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 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 version, habit, ecology and different organic facets of a unmarried dinosaur species. The study, which used to be carried out over twenty years, used to be attainable as a result of 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 components of not less than 27 person animals have been recovered. This new species of Pachyrhinosaurus is heavily relating to Pachyrhinosaurus canadensis, that's recognized 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 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 hot species resemble juveniles of Centrosaurus in having horns instead of bosses. cranium anatomy undergoes amazing adjustments in the course of development and the horns over the nostril and eyes of the Pachyrhinosaurus juveniles remodel into bosses; spikes and horns advance 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 demise of the herd of Pachyrhinosaurus from the Grande Prairie zone, however it has been recommended that such herds can have been migratory animals. as well as the most descriptive paper, the amount contains info at the distribution of bones in the bone mattress itself, and a state-of-the-art electronic remedy of CT-scan information 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 is also formed only by the nasals. In all probability, the transverse tunnel of Langston (1967) represents the division between the nasal and supra orbital bosses. These units may co-ossify in mature animals, but the nasal and supra orbital bosses only contact each other dorsal to the transverse tunnel. As pointed out by Langston (1967), the universal presence of this feature in well-preserved specimens suggests that some vital soft structure, such as a blood vessel and (or) nerve, was overgrown by the ornamentations.

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.

It is small and lozenge shaped; unlike epijugals in most ceratopsians, its longest diameter is more anteroposterior than dorsoventral. 4) of the Drumheller skull. 304), the tip of the bone has been resorbed in a manner similar to the nasal and supraorbital bosses (Tanke and Farke 2006). 5 cm wide at the base), triangular epijugal that appears to have been only partially fused to the jugal at the time of death. 55. 144; Fig. 26) from a probable adult individual. It is J 71 mm high and has a greatest mcdiolateral width at the back of the jugal suture of about 46 mm, rhe same as in a P.

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