 These vertebrae can be designated as belonging to the order Nectridea, a collection of long-tailed tetrapods (amphibians in the broad sense) also including the famous "boomerang-headed" "Diplocaulus".Like other nectrideans, "Arizonerpeton's" vertebrae had a single main body (a pleurocentrum) fused to a plate-like neural spine jutting out of the top.The flared rims of the front and rear surfaces of the pleurocentum possesses small structures which would have formed tongue-and-groove articulations with other vertebrae.