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

ISBN-10: 0660198193

ISBN-13: 9780660198194

Within the first monographic therapy of a horned (ceratopsid) dinosaur in nearly a century, this enormous quantity offers one of many closest appears to be like on the anatomy, relationships, development and edition, habit, ecology and different organic elements of a unmarried dinosaur species. The study, which was once carried out over twenty years, was once attainable as a result of 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 components of a minimum of 27 person animals have been recovered. This new species of Pachyrhinosaurus is heavily regarding Pachyrhinosaurus canadensis, that is recognized from more youthful rocks close to Drumheller and Lethbridge in southern Alberta, yet is a smaller animal with many ameliorations within the decorative spikes and bumps at the cranium. The adults of either species have enormous bosses of bone within the positions the place different horned dinosaurs (like Centrosaurus and Triceratops) have horns. although, juveniles of the recent species resemble juveniles of Centrosaurus in having horns instead of bosses. cranium anatomy undergoes striking adjustments in the course of progress and the horns over the nostril and eyes of the Pachyrhinosaurus juveniles remodel into bosses; spikes and horns strengthen at the best 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 prompt that such herds can 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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Additional info for A New Horned Dinosaur From an Upper Cretaceous Bone Bed in Alberta

Sample text

As in in/tlleral (A). ws. ArrDIII Ache/oltsaur/ls, EillioSOIlYIIS, and P. :s/TII . an(1 is essentially featureless larerally. The bone is traversed by several deep, narrow subparallcl radiating sulci rhat pass anrerovemraJly from inside the orbit to emerge onto rhe lateral surface (Fig. I8A), where they impart a wrinkled appearance ({) the edge of the orbit. One prominent groove continues anteriorly for mOSt of the length of each of the lacrimals (Fig. ISA). No crater-like excavation nasal as occurs in AchelousflurtfS is present on the side of the lacrimal.

Seen from above, the palpebral is roughl), triangular as in Achelo/lsollrl/S (Sam pson 1995 ), Eilliosallrus (Sarnpson 1995), .. MOl/odol/ills lowei" (Sternberg 1940) and marurc specimens of I'ig. 2 1. 105) III dorslIl (A). velllml (8), ulIll /aleral (C) I/iews. Tht! JJet/ arrow silolt'S liJe ill/leliOIl where Ihe palpebrlll. frolllill. wl/l ,'{)$/Qrbillll meet. 1. 1; Srernberg 1927). The palpebrals of a subadlllt specimen of cf. 1 ) are more rounded and elo nga te. Whereas th e dorsal s urface is relatively flat in P.

The central part of this area includes a large gomphosis (peg-and-socket joint) with the jugal (Fig. 18C). These complicated joints permitted ontogenetic enlargement of the orbit, helped distribute stresses emanating from the nasofrontal region, and restricted deformation of the side of the face and orbit. A broadly rounded notch in the anteroventral edge of the lacrimal forms the posterodorsal margin of a small antorbital fenestra, which has also been called the preorbital fossa or the intra orbital foramen.

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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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