Albertosaurus older "Gorgosaurus libratus" (sometimes called "Albertosaurus libratus"; see below). These two species are the only described albertosaurines; other undescribed species may exist. Thomas Holtz found "Appalachiosaurus" to be an albertosaurine in 2004, but his more recent unpublished work locates it just outside Tyrannosauridae, in agreement with other authors. The other major subfamily of tyrannosaurids is the Tyrannosaurinae, which includes "Daspletosaurus", "Tarbosaurus" and "Tyrannosaurus". Compared with these robust tyrannosaurines, albertosaurines had slender builds, with proportionately smaller skulls and longer bones of the lower leg (tibia) and feet (metatarsals and phalanges). Below is the cladogram of the Tyrannosauridae based on the phylogenetic
Bones of the Dragon Bones of the Dragon Bones of the Dragon is the first book in the Dragonships series, written by the fantasy duo Margaret Weis and Tracy Hickman. It was released in hardcover on January 6, 2009. The book begins with the land of Vindrassi suffering from a great drought that has left the land parched and game scarce. Skylan Ivorson, the son of Norgaard, the Chief of the Torgun Tribe is leading a small hunting party to try to find some food. The group includes Skylan's best friend and confidant Garn, and the brothers Bjorn and Erdmun. Skylan is a young