1. Echinoderms are _________________.

     Invertebrate protostomes               
       Invertebrate deuterostomes        
     Vertebrate deuterostomes

2. This winged echinoderm larva is called a _____________________.

3. Name 3 characteristics found in ALL echinoderms.

4. Type of symmetry in an adult seastar.
              asymmetry         radial symmetry     bilateral symmetry

5.The ability seen in starfish to "self amputate" or drop body parts on purpose is called _______________.

6. The ring canal, stone canal, radial canals, and madreporite are all parts of the _________________ system.

Image by Riedell

7. Name the pincherlike structures 
(shown green in diagram at the left) 
on the surface of seastars.

8. Give a function for these.

9. All echinoderms are MARINE. Tell what that means.

10. Echinoderms remove their nitrogen waste through the ___________________.

        anus     skin gills     surface of tube feet      madreporite

11. Which part of a starfish's stomach is extruded out through its mouth to eat?

12. Give a function of the digestive gland in a starfish.

13. Name an organ seen in worms and clams that is missing in starfish.

14. Echinoderms are the only invertebrates whose blastopore becomes its _________. 
                       mouth   anus  

 15. Name one of the structures found inside the ambulacral ridge.  

16. Name these calcium carbonate plates used to form the endoskeleton in a starfish.

Image from:

17. The Latin meaning of the term ECHINODERM is _____________________.

18. Starfish have ______________ fertilization and ___________ development. 

                         external/internal                            direct/indirect


19. The madreporite and anus are located on a starfish's _________ surface.

      Starfish have cephalization.

21. Give Kingdom, Phylum, and Class for seastars.

22. What do the typhlosole in earthworms, gill ridges in clams, and skin gills in starfish ALL have in common?

23. The general word that refers to reproductive organs is __________________.


Image modified from BIODIDAC

24. Name B

25. Name E



26. Name the groove on the oral surface that holds the tube feet.

27. Name the special type of radial symmetry seen in 5 armed starfish.

28. Starfish have _____________ circulation.
                           OPEN   CLOSED

29. Starfish use _________________ reproduction
                        ASEXUAL    SEXUAL

30. Part of a starfish's stomach that connect to the digestive glands and anus.



1. Invertebrate deuterostomes
2. bipinnaria
3. ONLY invertebrate deuterostomes
   spiny skin
   bipinnaria larva
   endoskeleton of ossicles
   Water vascular system with tube feet
   Radial symmetry as adults
4. radial symmetry
5. autotomy
6, water vascular system
7. pedicellariae
8. keep surface clear
9. live in salt water (oceans)
10. skin gills and surface of tube feet
11. cardiac
12. make bile, finish digestion, absorb nutrients
heart or intestine
14. anus
15. radial nerve OR radial canal
16. ossicles
17. spiny skin
18. external fertilization & indirect development
19. aboral
20. FALSE; NO Cephalization
21. Kingdom: Animalia   Phylum:Echinodermata   Class: Asteroidea
22. ALL increase surface area
23. gonads
24. stone canal
25. ampullae
26. ambulacral
27. pentaradial
28. open
29. BOTH asexual and sexual
30. pyloric