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

Within the first monographic remedy of a horned (ceratopsid) dinosaur in nearly a century, this enormous quantity provides 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 examine, which used to be performed over 20 years, was once attainable as a result 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 not less than 27 person animals have been recovered. This new species of Pachyrhinosaurus is heavily regarding Pachyrhinosaurus canadensis, that's identified from more youthful rocks close to Drumheller and Lethbridge in southern Alberta, yet is a smaller animal with many adjustments within the decorative spikes and bumps at the cranium. The adults of either species have sizeable bosses of bone within the positions the place different horned dinosaurs (like Centrosaurus and Triceratops) have horns. besides the fact that, juveniles of the recent species resemble juveniles of Centrosaurus in having horns instead of bosses. cranium anatomy undergoes impressive adjustments in the course of development and the horns over the nostril and eyes of the Pachyrhinosaurus juveniles rework into bosses; spikes and horns improve at the best of and behind the frill that extends again over the neck. No reason has been decided for the plain catastrophic loss of life of the herd of Pachyrhinosaurus from the Grande Prairie quarter, however it has been recommended 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

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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. The sutures with the prefrontal and frontal are found at the base of the uiangular area, suggesting Ihal the frontal may have extended farther forward than in other centrosaurines (except vicw, 32 • Chapter 1: Currie, Langsron, and Tankc Achelousaurus) and (or) that the base of the horn extended farther posteriorly on the nasal than usual.

Pseudotemporalis. Another triangular space dorsomedial to the socket for the dorso-anterolateral buttress of the laterospenoid represents the roof of the frontal sinus. 46 • Chapter 1: Currie, Langston, and Tanke The "transverse tunnel" produced by overgrowth of the postorbital exostosis described in the Drumheller skull (Langston 1967) is undeveloped in P. lakustai. Whether this difference is systematically important or is a result of differing ontogenetic stages is unknown. Supraorbital boss The flattened, circular supraorbital boss (Figs.

The differences may also reflect sexual dimorphism. 30 • Chapter 1: Currie, Langston, and Tanke The supranasal boss (Fig. 6D) of P. canadensis has a massive, flattened, tumescent bulge on either side of a wide midlongitudinal sulcus immediately anterolateral to the nasal boss. This is absent in p. lakustai, although the opposing premaxillary processes of the nasal bones are thickened longitudinally to form a blunt-ended cylindrical mass. The external surfaces are smooth and are not textured like the surface of the nasal boss as they are in P.

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