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

ISBN-10: 0660198193

ISBN-13: 9780660198194

Within the first monographic remedy of a horned (ceratopsid) dinosaur in virtually a century, this enormous quantity provides one of many closest appears to be like on the anatomy, relationships, progress and edition, habit, ecology and different organic elements of a unmarried dinosaur species. The learn, which used to be carried out over 20 years, was once attainable due to 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 elements of no less than 27 person animals have been recovered. This new species of Pachyrhinosaurus is heavily concerning 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 great bosses of bone within the positions the place different horned dinosaurs (like Centrosaurus and Triceratops) have horns. although, juveniles of the hot species resemble juveniles of Centrosaurus in having horns instead of bosses. cranium anatomy undergoes impressive alterations in the course of progress 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 obvious catastrophic dying of the herd of Pachyrhinosaurus from the Grande Prairie region, however it has been prompt 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 remedy 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

Example text

Three to five irregular but well-defined deep pits are always found on the ventral surface of the prefrontal posterior to this ridge (Figs. 19C, 19E). The contact with the nasal (Fig. 20) consists of a relatively wide, deeply marked surface with multiple socket-like excavations on the ventral surface that evidently received corresponding projections of bone from the nasal. These excavations are inclined upward and forward at an angle of about 45° to the surface. Lateral to this powerful region of contact is a more limited, virtually smooth surface.

Uil'W$ of • A New Horned Dinosaur From an Upper Cretaceous Bonc Bed in Alberta . 35 Lacrilltal The lacnmal has been only panly defined in previously described cOllodclIsis skulls; slltures drawn by von Hucnc (1950) on a sketch of a /J. COllodensis skull (CMN 8867) are largely fanciful. Dissocirned left lacrimals (Fig. 20) resemble that of CelltrosmlTllS and display similar relationships to adjoining elements. It is 1I10rc masFig. 1'3ch),rhinoS:lllrHS lakuswi. jj. J8 1) bone comprises less than one-quarter of the run of the orbit.

The external surfaces are smooth and are not textured like the surface of the nasal boss as they are in P. canadensis. The "fist-sized knob" (Fig. 6D) of P. canadensis (Sternberg 1950), a possible osteoderm, has not been identified in P. lakustai. The posterodorsal rim of the external naris, which is formed by the nasal, flares laterally and is continuous ventrally with the distinctive long finger-like intranarial process (Langston 1975). This process is less strongly developed than in P. canadensis (Fig.

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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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