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Chapter 27: Worms and Mollusks

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Chapter 27: Worms and Mollusks

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    1. Chapter 27: Worms and Mollusks Flatworms and roundworms Annelids Mollusks

    3. Flatworms Phylum Platyhelminthes Soft, flattened animals with cephalization and bilateral symmetry Acoelomates: 3 germ layers with no true body cavity (coelom) Most are parasitic Terms: pharynx, flame cells, ganglia, hermaphodite Sexual and asexual reproduction Examples: flukes, planaria, tapeworms

    4. Roundworms Phylum Nematoda No segments Pseudocoelom Parasitic Hookworms, trichinella, ascarid worms

    5. Annelids Earthworms Segmented True coelom ?coelomates Embryonic similarity to mollusks because of larval stage called trocophore Ecology: aeration of soils, castings increase nutrients in soil, food source

    6. Earthworm Anatomy

    7. Mollusks Soft-bodied with internal or external shell Foot, mantle, visceral mass, shell Uses a radula to feed Water enters and leaves through a siphon Gastropods: snails and slugs Bivalves: clams, mussels, scallops Cephalopods: squid, octopi, cuttlefish Food source, research, filter-feeders

    8. Slugs!

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