Chapter 17

Question 1

List and describe the four major characteristics of the Chordata.

Answer 1

1) a single, hallow, dorsal nerve cord (spinal cord)
2) pharyngeal slits (gills on the pharynx) used for filler feeding or breathing
3)notochord (flexible skeleton rod)
4)post-anal tail (behind anus)

Question 2

What is the importance of the notochord?

Answer 2

*supports and stiffens the body
*provides a surface for muscle attachment
*body can bend without shortening

Question 3

What are the three major groups of chordates?

Answer 3

*Lancelets
*Tunicates
*Craniates