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WARM UP 1. List seven characteristics of roundworms. Mollusks Notes Phylum Mollusca General Characteristics • Live in a variety of habitats • Extreme diversity – About 100,000 species – Six classes Structure • Mantle protects the soft body and secretes the shell • Gills for gas exchange • Visceral mass contains the organs • Muscular foot used for movement • Open circulatory system – Structures are bathed in blood Class Gastropoda • “Belly foot” • The largest class of mollusks – Snails, slugs, etc. • Use a tongue-like radula to scrape and tear food Class Bivalvia • Pelecypoda = “hatchet foot” – Use foot for burrowing • Clams, oysters , scallops • Two part hinged shell – Muscle to open and close • Filter feeders – Use gills – No distinct head or radula Class Cephalopoda – “Head foot” – Squid , octopus, nautilus, cuttlefish – Adapted for active predation • Well-developed head, eyes, and nervous system • Foot is modified into tentacles • Can move quickly by jet propulsion – High oxygen demand – Closed circulatory system • Radula and jaws WRAP UP • Place each of the pictures into the correct Class of Phylum Mollusca. Choices are Bivalvia, Scaphopoda, Polyplacophora, Monoplacophora, Gastropoda, Cephalopoda