Yet not, these descriptions was basically considering remote white teeth together with positional study had been hypothesized having fun with ornithischian dinosaurs as the a product

    Yet not, these descriptions was basically considering remote white teeth together with positional study had been hypothesized having fun with ornithischian dinosaurs as the a product

    callenderi was well-discussed (Heckert, 2002 ; Take a look, 1989 ; Check & Lucas, 1994 ; Padian, 1990 ). With several enamel results elements within-situ teeth now lets a refinement of early in the day work. Check ( 1989 ) is actually correct for the distinguishing premaxillary teeth out-of maxillary teeth. But really, teeth like those on premaxilla (Numbers 4e, f), characterized by becoming symmetrical mesiodistally and you can lingually curved during the apex, are found in the prior portion of the dentary. Maxillary (Numbers 4g, h) and you can dentary teeth (Contour 5d) when you look at the positions posterior towards third enamel are almost shaped mesiodistally, but often was lingually curved on top, labiolingually compacted, and then have higher stretched crowns. The form of your own maxillary and you may dentary white teeth may differ positionally in place of a good discernable trend, possibly associated with tooth substitute for.

    One’s teeth out of Roentgen

    The brand new prior face of your own atlantal intercentrum is damaged out, but the rear half of the newest ability are well preserved. In the posterior view (Contour 8c), the newest ability is subrectangular which have slight dorsoventral constrictions along side midline. The latest atlantal intercentrum try concave dorsally where it articulates on atlantal pleurocentrum. It articulates toward axial pleurocentrum which have a flat saddle-formed facial skin (Shape 8d). Brand new ventral surface of atlantal intercentrum are excavated by an effective deep anxiety bordered of the a sharp prior ridge. The latest lateral skin is actually incised because of the a deep dorsoventrally situated sulcus that contours anteriorly during the its dorsal the total amount. Both lateral and you will ventral despair aren’t included in phytosaurs (age.grams., Machaeroprosopus mccauleyi, PEFO 31219), where in actuality the atlantal intercentrum is if you don’t much like that R. callenderi.

    5.6.step one Atlas-axis state-of-the-art

    The fresh new atlantal pleurocentrum, intercentrum, and you can neurapophysis occur (Numbers 8a–c). The fresh new prezygapophysis of your own atlantal neurapophysis are a tiny anteriorly-projecting rounded projection (Shape 8a). Into the phytosaurs (elizabeth.grams., PEFO 31219) and you may crocodylomorphs (Brochu, 1992 ), this new prezygapophysis increases a great deal more sideways. The newest postzygapophysis is actually enough time and surge-eg and you may programs posterodorsally. Stretching medially in the zygapophyses are a broad slim flange one versions the fresh new roof of one’s neural canal.

    The brand new atlantal pluerocentrum (Figure 8b) are crescentic inside the prior and posterior views, in the place of during the phytosaurs, where it is rectangular in the anterior look at (e.grams., PEFO 31219). Both the prior and you will posterior counters try convex, although the prior articular face was a bit flatter and broad than just brand new posterior articular deal with. New posterior articular deal with and has a low dorsoventrally trending sulcus you to definitely is even included in phytosaurs (e.g., PEFO 31219). The dorsal epidermis of your atlantal pleurocentrum is actually concave and you can mediolaterally doubly greater while the anteroposteriorly a lot of time. Proportionally, the latest atlantal pleurocentrum from Roentgen. callenderi was anteroposteriorly quicker compared to same element in L. meadei (TMM 31185–97) and you may T. coccinarum (AMNH 7634), if not he could be much the same.

    5.5 Postcrania Remote and you will related postcranial issue are common from the quarries at the PFV 297 and PFV 414. A knowledgeable-maintained bones is the fact of PEFO 34561, that may deliver the cause for the new repair (Profile 7) and you may breakdown, with other specimens complementing the newest breakdown where indexed. 5.6 Axial bones

    The fresh new axial intercentrum is not identified from people specimen. The axial pleurocentrum (Profile 8d) of Roentgen. callenderi is roughly equant within the size. The fresh new prior articular deal with is actually dorsally concave where they articulates that have the fresh atlantal issue; ventral compared to that urban area the fresh new articular deal with try apartment and you may mountains posteroventrally in which it could articulate towards axial intercentrum. Brand new horizontal sides of your own anterior articular deal with of your axial pleurocentrum is stretched as the margins abut into parapophyses. The parapophyses have flat articular surfaces, is increased on type of pedestals, and you may face posterolaterally. The latest diapophyses setting a curved part that face posterolaterally and you may a bit ventrally. The latest lateral facial skin of your centrum and also a deep fossa rear with the parapophysis. This fossa was proportionally better compared to L. meadei (TMM 31185-97) or T. coccinarum (AMNH 7634), although depth of the fossa change thanks to ontogeny various other archosaurs (Irmis, 2007 ) that will be missing in some aetosaurs (Desojo mais aussi al., 2012 ). The latest ventral skin of one’s axis centrum and contains a sharp average ventral keel. This is absent in L. meadei.



    The current query has no posts. Please make sure you have published items matching your query.