1. Photo credit: MSC

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

3. What is a Mollusk?
Photo credit: NOAA

4. Mollusks are Animals… From the Latin: “Mollusca” Soft-bodied
Invertebrate
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
Univalve: 1 shell
Bivalve: 2 shells
Photo credits: MSC

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

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

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

15. More Nudibranchs
Photo credits: MSC

16. Bivalves
Photo credit: MSC
Photo credit: NOAA

17. Cephalopods
Photo credit: MSC

18. More Octopi
Photo credit: MSC

19. Squids
Photo credit: MSC

20. The Chambered Nautilus
Photo credits: MSC

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

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