`Name_________________________________________________
Unit 6: Phylum Mollusca Review
1. Circle the group that represents mollusks. Then list all of the characteristics that mollusks have
according to the cladogram above.
Multicellularity, Tissues, Organs, 3 Germ Layers, Bilateral Symmetry, Cephalization, Protostome
Development
I. General Characteristics
2. Using your notes, fill in the chart about mollusks.
Levels of Organization
Specialized cells, tissues, and organs
Body Symmetry
Bilateral symmetry
Germ Layers
Three (Ectoderm, Mesoderm, Endoderm)
Body Cavity
True coelom
Embryological Development
Protostome
Segmentation
Absent
Cephalization
Present
II. Mollusk Body Plan
3. Mollusks were the first major group of animals that evolved a coelom. According to your notes, what
were the 3 advances that came as a result of the evolution of a coelom.
Allowed for the development of complex tissues and organs
Allowed for the different body plans and architecture
Allowed for animals to grow larger than the simpler animals
4. List the three major areas of the mollusk body. Describe each area.
Mantle- outer covering
Visceral Mass- middle of body where most organs are
Muscular foot
5. Label the following diagrams:
You are only responsible for knowing the structures that you had to label and that we covered in class.
6. What is the function of the radula?
Used for feeding; tongue like structure with tiny teeth used to scrape
7. Fill in the chart below by listing the unique characteristics for each of the 3 major classes of mollusks.
Then provide two examples of mollusks from each class in the bottom row.