2. Ancestral Protist segmentation true tissue radial symmetry bilateral symmetry Deuterostomes: eucoelom Protostome: schizocoelem pseudo coelom Porifera Cnideria Platyhelminthes Nematoda Mollusca Annelida Echinodermata Chordata Arthropoda no true tissues acoelom

3. Phylum Mollusca Class Polyplacophora Class Gastropoda Class Bivalvia Class Cephalopoda More than 500,000 known species chitonsSnails Sea slugs nudibranchs clams Squid Octopus Cuttlefish Nautilus Class Scaphopoda Tusk shells

5. Three main parts: Muscular foot- for movement Visceral mass- contains most of the internal organs Mantle cavity- houses gills

6. mantle foot visceral mass

7. Grazers (radula- scraping tongue) Filter feeding Egg eaters Active predation

8. Kingdom Animalia Phylum Mollusca

9. Class Polyplacophora chiton

10. Class Scaphopoda tusk shell

11. Spanish Dancer (nudibranch) & egg mass Class Gastropoda Subclass Opisthobranchia

12. nudibranchs Phistella Phylum Mollusca Class Gastropoda

13. nudibranchs Nembrotha kubaryana

14. Cuthona sp. Chromodoris annaeHalgerda batangas Chromodoris nudibranchs

15. Cowery Opihi periwinkle Class Gastropoda Cone snail

16. Epitomium

17. Triton’s trumpet

18. pterapods

19. Class Bivalvia

20. oyster

21. Class Cephalopoda Squid

22. Class Cephalopoda http://www.youtube.com/ watch?v=U2s3C0lkQE0 http://www.youtube.com/ watch?v=NR53smpV_xg

23. Class Cephalopoda Flamboyant cuttlefish

24. Class Cephalopoda nautilus

25. Class Cephalopoda octopus

26. Octopus Intelligence http://www.youtube.com/wa tch?v=GQwJXvlTWDw Start at 2 minutes

27. flatfish lionfish Sea snake Mimic octopus from Indonesia http://www.youtube.com/watch?v=H8oQBYw6xxc

28. Dumbo Vampire Coconut Amphioctopus marginatus

29. Blue-ringed octopus Highly venomous