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Cephalopods – What are defining characteristics?

Cephalopods – What are defining characteristics? . Ocean-dwelling mollusks Foot is adapted to form tentacles around its mouth Not all have shells Closed circulatory system Carnivores . Cephalopods-eating habits. Carnivores! Uses tentacles to capture prey

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Cephalopods – What are defining characteristics?

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  1. Cephalopods – What are defining characteristics? • Ocean-dwelling mollusks • Foot is adapted to form tentacles around its mouth • Not all have shells • Closed circulatory system • Carnivores

  2. Cephalopods-eating habits • Carnivores! • Uses tentacles to capture prey • Usually crushes the prey in a beak and scrapes flesh with radula • Suckers on tentacles are sensitive –can feel touch and also taste food • https://www.youtube.com/watch?v=o1e1NhDh35g

  3. Cephalopods – nervous system • Large eyes ---excellent vision • Large brains –can learn and remember things

  4. Cephalopods--movement • Move by jet propulsion:squeeze a current of water out of the mantle cavity and through a tube • Like rockets, shoot off in the opposite direction • https://www.youtube.com/watch?v=qp2S5PXpH6s

  5. Cephalopods—Ink sac • Squid, Octopus, Cuttlefish have an ink sac • Squirt predators to distract them, to leave a foul taste behind, or even as a pseudomorph (ink looks like a shadow of themselves and act as a decoy)

  6. Cephalopod: amazing ability to camouflage • https://www.youtube.com/watch?v=1VjxvrXGEHk

  7. Squids Photo credit: MSC

  8. More Octopi Photo credit: MSC

  9. Cuttlefish

  10. The Chambered Nautilus Photo credits: MSC

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