 "Aenigmaspina" is characterised by the unusual spines on its vertebrae, which are broad and flat on top with a unique 'Y' shape.Although parts of its skeleton is relatively well known, the affinities of "Aenigmaspina" to other pseudosuchians are unclear, although it is possibly related to families Ornithosuchidae, Erpetosuchidae or Gracilisuchidae.