Mollusks and segmented worms
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Mollusks and segmented worms. Chapter 6, Section 3. Mollusks . Soft-bodied invertebrates that usually have a shell (ex. Snails, mussles , octopus) Have mantle and large muscular foot Mantle: thin layer of tissue that covers the mollusk’s soft body Water-dwelling mollusks have gills

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Mollusks and segmented worms

Mollusks and segmented worms

Chapter 6, Section 3


Mollusks
Mollusks

  • Soft-bodied invertebrates that usually have a shell (ex. Snails, mussles, octopus)

  • Have mantle and large muscular foot

    • Mantle: thin layer of tissue that covers the mollusk’s soft body

  • Water-dwelling mollusks have gills

    • Gills: organs in which carbon dioxide from the animal is exchanged for oxygen in the water

  • Land-dwelling mollusks have lungs

    • Lungs: carbon dioxide from the animal is exchanged for oxygen in the air


Mollusks body systems
Mollusks- body systems

  • Have digestive systems with two openings

  • Have scratchy, tonguelike organ called radula

    • Radula: has rows of fine, teethlike projections used to scrape off small bits of food

  • Have open circulatory system

    • Do not have vessels to contain blood

    • Blood washes over organs


Types of mollusks
Types of mollusks

  • Gastropods

    • Largest group of mollusks

    • Have one shell

    • Live in water or on land

    • Move about on a large, muscular foot

    • Secretion of mucus allows them to glide


Types of mollusks1
Types of mollusks

  • Bivalves

    • Has two shells joined by a hinge

    • Large, powerful muscles open & close shell

    • Gills filter water for food


Types of mollusks2
Types of mollusks

  • Cephalopods

    • Most complex type

    • Have internal plate instead of shell

    • Closed circulatory system

    • Adapted for quick movement in ocean

    • Have mantle surrounding internal organs


Segmented worms
Segmented worms

  • Annelids (earthworms, leeches, marine worms)- body made of repeating segments or rings that make worm flexible

  • Each segment has nerve cells, blood vessels, part of digestive system, coelom

    • Internal body cavity, separates internal organs from body wall

  • Closed circulatory system

  • Complete digestive system with two body openings


Exit ticket
Exit ticket

  • What are the characteristics of annelids?


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