Xiongguanlong is an extinct genus of tyrannosauroid theropod from the Early Cretaceous period of what is now China. The type and only species is X. baimoensis. The generic name comes from Jiayuguan City and the Mandarin word "long" which means dragon. The specific epithet, "baimoensis" is a latinization of the Mandarin word for "white ghost" in reference to one of the geological features of the type locality.
Xiongguanlong
Estimated size compared to a human
A size comparison of several small tyrannosauroids, Xiongguanlong is labeled (2)
The skulls of various tyrannosauroids with Xiongguanlong labeled (F)
Tyrannosauroidea is a superfamily 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. By the end of the Cretaceous Period, tyrannosauroids were the dominant large predators in the Northern Hemisphere, culminating in the gigantic Tyrannosaurus. Fossils of tyrannosauroids have been recovered on what are now the continents of North America, Europe and Asia, with fragmentary remains possibly attributable to tyrannosaurs also known from South America and Australia.
Tyrannosauroidea
Size of some small genera, compared to a human.
Skull and neck of Daspletosaurus, from the Field Museum of Natural History in Chicago.
Skull of Proceratosaurus, a proceratosaurid tyrannosauroid from the Middle Jurassic of England.