Post by Theropod on Nov 6, 2013 13:54:15 GMT
Technical Session IX (Friday, November 1, 2013, 9:15 AM)
MIYASHITA, Tetsuto, University of Alberta, Edmonton, AB, Canada, T6G 2E9; CURRIE, Philip, University of Alberta, Edmonton, AB, Canada; PAULINA CARABAJAL, Ariana, CONICET-Museo Carmen Funes, Plaza Huincul, Argentina
Page 178, © 2013 by the Society of Vertebrate Paleontology.
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MIYASHITA, Tetsuto, University of Alberta, Edmonton, AB, Canada, T6G 2E9; CURRIE, Philip, University of Alberta, Edmonton, AB, Canada; PAULINA CARABAJAL, Ariana, CONICET-Museo Carmen Funes, Plaza Huincul, Argentina
"Many of the tyrannosaurines collected from the Campanian of western North America were identified as Daspletosaurus in the last four decades. In particular, discoveries of nearly a dozen well-preserved skulls and skeletons of Daspletosaurus from the Dinosaur Park and Oldman formations of Alberta led to the realization that these specimens represent a species distinct from the type Daspletosaurus torosus. The new species of Daspletosaurus can be defined on the basis of a nearly complete, three-dimensionally preserved, disarticulated skull (only missing the vomer) and an associated postcranial skeleton of an adult (Royal Tyrrell Museum of Palaeontology TMP 2001.36.1). The description is supplemented by information from juvenile and adult skulls and skeletons of the same species. The new species is distinguished from Daspletosaurus torosus by characters that include the supranarial process of the premaxilla extending posteriorly for more than half the diameter of the external naris, a lacrimal that is 1.5 times anteroposteriorly longer than dorsoventrally tall, a pronounced temporal margin of the postorbital, and a maxillary tooth count greater than 15. The new species is from the Dinosaur Park Formation and the chronologically equivalent part of the Oldman Formation, and lived more recently than Daspletosaurus torosus. Together with Daspletosaurus sp. from the Two Medicine Formation of Montana, these putative species of Daspletosaurus form a more derived assemblage of tyrannosaurines in a phylogenetic analysis than the Campanian tyrannosaurines from Utah and, possibly, New Mexico. The identification of multiple species of Daspletosaurus favors the generic separation of derived tyrannosaurines into Daspletosaurus, Tarbosaurus and Tyrannosaurus."
Page 178, © 2013 by the Society of Vertebrate Paleontology.
This is not mine, I just found it interesting and decided to share it with our community. Feel free to discuss below.