1. PHYLUM MOLLUSCA “The Mollusks”

2. Characteristics of the Phylum Mollusca 30,000+ extant mollusca = soft-bodied animals Characteristics of mollusks: 1. usually symmetrical, unsegmented, definite head/foot region 2. muscular foot (f) = locomotion 3. body wall is called a mantle 4. produces shell in some mollusks 5. surface of animal is ciliated & secretes mucous

3. Characteristics of the Phylum Mollusca continued… 6. radula = file-tongue 7. open-circulatory system w/3-chambered heart 8. gases exchange across the body's surface 9. 1 or 2 "kidney-like" structures called metanephridia 10. very developed nervous system

4. Classes of the Phylum Mollusca continued… Class Monoplacophora “mono” means one; “placo” means plate; “phora” means bearing -discovered in deep waters of the Pacific off of Mexico Class Polyplacophora “poly” means many; “placo” means plate; “phora” means bearing -examples: chitons Class Scaphopoda -tusk shells (a.k.a. tooth shells) Class Gastropoda…………..a.k.a. univalves - “gastro” means stomach; “poda” means foot - examples: conchs, whelks, cowries, augers, etc. Class Bivalvia………….a.k.a. bivalves -”bi” means two; “valve” refers to the shell -examples: clams, scallops, oysters Class Cephalopoda……………a.k.a. “valveless” -”cephalo” means head; “poda” means foot - examples: squid, octupus, cuttlefiesh, chambered nautilus

5. Mollusk Biodiversity

6. Phylum Mollusca, Class Polyplacophora Ventral View of Chiton, Katrina Dorsal View of Chiton, Katrina

7. Phylum Mollusca, Class Scaphopoda Tusk Shells , Dentalium

8. Class Gastropoda “Univlaves”

9. Phylum Mollusca, Class Gastropoda Univalves Top Shell Dove Shell Keyhole Limpet Shell Turrid Shell

10. Phylum Mollusca, Class Gastropoda Auger Shell Univalves Turitella Shell Turbin Shell Slipper Shell

11. Phylum Mollusca, Class Gastropoda Univalves Scotch Bonnet Shell Cowrie Shell Abalone Shell Olive Shell

12. Phylum Mollusca, Class Gastropoda Murex Shells Univalves

13. Phylum Mollusca, Class Gastropoda Cone Shell *This mollusk is very deadly. It is poisonous! Sundial Shell Univalves Moon Snail Shell

14. Univalves Limax, Pacific Slug *This is considered to be an univalve even though this particular species does NOT have a shell!

16. Univalves

17. Univalves

18. Univalves

19. Univalves

20. Univalves

21. Univalves