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Albertosaurus

Albertosaurus is the group name for a number of species, including:

Albertosaurus libratus (Lambe, 1914)

Albertosaurus arctunguis (Parks, 1928)

Albertosaurus looked a lot like Tyrannosaurus, but they were smaller. Like Tyrannosaurus, they had small arms and a huge head with recurved serrated teeth. These teeth however, are more strongly curved than those of Tyrannosaurus. Unlike Tyrannosaurus, who evolved a lot, all the found specimens of Albertosaurus suggest that they didn't evolve much in over 10 million years, except for becoming a bit more gracile.