2. 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

3. TYPES OF mollusks
Gastropods
Bivalves
Cephalopods

4. Class - Cephalopoda

5. 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

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

8. Octopus camoflauge

10. 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

11. Squid Sexual Selection

14. Squid- Class Cephalopoda

15. Cuttlefish Cuttlefish camoflauge
Cuttlefish camoflauge

17. 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

18. Cuttlebone

19. Cuttlefish Crab hunting

20. Chambered Nautilus

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