Y8420 - T-Rex. Tyrannosaurus is a genus of coelurosaurian theropod dinosaur. The species Tyrannosaurus Rex, commonly abbreviated to T. Rex, is one of the most well-represented of the large theropods. Scientific name: Tyrannosaurus. Extinction status: Extinct. Higher Classification: Tyrannosaurini. Makes a Great Gift! Made of cold cast resin. Hand painted. Case of 48. Dimensions: Length: 2.25" by Width: 1.25" by Height: 3.75"; Weight: 0.35 pounds