By P.J. Currie, W. Langston, D.H. Tanke
Within the first monographic therapy of a horned (ceratopsid) dinosaur in virtually a century, this enormous quantity offers one of many closest seems on the anatomy, relationships, progress and version, habit, ecology and different organic features of a unmarried dinosaur species. The examine, which used to be carried out over 20 years, was once attainable a result of discovery of a densely packed bone mattress close to Grande Prairie, Alberta. The locality has produced considerable continues to be of a brand new species of horned dinosaur (ceratopsian), and elements of no less than 27 person animals have been recovered. This new species of Pachyrhinosaurus is heavily concerning Pachyrhinosaurus canadensis, that's identified from more youthful rocks close to Drumheller and Lethbridge in southern Alberta, yet is a smaller animal with many alterations within the decorative spikes and bumps at the cranium. The adults of either species have gigantic bosses of bone within the positions the place different horned dinosaurs (like Centrosaurus and Triceratops) have horns. even though, juveniles of the recent species resemble juveniles of Centrosaurus in having horns instead of bosses. cranium anatomy undergoes awesome adjustments in the course of development and the horns over the nostril and eyes of the Pachyrhinosaurus juveniles remodel into bosses; spikes and horns improve at the best of and in the back of the frill that extends again over the neck. No reason has been made up our minds for the plain catastrophic loss of life of the herd of Pachyrhinosaurus from the Grande Prairie zone, however it has been instructed that such herds can have been migratory animals. as well as the most descriptive paper, the quantity comprises info at the distribution of bones in the bone mattress itself, and a state of the art electronic remedy of CT-scan information of the fossils to bare the anatomy of the animal's mind.
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Additional resources for A New Horned Dinosaur From an Upper Cretaceous Bone Bed in Alberta
Lakustai show any indication of prefrontal or frontal involvement in the boss. 206 (Figs. 918, the sutures at the back of the nasal bosses for the prefrontals and frontals are clearly visible. The skulls, disarticulated nasal bosses and supraorbital bosses show that the prefrontals thicken anteriorly and butt into depressions on the posteroventral margins of the nasal bosses. There is some indication that the suture may be partially closed sometimes. However, because the prefrontals and frontals do not take part in the formation of the boss in P.
The dorsoposterior flange extends posteriorly to contact the lacrimal as in most other centrosaurines, although occasionally (AMNH 5351, Centrosaurus nasicornis), a nasal-maxillary contact prevents the premaxilla from reaching the lacrimal. Rostral Comb A unique and variable feature of at least some adult individuals of P. lakustai is what we term the rostral comb (Fig. 9). In well-developed examples, the rostra I comb comprises two or three massive anteriorly directed hook-like projections that are arranged in tandem on the narial bridge.
A ll/adel/sis, bur is prescnr in CelltrosflllrJ/s. Fig. 17. Pachyrlllnosaurus lakust'lI, p05torbita/s. 149 ill cm55 51"(:/;0 11 (C). 55. 127. uil'W$ of • A New Horned Dinosaur From an Upper Cretaceous Bonc Bed in Alberta . 35 Lacrilltal The lacnmal has been only panly defined in previously described cOllodclIsis skulls; slltures drawn by von Hucnc (1950) on a sketch of a /J. COllodensis skull (CMN 8867) are largely fanciful. Dissocirned left lacrimals (Fig. 20) resemble that of CelltrosmlTllS and display similar relationships to adjoining elements.
A New Horned Dinosaur From an Upper Cretaceous Bone Bed in Alberta by P.J. Currie, W. Langston, D.H. Tanke