Xiongguanlong is a
genus of
tyrannosauroid dinosaur that lived in the
Early Cretaceous of what is now
China. The
type species is
X. baimoensis, described online in 2009 by a group of researchers from China and the United States, and formally published in January
2010. The genus name refers to the city of
Jiayuguan, a city in northwestern China. The
specific name is derived from
bai mo, "white ghost", after the "white ghost castle", a rock formation near the fossil site. The fossils include a
skull,
vertebrae, a right
ilium and the right
femur. The rocks it was found in are from the
Aptian to
Albian stages of the
Cretaceous, between 125 and 100 million years ago.