Phylum Mollusca

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Phylum Mollusca by Mind Map: Phylum Mollusca

1. Cephalopoda

1.1. Body: Head is surrounded by a foot divided into tentacles. Can either have a shell or no shell. Color may change.

1.2. How/What it Eats: Most have beaks with which to tear or bite with.

1.3. Movement: Creeping, swimming with specialized fins and by squirting jets of water from an interior cavity.

1.4. Picture:

2. Bivalvia

2.1. Body: Two halves to the shell.

2.2. How/What it Eats: Suspension feeders

2.3. Movement: Most burrow into the sand

2.4. Picture:

3. Gastropoda

3.1. Body: Largest of the classes. Shell has 3 layers. Outer-fibrous to distribute shock. Middle-strong crystalline calcium carbonate for strength. Inner-smooth calcium carbonate to provide a nonabrasive surface.

3.2. How/What it Eats: Grazers and suspension feeders

3.3. Movement: Gastropod (gaster = stomach; pod = foot). Like a snail.

3.4. Picture:

4. Polyplacophora

4.1. Body: Oval shaped. 2-8 cm long.

4.2. How/What it Eats: Rasp-like mouth parts to remove algae from rocks.

4.3. Movement: Shell consists of 8 articulating plates

4.4. Picture: