 A relationship amongst proterochampsians is unlikely, as the only similarity they share is a rough skull roof, and proterochampsians lack the characteristic spine tables and often have much thicker, sculpted osteoderms.The relationship to ornithosuchids is more plausible, as they share some characteristic features, but not all.However, it is also equally plausible that "Aenigmaspina" is related erpetosuchids, a group of small pseudosuchians with similarly enigmatic and variable affinities, as they both share broad spine tables, although none are as prominently 'Y'-shaped like in "Aenigmaspina".