Currently, just one species is known: Daspletosaurus torosus. However, it is likely that there are more species that are yet to be described including one from Dinosaur Provincial Park here in Alberta .
Unfortunately, the exact position of Daspletosaurus within the Tyrannosauridae is not clear, especially with these undescribed species. It has been suggested that Daspletosaurus is actually the most closely related dinosaur to Tyrannosaurus (or to the Tyrannosaurus + Tarbosaurus group) .
|Artists impression of Daspletosaurus torosus by Steveoc 86|
|A Daspletosaurus eating a ceratopsian. Image credit to Dmitry Bogdanov|
Other 'D' dinosaurs from Alberta
1. Currie, PJ. 2003. Cranial anatomy of tyrannosaurid dinosaurs from the Late Cretaceous of Alberta, Canada. Acta Palaeontologica Polonica 48: 191-226. Download here
2. Carr, TD., Williamson, TE., and Schwimmer, DR. 2005. A new genus and species of tyrannosauroid from the Late Cretaceous (Middle Campanian) Demopolis Formation of Alabama. Journal of Vertebrate Paleontology 25: 119-143.
More information can be found at the Saurian blog on Daspletosaurus