1. Photo credit: MSC

2. A Classroom Lesson from the Mathematics & Science Center Mathematics & Science Center Photo credit: NOAA

3. What is a Mollusk? Photo credit: NOAA

4. Mollusks are Animals… From the Latin: “Mollusca” From the Latin: “Mollusca” Soft-bodied Soft-bodied Invertebrate Invertebrate 3 body parts: Head, foot, mantle cavity 3 body parts: Head, foot, mantle cavity Photo credit: USGS

5. Sometimes with Shells Photo credit: USGS

6. The Mantle Mantle secretes the shell and pearly lining Mantle secretes the shell and pearly lining Univalve: 1 shell Univalve: 1 shell Bivalve: 2 shells Bivalve: 2 shells Photo credits: MSC

7. Mollusks & Movement Foot Foot Muscular organ to move, dig, slide… Muscular organ to move, dig, slide… Radula Radula Rasping tongue to obtain food or drill holes in other shells Rasping tongue to obtain food or drill holes in other shells Photo credit: USGS

8. More Mollusk Info. 2 nd largest group of animals 2 nd largest group of animals 100,000 known species Most are Marine, but can live in fresh water and on land Most are Marine, but can live in fresh water and on land Importance to man? Importance to man?

9. Classification 7 Classes of Mollusks 7 Classes of Mollusks 3 Major Classes 3 Major Classes Gastropoda Gastropoda Snails, slugs, limpets Snails, slugs, limpets Bivalvia Bivalvia Clams, oysters, scallops, mussles Clams, oysters, scallops, mussles Cephalopoda Cephalopoda Octopus, squid, nautilus Octopus, squid, nautilus Photo credit: NOAA

10. Land Snail Photo credit: NOAA

11. Aquatic Snails Photo credits: MSC

12. Slug Photo credit: NOAA

13. Banana Slug Photo credit: MSC

14. Nudibranch

15. More Nudibranchs Photo credits: MSC

16. Bivalves Photo credit: NOAA Photo credit: MSC

17. Cephalopods

18. More Octopi Photo credit: MSC

19. Squids

20. The Chambered Nautilus Photo credits: MSC

21. Mud Snails Observe the mud snail specimens Observe the mud snail specimens Identify the following structures: Identify the following structures: Foot Foot Siphon tube Siphon tube Tentacles Tentacles Eyes Eyes Operculum Operculum Radula Radula Illustration credit: MSC

22. References MSC (Mathematics & Science Center Slide Collection) MSC (Mathematics & Science Center Slide Collection) NOAA (National Oceanic and Atmospheric Administration) Photo Library NOAA (National Oceanic and Atmospheric Administration) Photo Library USGS (U.S. Geological Survey) USGS (U.S. Geological Survey) Golden Guide Seashells of the World Golden Guide Seashells of the World Photo credit: USGS