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Nanotyrannus lancensis (3) - tooth (Saurischia, Theropoda, Carnosauria, Tyrannosauridae)

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Description

real fossil tooth of carnivorous biped dinosaur, mm 18 x 7.

The Nanotyrannus ("little tyrant") is a genus of family Tyrannosauridae, some considered a juvenile specimen of Tyrannosaurus. E' known only by a small skull discovered by Charles W. Gilmore in 1942 and described in 1946 as a model of Gorgosaurus lancensis (now known as Albertosaurus). In 1988, the sample was once described by Robert T. Bakker and colleagues, based on the bones of the skull that they fuse, therefore, belonged to an adult. In this light, the skull assigned to a new genus called Nanotyrannus for its apparent small size. But new doubts arose about it, and some paleontologists do not consider most valuable kind since the animal was a contemporary of Tyrannosaurus rex, and therefore it is regarded as a juvenile T.rex, especially after the discovery in 2001 of a new sample of Nanotyrannus, nicknamed "Jane", which was estimated to be approximately 5.2 meters long (17 feet).
In 2005, a conference on Tyrannosaur and Nanotyrannus interpreted the discovery of Jane as a confirmation that Nanotyrannus was a  juvenile T. Rex or a closely related species, while paleontologists and others support the hypothesis that the Nanotyrannus is a distinct genus.
Bakker said he considers that Nanotyrannus hunt in packs: multiple teeth of nanotyrannus were found in the bones of herbivorous dinosaurs.

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