Download PDF by P.J. Currie, W. Langston, D.H. Tanke: A New Horned Dinosaur From an Upper Cretaceous Bone Bed in

By P.J. Currie, W. Langston, D.H. Tanke

ISBN-10: 0660198193

ISBN-13: 9780660198194

Within the first monographic therapy 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 edition, habit, ecology and different organic points of a unmarried dinosaur species. The examine, which used to be performed over 20 years, was once attainable as a result of the discovery of a densely packed bone mattress close to Grande Prairie, Alberta. The locality has produced considerable is still 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 regarding Pachyrhinosaurus canadensis, that is identified from more youthful rocks close to Drumheller and Lethbridge in southern Alberta, yet is a smaller animal with many transformations within the decorative spikes and bumps at the cranium. The adults of either species have immense bosses of bone within the positions the place different horned dinosaurs (like Centrosaurus and Triceratops) have horns. in spite of the fact that, juveniles of the recent species resemble juveniles of Centrosaurus in having horns instead of bosses. cranium anatomy undergoes notable alterations in the course of development and the horns over the nostril and eyes of the Pachyrhinosaurus juveniles remodel into bosses; spikes and horns enhance at the most sensible of and behind the frill that extends again over the neck. No reason has been decided for the obvious catastrophic dying of the herd of Pachyrhinosaurus from the Grande Prairie quarter, 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 therapy of CT-scan info 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

Sample text

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. urincs (Fig. 9). Along with the premaxillae, the rostra I forms rhe disrinctive '"rosrral comb" that will be described subsequent to the description of the premaxilla.

Canadensis (Langsron 1975 ) and 1'. 367, Fig. 808, Fig. 1131, Figs. 23A, 238). Dimensions a nd surura l edges on the prefrontals of P. lakustai show that these bones we re separated medially by the fromals. In a large P. 111, Fig. 8E) in wh ich the "sponge-s haped " supraorbital bosses a rc well developed, the fronta l forms part of the med ial side of eac h boss, si mila r to Achelotfsaurus and P. canadensis. Dorsally, the frontal extends poster iorl y to overlap the anterolaterally d irected ramus of the parietal, therehy excluding the posto rbital s from the mid line (Sa mpson 1995).

206. Except for the appearance of the rostral comb in some adults and substantial thickening throughout the bonc with increasing size, growth of the premaxilla appears to have been FIg. /1. 'lUTUS lnkusrai prcmaxillne. J1 view; (DJ sl/bad"l( illdilJU/III1I. 153, right IlIter,,1 view (""terlor il t the rigbt). A New Horned Dinosaur From an Upper Cretnceous Bone Bed in Albcrrn • 23 isometric. The architecture of the premaxilla provides an important means of distinguishing between chasmosaurine and centrosaurine cera top sids (Dodson and Currie 1990; Lehman 1990; Dodson et al.

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A New Horned Dinosaur From an Upper Cretaceous Bone Bed in Alberta by P.J. Currie, W. Langston, D.H. Tanke

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