1. Phylum Mollusca Examples: Snails, slugs, squid, clams, octopus, and scallops

2. Characteristics Term means “soft” Live in oceans, freshwater and terrestrial Two body openings Muscular foot for movement

3. More Characteristics Well developed head w/mouth Nervous system w/ brain Open or closed circulatory systems Gills for gas exchange - oxygen Bilateral symmetry Coelomates Mantle - thin membrane around internal organs - secretes shell if animal has one!

4. Class Cephalopoda Octopus, squid, cuttlefish and nautilus

5. Characteristics Name means “head foot” (the foot is the tentacles by which they capture prey) Siphons to expel water gathered in mantle Move by jet propulsion (squid 20m/s) Release ink to confuse predator External (nautilus), internal (squid) or no shell (octopus) * Closed circulatory system

6. Squid Facts Internal pen used as body support Strong beak to tear food 2 tentacle with suction cups and ring of teeth to capture prey Have chromatophores- pigment cells to help body change color Large eyes