Protochordates are not vertebrates as_____.

An unofficial group of creatures is known as protochordates. Another name for protochordates is Acrania. They are distinguished by lacking a vertebral column. The skull and cranium are absent from them. They don't have jaws, either. Hemichordate, Urochordate, and Cephalochordates are the subphyla and phylum that make up this group.