Question

Phylum Mollusca

1. Observe the dissected clam.

1. What are the three basic parts of a clam body?          ______________________

                                                                               ______________________

                                                                               ______________________

2. Which class includes the clams?                                ______________________

3. What are the other examples of bivalves displayed on the counter?

          ________________________________________________________________

2. How do you recognize chitons from external examination? __________________

3. a. Which class includes the land snails?                                ___________________

b. What are the other examples of this class?

__________________________________________________________________

4. a. Where is the “shell” of a squid?                                ______________________

b. Which class includes the squids?                              ______________________

1. What are the other examples of this class?

_________________________________________________________________

5. What is the example of class Scaphopoda?                  _______________________

Answer 1

A. a visceral mass, mantle, which wraps around the visceral mass and produces the shell if there is one; and the foot.

b. Class Pelecypoda

c. The best-known examples of bivalves are clams, mussels, scallops and oysters.

d. The chitons have a dorsal shell consisting of eight plates (valves). The plates provide flexibility to move across uneven surfaces, as well as robust protection. Chitons display a powerful adhesion to the surface and are not easily removed by potential predators.

a. Class Gastropoda includes snails.

b. The class Gastropoda includes snails, slugs, limpets, and sea hares.

a. Squid are molluscs like clams and oysters but they have no shells on the outside of their bodies! They have a shell inside their bodies called a pen.

d. Siphonodentalium, Pulsellum are examples of Scaphopoda.