To which specific family within Tyrannosauroidea is Xiongguanlong classified?
Answer
Proceratosauridae
*Xiongguanlong* is formally situated within the superfamily Tyrannosauroidea, but more specifically, its classification places it within the family Proceratosauridae. This places it alongside other early, often crested, tyrannosauroids such as *Guanlong* and *Proceratosaurus*. Being a member of this basal group is significant because it demonstrates that the early dispersal and diversification of the lineage were well established before the appearance of the gigantic apex predators of the Cretaceous period. The characteristics shared within Proceratosauridae, such as elongated facial structures in some members, offer vital data points for mapping the initial evolutionary trajectory of this important dinosaur group.

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