2. Notochord (present in some point of life cycle).

 

3. Single, dorsal, tubular nervechord; anterior end of cord usually enlarged to form a brain.

 

4. Pharyngeal pouches present at some stage in life cycle; in aquatic chordates these develop into pharyngeal slits.

 

5. Endostyle in floor of pharnx or a thyrod gland derived from the endostyle.

 

6. Postanal tail projecting beond to ans at some stage but may or may not persist.

 

7. Complete digestive system.

 

8. Segmentation if present, restricted to outer body wall, head, adn tail and not extending into coelom.