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Molluscs. Characteristic Snails, scallops, slugs, octopus, and squids Soft body, protected by a shell. Molluscs. Three common characteristics Mantle - soft outer tissue, produces shell Muscular foot - used for locomotion or attachment. Mollusc. Visceral mass - internal organs

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Molluscs


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    1. Molluscs • Characteristic • Snails, scallops, slugs, octopus, and squids • Soft body, protected by a shell

    2. Molluscs • Three common characteristics • Mantle - soft outer tissue, produces shell • Muscular foot - used for locomotion or attachment

    3. Mollusc • Visceral mass - internal organs • Some mollusks have an open circulatory system

    4. Mollusc • Movement • Slide - snails and slugs • Burrow - clams • Expel water - octopus and squid • Sessile - oysters

    5. Mollusc • Digestion • Double opening digestive tract • Straight - more primitive • Coiled - longer, increases the time food is digested • Eating • Filter feeders • Herbivores • Carnivores

    6. Mollusc • Nervous system • Range from barely any nervous system to highly advanced nervous system • Reproduction • Separate sexes • Reproduce sexually

    7. Mollusc • Origin and Diversity • 100,000 species • Coelomates - true coelom

    8. Mollusc • Classification • Shell type • Foot structure • Internal body arrangement • 7 Classes

    9. Mollusc • Polyplacophora - Chitons • Eight overlaping plates • Radula - tongue lined with teeth

    10. Mollusc • Gastropoda • Largest class • Snails and conches • More complex nervous system

    11. Mollusc • Bivalvia • Clam, mussel, scallop, oyster • Two shelled organisms • Filter feeders

    12. Mollusc • Cephalopoda • Nautiluses, cuttlefish, squid, octopus • Existed for 500 million years • Complex nervous system • Closed circulatory system