Huayangosaurinae was originally differentiated by the remaining taxa within Stegosauridae by the presence of teeth in the , an , and a . Huayangosaurinae, known from the Middle Jurassic of the Shaximiao Formation, was proposed to be intermediate between Scelidosaurinae and Stegosaurinae, suggesting that the origins of stegosaurs lay in Asia.
Huayangosaurinae was initially distinguished by the presence of teeth in the , an , and a . Huayangosaurinae, found from the Middle Jurassic Shaximiao Formation, is thought to be a transitional form between Scelidosaurinae and Stegosaurinae, suggesting that stegosaurs may have originated on the Asian continent.