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Unformatted text preview: April 28, 2008 Phylum Mollusca class Gastropoda - abolone Class bivalvia clams,osters, scallop Class cephalopoda suiq, octipi Class poluplacophora Distinguishing Characteristics- soft body- head = eyes, tentacles- body covered by mantle- Unsegmented body- foot- Radula used to scrape algae, basically a tooth - Trochophore larval stage the shape that they take- gas exchange paired gills Digestion- separate mouth and anus- Salivary and digestive glands- Many types depending on group Circulatory System- heart = pumps the blood to tissues- most have open circulatory system blood pumped into the body cavity- Cephalopods Closed circulatory systems Nervous system - very diverse- complex in cephalopods- simple in snails, bivalves, and chitons set of local brains ganglia (clusters of nerve cells) Class Gastropoda marine snails- larges group- soft body dorsal shell- creeping foot image: moon snail, cone snail, snail anatomy, periwinkle snail, wavy whelk, Spanish...
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- Spring '08