Xiongguanlong baimoensis (Li et al. 2010; Early Cretaceous; skull length 55cm, scale bar 3cm) was originally considered a long-snouted tyrannosaur, but here nests in the long-snouted Guanlong + giant Spinosaurus clade.

Guanlong wucaii (Xu et al. 2006, IVPP V 14531) Early Cretaceous ~125 mya, was originally considered a basal tyrannosauroid, but here nests as a basal megaraptor derived from a sister to Proceratosaurus, which it greatly resembles. Two specimens are known. One is much smaller.

Notable traits include the tiny head with medial crest and the very large feet. The juvenile had a smaller crest restricted to the anterior.

Li D, Norell MA, Gao K-Q, Smith ND and Makovicky PJ 2010. A longirostrine tyrannosauroid from the Early Cretaceous of China. Proceedings of the Royal Society B 277:183-190.

Xu X, Clark JM, Forster CA, Norell MA, Erickson GM, Eberth DA, Jia C and Zhao Q 2006. A basal tyrannosauroid dinosaur from the Late Jurassic of China (PDF). Nature 439 (7077): 715–718.

wiki/Guanlong
wiki/Xiongguanlong