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chapter 9.3
| Term | Definition |
|---|---|
| mantle | the outer layer of tissue that secretes the shell of molluscs |
| chitin | the main component of the exoskeletons of many animals |
| siphon | (funnel) The tube-like extension through which water flows in and out of the mantle cavity in bivalves and cephalopods, and in tunicates. |
| ink sac | A gland found in some cephalopods that secretes a dark fluid used to discourage predators. |
| open circulatory system | A system where the blood or circulatory fluid is not contained in vessels and can flow into the body cavity. |
| veliger | A planktonic larva in gastropods and bivalves. |
| foot | The muscular locomotory structure of molluscs. |
| valve | Any of the two shells of bivalves and lamp shells. |
| byssal thread | Strong fiber secreted by mussels for attachment. |
| pen | The reduced, thin shell of squids. |
| ganglion | (pl. ganglia) Clusters of nerve cells in gastropods and bivalves. |
| radula | The ribbon-like band of teeth of molluscs. |
| umbo | The region around the hinge of a bivalve’s shell. |
| biofouling | Unwanted settlement of organisms on submerged surfaces of boats, pilings, and other structures. |
| crystalline style | An enzyme-releasing rod in the stomach of bivalves. |
| spermatophore | A packet of sperm in cephalopods. |
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