The Tyrannosaurid Family

II is by no means clear which animals truly belong to the tyrannosaurids. Several scientists are reviewing the fossil evidence now, and new finds are made all the time, so chances are this list, like all others, will soon be altered. For now, George Olshevsky lists the following genera and species of tyrannosaurids:

Albertosaurus megragracilis was named by artist Gregory Paul in 1988. This was a smaller, more lightly built species of albertosaur, still as big as a rhinoceros.

Albertosaurus sarcophagus was named by Henry Fairfield Osborn in 1905. It was smaller than T. rex, with a lower, longer snout and grew to twenty-six feet and two tons.

Daspletosaurus torosus was named by Dale Russell of Canada in 1970. A solidly built predator with a huge head, legs, and tail, it grew to twenty-eight feet and three tons.

A new "stretch-snouted" Daspletosaurus will be named by Bob Bakker.

Gorgosaurus ttbrafus was named by Lawrence Lambe of Canada in 1914. It might have been a large Albertosaurus.

Gorgosaurus sternbergmas named by American Museum paleontologists William Diller Matthew


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