Write three salient features of Cephalochordates.

Explanation

1.They are marine found in shallow waters.
2. They lead a burrowing mode of lifc.
3. They are fish like with notochord, nerve cord and pharyngeal gill slits throughout their life.
4. Closed type of circulatory system is seen without heart.
5. Excretion is by protonephridia.
6. Sexes are separate.
7. Fertilization is external.
8. Development is indirect with a larva e.g. Amplhioxus.