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Molluscs

chapter 9 lesson 3

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 A highly resistant carbohydrate also found in other invertebrates.
valves two shells of bivalves and lamp shells.
umbo the upper hump near the hinge of each shell
siphons tube-like extension that flows in and out of the mantle cavity in bivalves and cephalopods.
Byssal threads Strong fiber secreted by mussels for attachment.
biofouling organisms that settle on the bottoms of boats, piling, and other submerged structures.
ink sac dark fluid used to discourage predators.
pen reduced thin shells of squids
crystalline style an enzyme-secreting rod in the stomach.
open circulatory system blood flows out of vessels into open blood spaces.
ganglia clusters of nerve cells located in different parts of the body.
spermatophores elongated packets of sperm.
veliger a planktonic larva that has a tiny shell.
Created by: user-2012573
 

 



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