Download A New Horned Dinosaur From an Upper Cretaceous Bone Bed in by P.J. Currie, W. Langston, D.H. Tanke 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 offers one of many closest seems to be on the anatomy, relationships, progress and edition, habit, ecology and different organic elements of a unmarried dinosaur species. The study, which was once carried out over 20 years, was once attainable as 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 at the least 27 person animals have been recovered. This new species of Pachyrhinosaurus is heavily on the topic of Pachyrhinosaurus canadensis, that's 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 giant 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 rework 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 made up our minds for the plain catastrophic dying of the herd of Pachyrhinosaurus from the Grande Prairie region, however it has been recommended that such herds could have been migratory animals. as well as the most descriptive paper, the amount comprises 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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Extra info for A New Horned Dinosaur From an Upper Cretaceous Bone Bed in Alberta

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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. No such fearure is seen in Celllrosa llrlts or StyracosaufIIs, where the horns are transversely rounded.

31 A '" ....... '10. ' _'\ 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.

The ventral side of the boss is divisible into a low, broadly triangular central vault (Figs. BC, BD, BE, 13G, 13H), a long excavation at the posterolateral edge of the vault, and a smaller, diagonally ovate excavation posterior to each of the posterolateral excavations. The surface of the large median vault is smooth and consists of cortical bone. It roofed the relatively wide posterior narial space. The adjacent excavations are separated from the central vault by sharp irregular sutural edges.

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