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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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