Phylum Mollusca
Phylum Mollusca
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Examples of mollusks?
Clam, snail, squid, octopus.
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Examples of bivalves?
Clams, oysters, mussels.
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Two unique mollusk features?
Mantle and muscular foot.
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What is the umbo?
Oldest shell part (raised bump on a bivalve shell, usually near the hinge).
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What three body regions do they have?
Head, mantle, foot.
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What do growth rings show?
Age and growth pattern.
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Function of mantle?
Secretes shell.
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What closes clam shells?
Adductor muscles.
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Function of the foot?
Movement or burrowing.
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What opens clam shells?
The hinge ligament
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Mollusk symmetry?
Bilateral symmetry (identical mirror-image left and right halves).
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At rest, clam is open or closed?
Open.
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Bivalvia means what?
Two shells.
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Incurrent siphon function and what is it?
The incurrent siphon is a tube-like opening in a clam that takes water and food into the body.
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Excurrent siphon function and what is it?
A tube-like opening that sends water and waste out of the clam.
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What is a radula?
Rough, tongue-like scraping organ found in many mollusks.