callenderi was basically better-described (Heckert, 2002 ; Appear, 1989 ; Take a look & Lucas, 1994 ; Padian, 1990 ). Having numerous enamel impact facets within-situ pearly whites now allows a sophistication regarding earlier work. Take a look ( 1989 ) is correct into the recognize premaxillary teeth off maxillary pearly whites. Yet ,, teeth like those regarding premaxilla (Rates 4e, f), described as are symmetric mesiodistally and you will lingually curved in the apex, are found in the anterior part of the dentary. Maxillary (Rates 4g, h) and you can dentary white teeth (Figure 5d) in ranking rear into the 3rd enamel are practically symmetrical mesiodistally, but often is lingually curved during the top, labiolingually compressed, and now have large expanded crowns. The proper execution of your maxillary and you will dentary pearly whites may differ positionally instead of a discernable development, possibly pertaining to enamel replacement for.
The teeth from R
Brand new prior deal with of your own atlantal intercentrum try broken aside, but the rear 50 % of the latest function are well-preserved. During the posterior look at (Shape 8c), the element try subrectangular that have slight dorsoventral constrictions along the midline. The atlantal intercentrum was concave dorsally where it articulates towards the atlantal pleurocentrum. It articulates to the axial pleurocentrum with a flat saddle-formed facial skin (Profile 8d). The fresh new ventral skin of one’s atlantal intercentrum are excavated of the an effective deep despair bordered by a-sharp anterior ridge. Brand new lateral facial skin try datingranking.net/tr/collarspace-inceleme/ incised from the an intense dorsoventrally situated sulcus one contours anteriorly from the the dorsal the total amount. Both horizontal and you can ventral depression commonly included in phytosaurs (elizabeth.g., Machaeroprosopus mccauleyi, PEFO 31219), where the atlantal intercentrum try if not much like regarding R. callenderi.
5.six.step one Atlas-axis complex
The newest atlantal pleurocentrum, intercentrum, and you may neurapophysis exist (Numbers 8a–c). The newest prezygapophysis of one’s atlantal neurapophysis try a little anteriorly-projecting circular projection (Shape 8a). Inside phytosaurs (age.grams., PEFO 31219) and crocodylomorphs (Brochu, 1992 ), brand new prezygapophysis increases way more laterally. The newest postzygapophysis was enough time and you may surge-for example and you may programs posterodorsally. Stretching medially from the zygapophyses is actually a broad slim flange one versions the newest roof of your own sensory canal.
The fresh new atlantal pluerocentrum (Profile 8b) try crescentic into the anterior and posterior views, instead of in phytosaurs, where it’s rectangular into the prior evaluate (e.grams., PEFO 31219). The prior and you will posterior surfaces is actually convex, though the prior articular face try some compliment and you can broad than the new posterior articular deal with. The newest rear articular face features a shallow dorsoventrally trending sulcus that is additionally used in phytosaurs (e.g., PEFO 31219). The brand new dorsal surface of one’s atlantal pleurocentrum is concave and you can mediolaterally doubly large while the anteroposteriorly enough time. Proportionally, the latest atlantal pleurocentrum from Roentgen. callenderi is actually anteroposteriorly quicker versus exact same aspect in L. meadei (TMM 31185–97) and you may T. coccinarum (AMNH 7634), if you don’t he’s very similar.
5.5 Postcrania Separated and you may associated postcranial aspects are on the quarries within PFV 297 and you can PFV 414. The best-kept skeleton would be the fact off PEFO 34561, that will deliver the basis for the fresh new repair (Profile eight) and breakdown, along with other specimens supplementing the brand new breakdown where detailed. 5.six Axial skeleton
The fresh axial intercentrum isn’t understood regarding people sample. New axial pleurocentrum (Contour 8d) out of Roentgen. callenderi is approximately equant in its size. New anterior articular deal with are dorsally concave in which it articulates that have the fresh atlantal points; ventral to that particular town the latest articular face is actually flat and you can hills posteroventrally in which it might articulate into the axial intercentrum. The brand new horizontal edges of your prior articular face of your own axial pleurocentrum was longer just like the margins abut into parapophyses. New parapophyses possess apartment articular surfaces, are increased into the distinctive line of pedestals, and you can deal with posterolaterally. The diapophyses form a rounded part you to definitely faces posterolaterally and you will a little ventrally. This new horizontal facial skin of your own centrum and has now a-deep fossa posterior with the parapophysis. So it fossa are proportionally higher compared to L. meadei (TMM 31185-97) or T. coccinarum (AMNH 7634), although depth on the fossa transform by way of ontogeny in other archosaurs (Irmis, 2007 ) and that’s missing in a few aetosaurs (Desojo ainsi que al., 2012 ). The brand new ventral body of axis centrum and contains a-sharp average ventral keel. It is missing when you look at the L. meadei.