Xilousuchus is an extinct genus of poposauroid from lower Triassic (Olenekian stage) deposits of Fugu County of northeastern Shanxi Province, China.

[3] In his massive revision of archosaurs which included a large cladistic analysis, Sterling J. Nesbitt (2011) found Xilousuchus to be a poposauroid which is most closely related to Arizonasaurus.

The tooth has small serrations, is curved backwards, and is laterally compressed, indicating that it could have punctured flesh or possibly sliced off chunks.

The skull has a reasonably well-preserved braincase with thick walls and a small volume, and this shows that the brain was not large.

The dentary bone is partially preserved for both left and right, and would have held thirteen teeth on each side, although only the nutrient foramina remain.

[3] The cervical vertebrae have large, flattened neural spines which make up most of their height and would have formed a sail-like structure in life, similar to other ctenosauriscids.

Two caudal vertebrae are present as well, and these are poorly preserved with missing neural spines, but show facets where chevrons would have been attached.