Albertosaurinae [SEP] parent taxon
of the theropod family Tyrannosauridae, in the subfamily Albertosaurinae. Its closest relative is the slightly 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 Thomas Holtz found "Appalachiosaurus" to be an albertosaurine in 2004, but his more recent unpublished work locates it just outside Tyrannosauridae, in agreement with other authors.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, including genera such as "Daspletosaurus", "Tarbosaurus
New Mexico and elsewhere in North America may help clarify the situation. Gregory S. Paul has suggested that "Gorgosaurus libratus" is ancestral to "Albertosaurus sarcophagus".
Classification and systematics Phylogeny.
Albertosaurinae is a basal subfamily of tyrannosaurid. They were recognized in the 2014 analysis of the new genus "Nanuqsaurus", a derived tyrannosaurine, the sister group to Albertosaurinae. Albertosaurinae was recovered as including only "Albertosaurus" and "Gorgosaurus". "Albertosaurus" and "Gorgosaurus" are kept separate by most classifications, as should