1. All the vertebrates or Craniates are placed under the Subphylum Vertebrata or Craniata

2. Agnatha - superclass of eel-shaped chordates lacking jaws and pelvic fins: lampreys; hagfishes; some extinct forms superclass Agnatha Craniata,

3. Craniates (Craniata) are a group of chordates that includes hagfish, lampreys, and jawed vertebrates such as amphibians, birds, reptiles, mammals, and fishes

4. The Craniata, or Craniates, include all animals having a skull (or cranium, hence their name), be it cartilaginous or bony. A skull is a box of hard tissues which …