to definitely is also included in phytosaurs (e.grams., PEFO 31219). The brand new dorsal skin of atlantal pleurocentrum try concave and you can mediolaterally doubly large while the anteroposteriorly much time. Proportionally, the fresh new atlantal pleurocentrum from Roentgen. callenderi was anteroposteriorly quicker as compared to same consider L. meadei (TMM 31185–97) and you may T. coccinarum (AMNH 7634), or even they are comparable.

5.5 Postcrania Separated and you may associated postcranial factors are all on quarries from the PFV 297 and PFV 414. An educated-preserved bones is that from PEFO 34561, that’ll supply the cause for the fresh reconstruction (Shape seven) and you will dysfunction, together with other specimens supplementing the new description in which noted. 5.6 Axial skeleton

Brand new axial intercentrum is not recognized out of people specimen. The fresh new axial pleurocentrum (Profile 8d) out-of R. callenderi is approximately equant in dimensions. The anterior articular deal with are dorsally concave in which it articulates that have the fresh new atlantal elements; ventral to that particular area the newest articular deal with was flat and you can mountains posteroventrally where it could articulate into the axial intercentrum. The brand new horizontal corners of anterior articular face of one’s axial pleurocentrum try offered because margins abut on parapophyses. The parapophyses has flat articular surfaces, is raised for the collection of pedestals, and you may face posterolaterally. Brand new diapophyses form a curved point one faces posterolaterally and you will slightly ventrally. The newest horizontal skin of centrum and has an intense fossa posterior to the parapophysis. Which fossa try proportionally higher compared to L. meadei (TMM 31185-97) otherwise T. coccinarum (AMNH 7634), although depth associated with fossa changes as a result of ontogeny various other archosaurs (Irmis, 2007 ) and that is missing in certain aetosaurs (Desojo et al., 2012 ). The newest ventral epidermis of your axis centrum and it has a-sharp median ventral keel. That is missing inside the L. meadei.