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 Thomas Holtz found "Appalachiosaurus" to be an albertosaurine in 2004, but his more recent unpublished work locates it just outside Tyrannosauridae, in agreement with other authors.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
The Bones of Zora of the cast, plot, and background are good." Don D'Ammassa, addressing this and other late entries in the "Viagens" series, writes "[t]he quality of the series remains undiminished in [these] volumes, which combine good-natured mayhem and a crisp, exciting narrative style. The main plot device of bickering male and female protagonists not destined for a happy ending together is featured in several late de Camp novels, notably "The Prisoner of Zhamanak" (1982), "The Incorporated Knight" (1987), and "The Pixilated Peeress" (1991). The Bones of Zora The Bones of Zora is a science fiction novel by American writers L. Sprague de