Which family groups *Xiongguanlong* with *Guanlong* and *Proceratosaurus*?
Answer
Proceratosauridae
The phylogenetic placement of *Xiongguanlong* involves grouping it with other basal forms that share specific skeletal traits. Many paleontologists utilize classifications that place *Xiongguanlong* within the family Proceratosauridae. This grouping is notable because it unites *Xiongguanlong* with other early, lightly built tyrannosauroids such as *Guanlong* and *Proceratosaurus*. While it is firmly situated within the broader Tyrannosauroidea superfamily, the designation of Proceratosauridae helps delineate this earlier, less robust branch of the tyrannosauroid evolutionary tree before the massive size and robust features became dominant characteristics.

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