ZoomDinosaurs.com Dinosaur and Paleontology Dictionary

TYLOCEPHALE (pronounced TY-low-SEF-ah-lee) Tylocephale (meaning "swollen head") was a small, plant-eating dinosaur from the Late Cretaceous period, about 80 to 75 million years ago. It was a Pachycephalosaurid (and looked a lot like Pachycephalosaurus). It was about 7 feet (2.5 m) long and had a domed skull (like other Pachycephalosaurids) with bony knobs around it (almost like a crown). It had short arms, long legs, and a long, stiff tail. Only an incomplete skull was found (in Mongolia). It was named by paleontologists Maryanska and Osmólska in 1974.

TYLOSAURUS (pronounced TIE-low-SAWR-us) Tylosaurus (meaning "swollen lizard") was a mosasaur, a large, carnivorous marine reptile (but not a dinosaur) that lived during the late Cretaceous period. It was a powerful swimmer that had four paddle-like limbs on a long, streamlined body. The large head had large jaws with many teeth. It hunted fish, turtles, mollusks, and shellfish. It was about 33-40 feet (10-12.3 m) long and had long, sharp teeth. Fossils have been found in America (Kansas) and New Zealand. Tylosaurus dispar was one of the largest mosasaurs.

TYLOSTEUS Tylosteus is an old name for Pachycephalosaurus.

TYPE SPECIES A type species is the species of an organism from which a new genus is named. For example, Tyrannosaurus rex is the type species for the genus Tyrannosaurus.

TYPE SPECIMEN A type specimen is the set of fossil remains of an organism from which a new species is named.

TYRANNOSAURUS rex (pronounced tye-RAN-oh-SAWR-us recks) Tyrannosaurus rex (meaning "tyrant lizard king") was a huge, meat-eating theropod dinosaur from the late Cretaceous period.

TYRANNOSAURIDS (pronounced tye-RAN-oh-SAW-rids) The tyrannosaurids (meaning "tyrant lizards") were meat-eating dinosaurs (theropods) with two-fingered hands, small arms, a large head, sharp teeth, and lond, powerful hind legs. They lived during the late Cretaceous period. Other tyrannosaurids included Albertosaurus, Alectrosaurus, Alioramus, Chingkankousaurus, Daspletosaurus, Gorgosaurus, Nanotyrannus, Prodeinodon, Tarbosaurus, and T. rex.

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