Tyrannosaurus (/ tɪˌrænəˈsɔːrəs, taɪ -/) [a] is a genus of large theropod dinosaur. The type species Tyrannosaurus rex (rex meaning 'king' in Latin), often shortened to T. rex or colloquially T-Rex, is one of the best represented theropods.

Tyrannosauroidea (meaning 'tyrant lizard forms') is a superfamily (or clade) of coelurosaurian theropod dinosaurs that includes the family Tyrannosauridae as well as more basal relatives. Tyrannosauroids lived on the Laurasian supercontinent beginning in the Jurassic Period.

Tyrannosauridae (or tyrannosaurids, meaning " tyrant lizards") is a family of coelurosaurian theropod dinosaurs that comprises two subfamilies containing up to fifteen genera, including the eponymous Tyrannosaurus. The exact number of genera is controversial, with some experts recognizing as few as three.

2025年2月3日 · tyrannosaur, any of a group of predatory dinosaurs that lived from the late Jurassic Period (about 150 million years ago) to the end of the Cretaceous Period (about 65 million years ago), at which time they reached their greatest dominance.

There were over 9 different Tyrannosaurs, each specialized for a specific time period and environment. These dinosaurs were continusouly evolving and becoming more specialized. Some grew in size, while others shrunk in size. Some were adapted to the polar regions, while others were adapted to a more tropical climate near the equator.

Tyrannosaurus rex is the best-known and largest member of a group of theropod dinosaurs called tyrannosaurs; its scientific name is Latin for “king of the tyrant lizards.” Since 1902 paleontologists have recognized the T. rex as the only formal member of the genus Tyrannosaurus.

Tyrannosaurs belong to the Saurischia, or "reptile-hipped" dinosaurs. Within the Saurischia, tyrannosaurids belong to the group of carnivorous dinosaurs known as theropods. Traditionally, the tyrannosaurs have been included within the Carnosauria.

Based on fossilized specimens, the scientists estimate that T-rex stood approximately 12 ft. tall at the hip, and grew about 40 ft. long. These massive creatures were some of the largest land carnivores to roam this earth. The Tyrannosaurus had a large head, very small front legs, and muscular rear legs.

2019年7月3日 · Tyrannosaurs were the killing machines of the Cretaceous period. Here's a look at how paleontologists classify these dinosaurs.

2024年4月1日 · Ever since the discovery of its fossils more than a century ago, T. rex has fascinated people of all ages and walks of life, and today it plays a starring role in studies, museums and popular...