By P.J. Currie, W. Langston, D.H. Tanke
Within the first monographic therapy of a horned (ceratopsid) dinosaur in virtually a century, this enormous quantity provides one of many closest appears on the anatomy, relationships, development and edition, habit, ecology and different organic features of a unmarried dinosaur species. The examine, which used to be carried out over twenty years, was once attainable a result of 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 components of at the least 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 modifications within the decorative spikes and bumps at the cranium. The adults of either species have tremendous bosses of bone within the positions the place different horned dinosaurs (like Centrosaurus and Triceratops) have horns. even though, juveniles of the recent species resemble juveniles of Centrosaurus in having horns instead of bosses. cranium anatomy undergoes notable alterations in the course of progress and the horns over the nostril and eyes of the Pachyrhinosaurus juveniles rework into bosses; spikes and horns enhance at the most sensible of and behind the frill that extends again over the neck. No reason has been decided for the obvious catastrophic demise of the herd of Pachyrhinosaurus from the Grande Prairie quarter, however it has been advised that such herds could have been migratory animals. as well as the most descriptive paper, the amount comprises info 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
On the right side, there is only a suggestion of the marginal horn-like rim seen in larger skulls. The mass of the boss, which resembles a flattened pillow, overhangs the subjacent prefrontal and frontal bones posteriorly (Fig. 131). This is the position of the transverse tunnel seen in the Drumheller skull (Langston 1967). The superior surface of this boss is occupied by broad low hummocks, and a thick sagittal ridge rises above the general level of the top of the boss. The internal (ventral) surface of this boss is well preserved and is comprised of the paired nasal bones, whose sagittal suture remains open in this aspect.
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.
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. They constitute the contact surfaces for attachment of the greatly thickened lacrimal in front and the prefrontal behind. That the contact surfaces for the prefrontals do not meet posteriorly at the midline suggests that an anterior wedge of the frontals made contact with the nasals beneath the posterior edge of the boss.
A New Horned Dinosaur From an Upper Cretaceous Bone Bed in Alberta by P.J. Currie, W. Langston, D.H. Tanke