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Mollusk

9.3

TermDefinition
Mantle The outer layer of tissue that secretes the shell of molluscs.
Chitin The main component of the exoskeleton of many animals.
Siphon 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.
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.
Spermatophores A packet of sperm in cephalopods.
Created by: pooleeli
 

 



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