Study Guide—Phylum Annelida
Test Date _________________________
1. Know all vocabulary terms!
2. Annelids are ____________________________________ which means they have three cell layers.
These layers are:
3. Type of symmetry annelids have: ____________________________________________
4. Type of coelom (body cavity) annelids have: ___________________________________
Draw that type of coelom:
5. Do annelids have a closed or open circulatory system? _____________________________
6. ________________________________________: tissue membranes that suspend organs in place
7. ________________________________________ is another word for segment.
8. _______________________________ are little walls that separate each metamere.
9. ________________________________________: fleshy lobe that overhangs the mouth
10. ________________________________________: first body segment
11. ________________________________________: reproductive structure in earthworms
12. _______________________________: chitonous bristles secreted by the epidermis
13. Many worms breathe by diffusion through their __________________ while others use
parapodia or gills to breathe.
14. Annelids digestive system is unidirectional or bidirectional? _______________________________
15. What are the “hearts” of an earthworm called? _______________________________________________
16. These organs are part of the excretory system in annelids: _________________________________
17. Is reproduction of most annelids sexual or asexual? _________________________________________
Class Polychaeta
Class Oligochaeta
Class Hirudinea
Habitat(s)
Common Organisms
Setae—Many, few, or
none?
Parapodia—yes or
no?
18. What are hermaphrodites? _____________________________________________________________________
Another name for hermaphrodite is __________________________________________.
19. What is the largest class in Phylum Annelida? _____________________________________________
20. What does the name “Polychaeta” mean? _____________________________________________________
21. Paddle-like appendages that aid in movement and have bundles of setae on them are
called _______________________________________________.
22. The fusion and specialization of many segments into one is called
_____________________________________.
23. Which worm in Class Polychaeta is a filter feeder? ______________________________________
24. Which worm in Class Polychaeta lives in a mutualistic relationship with starfish?
_________________________________ What does it do for the starfish? What does the starfish do
for it?
25. Class Polychaeta is _______________________________ meaning there is a separate male and
separate female.
26. What is the larva of Class Polychaeta called? ______________________________________
27. What does the name “Oligochaeta” mean? ____________________________________________________
28. Are earthworms hermaphrodites? _____________ Do they fertilize their own eggs? __________
29. Describe the reproductive process of earthworms?
30. You will write a short paragraph on what worms feed on and how they are good for the
environment. Do they eat dirt? Where do their nutrients come from? Write some key
points for your paragraph below:
31. What organisms are in Class Hirudinea? __________________________________________
32. Do you feel a leech when it attaches to you? Why or why not?
33. Are leeches hermaphrodites? ______________ Do they fertilize their own eggs? _____________
34. What are leeches used for in the medical field?
35. Label.