Read e-book online A New Horned Dinosaur From an Upper Cretaceous Bone Bed in PDF
By P.J. Currie, W. Langston, D.H. Tanke
Within the first monographic therapy of a horned (ceratopsid) dinosaur in nearly a century, this enormous quantity provides one of many closest seems to be on the anatomy, relationships, development and edition, habit, ecology and different organic points of a unmarried dinosaur species. The study, which was once carried out over twenty years, was once attainable end result of the 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 no less than 27 person animals have been recovered. This new species of Pachyrhinosaurus is heavily relating to Pachyrhinosaurus canadensis, that's identified from more youthful rocks close to Drumheller and Lethbridge in southern Alberta, yet is a smaller animal with many modifications within the decorative spikes and bumps at the cranium. The adults of either species have large bosses of bone within the positions the place different horned dinosaurs (like Centrosaurus and Triceratops) have horns. even if, 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 obvious catastrophic demise of the herd of Pachyrhinosaurus from the Grande Prairie region, however it has been advised that such herds could have been migratory animals. as well as the most descriptive paper, the quantity comprises details at the distribution of bones in the bone mattress itself, and a state of the art electronic therapy of CT-scan facts of the fossils to bare the anatomy of the animal's mind.
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Extra info for A New Horned Dinosaur From an Upper Cretaceous Bone Bed in Alberta
Firmly fused to the premaxillae. The rostral is broader than might be inferred from the tr:lnsversely compressed skulls from Pipcstone Creek (Fig. 10E). The lateral profile is variable, and some roStra Is (such as that of the holotype) appear more hooked and beak-like than others (Figs. 7-9). The lingual surfaces that opposed the predentary, and were presumably horn covered, arc broad and separated in part by a low ovate median tubercle (Fig. tOE). Anreriorly, the external surface is deeply sculptured by short chaotic pits and grooves, which grade posteriorly into a Illore regular pattern of suhparallel anteroposterior anastomosing sulci that are perpend icular to the border with the premaxillae.
_'\ naris ". ~. , . II,'~' "---"'~, ... ~,. , , •• '. '\. '- --- ... G naris , --. , . ~. '/' Fig. 15. i bones of /"lIImile 10 yOl1l/1; ad.. 48. xIIIII/lle. right side (anterior to the right). (8, C. 80 iI, fe(llatt'ral (atllcrior /0 the left), left medial. am/ anlerior aspel:ts. 55. 256. 1342 ill left ialmll A pronounced change of plain occurs in the lateral surface of the nasal posteriorly along a sulcus from the edge of the nasal to the top of the horn. This resu lts posteriorly in a flat, deeply sculptured triangular area tha r is obfUscly deflected mesad.
A 8 Scm Frontal bones are difficu lt to define in large ceratopsid skulls, where they fuse into the postorbital and p refrontal. rOsaurus and StyracosClurus (Sampson 1995 ), extends into a si nu s system (s uprac ra llial cavity) that in va des the sLlpraorb irai horn or boss in P. ai, Einiosaurus, and P. canadensis. This indicates that there is co nside rable resorprion and restructuring inside the fronta l during ontogeny. 369 (F ig. 22), are rare. The fronta ls took no part in th e na sa l boss in P.
A New Horned Dinosaur From an Upper Cretaceous Bone Bed in Alberta by P.J. Currie, W. Langston, D.H. Tanke