Dong Zhiming
Simmons assigned "Tatisaurus" to the Hypsilophodontidae, though this group was seen by him as an evolutionary grade of "primitive" Ornithopoda, ancestral to several ornithischian groups. He felt that "Tatisaurus"' affinities were with "Scelidosaurus" or the Ankylosauria. Later, in 1990, the specimen was reviewed by Dong Zhiming, who noted it had similarities with "Huayangosaurus". He placed the two genera in the same subfamily, the Huayangosaurinae, within the Stegosauria.