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Mollusks

Mollusks. Chapter 10 Section 1. Clams, oysters, scallops, snails, squids Invertebrates with soft, unsegmented bodies Often protected by hard outer shell (protects soft body) Mantle: thin layer of tissue that covers internal organ, produces the hard shell

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Mollusks

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  1. Mollusks Chapter 10 Section 1

  2. Clams, oysters, scallops, snails, squids • Invertebrates with soft, unsegmented bodies • Often protected by hard outer shell (protects soft body) • Mantle: thin layer of tissue that covers internal organ, produces the hard shell • Foot: adapted for crawling, digging, catching prey Characteristics of Mollusks

  3. Bilateral symmetry • Digestive system, 2 openings • Internal organs located in one area Mollusk: Body Structure

  4. Body Structures

  5. Open circulatory system • Blood is not inside blood vessels • Blood sloshes over the organs and returns eventually to the heart Mollusks: Circulatory System

  6. Mollusks that live in water have gills • Gills: organs that remove oxygen from the water • Cilia: tiny, hairlike structures that move water over the gills Mollusks: Obtaining Oxygen

  7. GASTROPODS • BIVALVES • CEPHALOPODS • Classified by… presence of shell, type of shell, type of foot, complexity of nervous system Three Major Groups of Mollusks

  8. Snails and slugs • Largest group of mollusks • Live everywhere on Earth • Single external shell or no shell at all GASTROPODS

  9. Herbivores • Eat only plants • Carnivores • Animals that eat only other animals • Scavengers • Radula: a flexible ribbon of tiny teeth that scrapes food from a surface GASTROPODS: Obtaining Food

  10. Oysters, clams, scallops, mussels • Mollusks that have two shells held together by hinges and strong muscles • NO RADULAS, strain tiny organisms from water with the use of their gills • Omnivores: eat both plants and animals BIVALVES

  11. Oysters and mussels attach themselves to rocks or underwater surfaces • Clams can burrow the mud by changing the shape of its foot • Grain of sand gets stuck between mantle and shell… PEARL! BIVALVES (cont.)

  12. Octopus, squids, nautilus, cuttlefish • Ocean dwelling mollusk whose foot is adapted to form tentacles around its mouth • Carnivores • Use tentacles containing sensitive suckers to capture food • Suckers receive sensations of taste as well as touch • Don’t have to touch something to taste it CEPHALOPODS

  13. Large eyes • Excellent vision • Most complex nervous system of any invertebrate • Large brains, can remember things they have learned • Jet propulsion CEPHALOPODS (cont.)

  14. An Escaping Octopus

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