 The osteoderms of other archosaurs are usually found in a paired row, and the symmetrical shape with two pointed spines (as well as furrows and notches on the midline of some) suggests they are actually fused pairs of osteoderms.The osteoderms also sport keels on their underside that lock neatly into the furrow in their vertebrae, which could suggest the osteoderms were restricted to the neck and front-most section of the back as the 'Y'-shaped spine tables are not found past the 4th dorsal vertebra.This would be unusual, but not completely unprecedented as some pseudosuchians (particularly ornithosuchids) are known to have only had osteoderms in front of the hips, although not to the extent in "Aenigmaspina".