GENERAL CHARECTERSTICKS OF CEPHALOCHORDATA
Answers
Answer:Cephalochordata are small, segmented marine animals that possess elongated bodies with a notochord that extends the length of the body, extending from head to tail, persisting throughout the animal's life.
Explanation:
Answer:
General Characters:
1. Body is fish -like and is useful for burrowing and swimming.
2. It has a head.
3. It shows a tail.
4. Appendages are absent.
5. Dorsal, caudal and ventral fins are present.
6. Body- wall shows one- cell thick, non-ciliated epidermis, dermis, connective tissue, striated muscle and parietal peritoneum.
7. It has no exoskeleton.
8. Notochord extends from the anterior end to posterior end.
9. Enterocoelic coelom is present. However, reduced in the pharyngeal region by atrium.
10. Alimentary canal is long. It includes a large pharynx with many gill-slits ciliary mode of feeding is developed.
1 1. Gillss will perform respiration.
12. Circulatory system is closed.
13. Heart and respiratory pigments are absent.
14. Hepatic portal system is present.
15. Excretory system shows paired protonephridia with solenocytes.
16. Brain is not present
17. Two pairs of cerebral and several pairs of spinal nerves are present.
18. Sexes are separate. Gonads are metamerically arranged and with out gonoducts.
19. Asexual reproduction will not take place.
20. Fertilization is external.