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

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

ISBN-10: 0660198193

ISBN-13: 9780660198194

Within the first monographic remedy of a horned (ceratopsid) dinosaur in virtually a century, this huge 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 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 ample 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 with regards to Pachyrhinosaurus canadensis, that is 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 substantial bosses of bone within the positions the place different horned dinosaurs (like Centrosaurus and Triceratops) have horns. notwithstanding, juveniles of the recent species resemble juveniles of Centrosaurus in having horns instead of bosses. cranium anatomy undergoes notable alterations in the course of progress and the horns over the nostril and eyes of the Pachyrhinosaurus juveniles remodel into bosses; spikes and horns boost at the most sensible of and in the back of the frill that extends again over the neck. No reason has been decided for the obvious catastrophic demise of the herd of Pachyrhinosaurus from the Grande Prairie region, however it has been urged that such herds could have been migratory animals. as well as the most descriptive paper, the quantity contains info 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 resources for A New Horned Dinosaur From an Upper Cretaceous Bone Bed in Alberta

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Canadensis skulls from Scabby Butte, similar features seem to be associated with the palisaded topography around the periphery of the bosses. 111 (Fig. 427 is pierced to enter the sinus underneath. These concavities are characteristic of large individuals of most centrosaurine species (Tanke and Farke 2006), including Centrosaurus and Styracosaurus (CMN 344), and represent resorption pits that develop at advanced age. The ridge-and-groove field probably represents a region of rapid growth, mobilized at a late juvenile stage, and development of the supraorbital bosses likely followed the same sequence as the nasal 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. lakustai, the structure is referred to as the nasal boss (as opposed to a A New Horned Dinosaur From an Upper Cretaceous Bone Bed in Alberta • 27 nasofrontal boss) in this paper.

1234, although the total count in both cases may have had a few more tooth positions. These numbers are comparable with other ceratopsids of similar size (25-28 in Achelousaurus, 2935 in Centrosaurus, 30 in Chasmosaurus, and 24-28 in Einiosaurus) A New Horned Dinosaur From an Upper Cretaceous Bone Bed in Alberta • 25 bm are lower than in the adults of larger ceratopsids, such as Tricerarops, which can have as many as 40 tooth positions. Clearly the number of tooth positions increased ontOgenetically as in protoceraropsians (Maryanska and Osm61ska 1975; Dung and Currie 1993), EilTiosallrllS (Sampsun '1993), ZIIJliceratops (Wolfe 2000), hadrosaurs (Horner and Currie 1994 ), and other ornithischians.

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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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