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9.3 Molluscs
| Term | Definition |
|---|---|
| mantle | 1. the semiliquid region between the crust and the core of earth 2.the outer layer of tissue that secretes the shell of molluscs |
| foot | the muscular locomotory structure of molluscs. |
| radula | the ribbon like band of teeth of molluscs |
| chitin | the main component of the exoskeleton of many animals |
| valves | any of the two shells of bivalves and lamp shells |
| umbo | the region around the hinge of a bivalves shell |
| siphons | the tube like extension through which water flows in and out of the mantle cavity in bivalves and cephalopods and in tunicates |
| byssal threads | strong fiber secreted by mussels for attachment |
| biofouling | unwanted settlement of organisms on submerged surfaces of boata, pilings, and other structures |
| ink sac | a gland found in some cephalopods that secretes a dark fluid used to discourage predators |
| pen | the reduced, thin shell of squids |
| crystalline style | an enzyme releasing rod in the stomach of bivalves |
| open circulatory system | a system where the blood or circulatory fluid is not contained in vessels and can flow into the body cavity |
| ganglia | clusters of nerve cells in gastropods and bivalves |
| spermatophores | a packet of sperm in cephalopods |
| veliger | a planktonic larva in gastropods and bivalves |
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