1. Phylum Mollusca

2. Bi-lateral Bi-lateral 3 body parts 3 body parts Eucoelomates (coelomates) Eucoelomates (coelomates) Tridacna squamosa Tridacna gigas

3. Phylum Mollusca Soft Bodied Soft Bodied Shelled Shelled Some without Some without Cephalization Cephalization Sensory organs Sensory organs Mouths Mouths Body Divisions Body Divisions Visceral Mass Visceral Mass Head-Foot Head-Foot Mantle Mantle Tonicella lineata

4. Phylum Mollusca Complete digestive tract Complete digestive tract Digestive glands Digestive glands Specialized feeding structures (radula) Specialized feeding structures (radula) Circulatory system Circulatory system Heart (3 chambers) Heart (3 chambers) Open system in most groups Open system in most groups Closed in cephalopods Closed in cephalopods Octopus briareus

5. Phylum Mollusca Advanced nervous system Advanced nervous system Brain Brain Sensory organs Sensory organs Eyes (simple and camera) Eyes (simple and camera) Sensory papillae Sensory papillae Excretory system Excretory system Kidney-like nephridia Kidney-like nephridia Anus Anus Reproduction Reproduction Most are separate sexes (snails are hermaphrodites Most are separate sexes (snails are hermaphrodites External (aquatic)& internal (land)fertilization External (aquatic)& internal (land)fertilization

6. Mollusc Taxonomy Major classes Major classes Polyplacophora Polyplacophora Chitons Chitons Chiton tuberculatus lives in the rocky intertidal zones eat algae with its radula 8 shell plates

7. Mollusc Taxonomy Major classes Major classes Gastropoda Gastropoda (stomach/foot) (stomach/foot) Snails, slugs Snails, slugs Atlantic triton’s trumpet (Charonia variegata) Tiger cowrie (Cypraea tigris)

8. Mollusc Taxonomy Major classes Major classes Bivalve Bivalve Clams, oysters, mussels, scallops Clams, oysters, mussels, scallops Bay scallop (Aequipecten irradians) Edible mussels (Mytilus edulis)

9. Mollusc Taxonomy Major classes Major classes Polyplacophora Polyplacophora Gastropoda Gastropoda Bivalvia Bivalvia Cephalopoda Cephalopoda Octopus, squid, nautilus Octopus, squid, nautilus Giant cuttlefish (Sepia latimanus) Nautilus sp Octopus sp

10. Generalized Mollusc Anatomy

11. A Pearl Among the Swine

12. Trochophore Larva

13. Adult Abalone

14. Class Polyplacophora - chitons

15. Class Gastropoda The Shell Game

16. Gastropod Shell Coiling

17. Marine Gastropods Cowries

18. Marine Gastropods Sea Hare – Aplysia sp

19. Marine Gastropods - Nudibranch

20. Terrestrial Gastropods - Pulmonata The mantle cavity serves as a “lung” The mantle cavity serves as a “lung” Glandular epidermis Glandular epidermis Secrete mucus (slime) upon which gastropod glides Secrete mucus (slime) upon which gastropod glides

21. Phylum Mollusca, Class Bilvalia Two shells Two shells Incurrent & excurrent siphons Incurrent & excurrent siphons No cephalization No cephalization

22. Generalized Bivalve Anatomy

23. Bivalve Anatomy (Sagittal)

24. Bivalves are Typically Filter Feeders

25. Phylum Mollusca, Class Cephalopoda Closed circulatory system Closed circulatory system Shell: lost in Octopus, extremely reduced and enclosed in mantle in squid, planar spiral in Nautilus Shell: lost in Octopus, extremely reduced and enclosed in mantle in squid, planar spiral in Nautilus Cephalization Cephalization eye eye Beak around mouth Beak around mouth Tentacles/arms Tentacles/arms

26. Cephalopod Anatomy

27. Squid are the largest Cephalopods

28. Nautilus Anatomy

29. Cephalopod Eye

30. Direct Development in Cephalopods

31. Color & Morphology Changes for Camouflage