 A 2003 attempt by Christopher Brochu included Albertosaurus , Alectrosaurus , Alioramus , Daspletosaurus , Gorgosaurus , Tarbosaurus and Tyrannosaurus in the definition . Holtz redefined the clade in 2004 to use all of the above as specifiers except for Alioramus and Alectrosaurus , which his analysis could not place with certainty . However , in the same paper , Holtz also provided a completely different definition , including all theropods more closely related to Tyrannosaurus than to Eotyrannus . The most recent definition is that of Sereno in 2005 , which defined Tyrannosauridae as the least inclusive clade containing Albertosaurus , Gorgosaurus and Tyrannosaurus . 
