Mantle- thiCk layers of tissue that produces A shell Phylum - Mollusca Mantle- thiCk layers of tissue that produces A shell Bilateral symmetry Radula – ribbon of small teeth Gills for gas exchange

TYPES OF mollusks Gastropods Bivalves Cephalopods

Class - Cephalopoda

Cephalopods Good swimmers Reduced or absent shell Arms have suckers Large Eyes Thick Mantle Funnel- opening in mantle for water exchange (AKA SIPHON) Octopuses, Squid, and Cuttlefish

Can Secrete neurotoxin Ink sac for escape Octopus 8 Legs Lack shell Beak like jaw – radula Can Secrete neurotoxin Ink sac for escape

Octopus camoflauge

8 legs with suckers and 2 tentacles Have a shell/pen inside the mantle squid Body elongated 2 triangular fins 8 legs with suckers and 2 tentacles Have a shell/pen inside the mantle

Squid Sexual Selection

Squid- Class Cephalopoda

Cuttlefish Cuttlefish camoflauge http://www.youtube.com/watch?v=mWPbW893ik&feature=fvw Cuttlefish camoflauge

Have a unique internal shell, the cuttlebone (for buoyancy). Cuttlefish M Master’s of disguise NOT A FISH Have a unique internal shell, the cuttlebone (for buoyancy). Eight arms, and two tentacles with suckers

Cuttlebone

Cuttlefish Crab hunting

Chambered Nautilus

Chambered Nautilus Smooth coiled shell Has chambers that serve as a buoyancy organ No suckers