Snail, oyster, squid, octopus, slug, chiton Page 530 Phylum: Mollusca Snail, oyster, squid, octopus, slug, chiton

Characteristics Soft body (yummy part!) Muscular system: Muscular foot (movement) Visceral mass (contains organs) Most have a shell Produced by the mantle

Have a true body cavity (coelom) Reproductive System: Most reproduce sexually Most have an open circulatory system Not all blood moves in vessels Excretory System: Nephridia

Three Main Classes Gastropoda --”stomach foot” --snails, slugs, conchs --Respiratory system: gills --have a tongue with teeth..radula --Herbivore—eats plants

2. Bivalvia “two shells” Clams, oysters, scallops, mussels Filter feeders Found in fresh and salt water Page 533 Eyespots

3. Cephlapoda “head foot” Octopus, squid, nautilus, cuttlefish Highly developed nervous system CLOSED circulatory system

Predators Can change color Squirt ink for protection Have eyes like us Tentacles with suction cups Squid = 10 Octopus = 8

The Chambered Nautilus Chambered shell Animal lives in outer chamber Other chambers are filled with gas to control animal’s depth