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Chapter 9 Lesson 3

Vocabulary

TermDefinition
Mantle A thin layer of tissue that secretes the shell
Foot The muscular locomotory structure of molluscs
Radula A ribbon of small teeth that is used to feed
Chitin The main component of the exoskeleton of many animals
Valve Any of the two shells of bivalves and lamp shells
Umbo The region around the hinge of a bivalve’s shell
Siphons (funnel) 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 boats, 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
Spermathophores A packet of sperm in cephalopods
Veliger A planktonic larva in gastropods and bivalves
Created by: user-1863631
 

 



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