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Exploring Mollusks: A Guide to their Anatomy, Classification, and Importance

Discover the fascinating world of mollusks - soft-bodied invertebrate animals with various body parts and shells. Learn about their movement, classification, and the different classes of mollusks. Explore photos and illustrations of snails, clams, cephalopods, and more.

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Exploring Mollusks: A Guide to their Anatomy, Classification, and Importance

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  1. Photo credit: MSC

  2. 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 • Muscular organ to move, dig, slide… • Radula • 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

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