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ch 27 Mollusks
Able/Brown flashcards
11
Biology
9th Grade
03/21/2008

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Term
Phylum Molluska
Definition
Snails, slugs,clams, oysters. they have bilateral symmetry
Term
Gastropod
Definition
gastro=stomach, pod=foot Snails and slugs
Term
Bivalves
Definition
two shells-clams, scallops, oysters, mussels. They have a foot to use to bury themselves in sediment
Term
pearls
Definition
When a bivalve is irritated by a grain of sand and secretes a shell like material around it.
Term
Oysters
Definition
a bivalve that is a valuable food source that grows on each other to form trees. Apalachicola Bay is a major source which is fed by the Chattahoochee River
Term
Cephalopods
Definition
"head footed" Nautilus, squid, octopus. The foot in this group has evolved into tentacles with suckers
Term
Phylum Annelida
Definition
Segmented worms. Body plan is a tube within a tube with two openings.
Term
earthworms
Definition
Class Oligochaetes. swollow soil where it is groud by the gizzard into particles for digestion. when the worm passes the soil out of its body it releases nutrients back into the soil.
Term
Setae
Definition
hair like structures on the side of the earthworm that help anchor it in the soil
Term
Polychaetes
Definition
bristle worms- mostly found in marine environments. they are mostly predators with well developed sense organs and eyes. Some are filter feeders.
Term
Hirudinea
Definition
Leaches - parasites found mostly in fresh water that suck the blood of hosts. It has a chemical that keeps the blood of the host from clotting.
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