By P.J. Currie, W. Langston, D.H. Tanke
Within the first monographic remedy of a horned (ceratopsid) dinosaur in virtually a century, this enormous quantity offers one of many closest appears to be like on the anatomy, relationships, development and version, habit, ecology and different organic features of a unmarried dinosaur species. The learn, which was once performed over 20 years, used to be attainable as a result of discovery of a densely packed bone mattress close to Grande Prairie, Alberta. The locality has produced plentiful continues to be of a brand new species of horned dinosaur (ceratopsian), and components of at the least 27 person animals have been recovered. This new species of Pachyrhinosaurus is heavily relating to Pachyrhinosaurus canadensis, that's recognized from more youthful rocks close to Drumheller and Lethbridge in southern Alberta, yet is a smaller animal with many changes within the decorative spikes and bumps at the cranium. The adults of either species have mammoth bosses of bone within the positions the place different horned dinosaurs (like Centrosaurus and Triceratops) have horns. despite the fact that, 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 increase at the best of and behind the frill that extends again over the neck. No reason has been made up our minds for the plain catastrophic demise of the herd of Pachyrhinosaurus from the Grande Prairie sector, however it has been urged that such herds can have been migratory animals. as well as the most descriptive paper, the quantity contains details at the distribution of bones in the bone mattress itself, and a state-of-the-art electronic remedy of CT-scan facts of the fossils to bare the anatomy of the animal's mind.
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Additional info for A New Horned Dinosaur From an Upper Cretaceous Bone Bed in Alberta
Canadensis (Langston 1967). 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.
The co-ossified nasal and sLlpraorbital bosses are described separately within their units. Rostral The rostra I bone (Fig. 9) is variably attached to rhe premaxillae, and rhe two bones form the peculiar rostral comb in adults (described after the premaxilla). 50, Fig. 10) have well-defined, smoothly finished contact surfaces for the premaxi llae. - firmly fused to the premaxillae. The rostral is broader than might be inferred from the tr:lnsversely compressed skulls from Pipcstone Creek (Fig. 10E).
In its mature state, the boss of p. lakustai resembles that of P. canadensis, but it occupies a relatively smaller area of the skull roof in P. lakustai and does not contact the nasal boss anteriorly. In skulls of P. canadensis from Scabby Butte and Drumheller, the top of the boss is flat to slightly convex, and the bone is several centimetres thick at its center. In all Pipestone Creek specimens so far prepared, the top of the boss is depressed, and the roofing bone is thin comparable with conditions in the holotype of P.
A New Horned Dinosaur From an Upper Cretaceous Bone Bed in Alberta by P.J. Currie, W. Langston, D.H. Tanke