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9.3 Molluscs

QuestionAnswer
mantle The outer layer of tissue that secretes the shell of molluscs.
Chitin The main component of the exoskeleton of many animals
Shiphon 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 shells 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
spermatophore A packet of sperm in cephalopods
Created by: J13
 

 



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