Mollusks: Cephalopods  Octopus, Squid, Cuttlefish
Cephalopods <ul><li>Fierce Predators  </li></ul><ul><ul><li>Large brains  </li></ul></ul><ul><ul><li>Complex sensory struc...
Physical Characteristics <ul><li>Anterior </li></ul><ul><ul><li>Tentacles and jet propulsion  </li></ul></ul><ul><li>Mantl...
Locomotion  <ul><li>Jet like propulsion out of mantle  </li></ul><ul><ul><li>Squid: uses it for catching prey  </li></ul><...
Digestion  <ul><li>Enzymes digest food in stomach </li></ul><ul><ul><li>Moves to anus </li></ul></ul><ul><ul><li>Expelled ...
Nervous/Sensory System <ul><li>Very large brain  </li></ul><ul><ul><li>Dedicated to movement/control of tentacles  </li></...
Predator Adaptations <ul><li>Locate prey by sight </li></ul><ul><li>capture prey w tentacles/ suction cups  </li></ul><ul>...
Predator Adaptations  <ul><li>Chromatophores  </li></ul><ul><ul><li>Cells that can change colors  </li></ul></ul><ul><li>T...
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2 9-12

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2 9-12

  1. 1. Mollusks: Cephalopods Octopus, Squid, Cuttlefish
  2. 2. Cephalopods <ul><li>Fierce Predators </li></ul><ul><ul><li>Large brains </li></ul></ul><ul><ul><li>Complex sensory structures </li></ul></ul><ul><ul><li>Rapid locomotion </li></ul></ul><ul><ul><li>Grasping tentacles </li></ul></ul><ul><li>Octopus vs . Shark </li></ul>
  3. 3. Physical Characteristics <ul><li>Anterior </li></ul><ul><ul><li>Tentacles and jet propulsion </li></ul></ul><ul><li>Mantle (Shell) </li></ul><ul><ul><li>Nautilus: only cephalopod w external shell </li></ul></ul><ul><ul><ul><li>Fills it with gasses to help w buoyancy </li></ul></ul></ul><ul><ul><li>Squid: internal shell, helps with structure </li></ul></ul><ul><ul><li>Octopus: NO SHELL </li></ul></ul>
  4. 4. Locomotion <ul><li>Jet like propulsion out of mantle </li></ul><ul><ul><li>Squid: uses it for catching prey </li></ul></ul><ul><ul><ul><li>Up to 25 mph! </li></ul></ul></ul><ul><ul><li>Squid catching cameras. </li></ul></ul><ul><ul><li>Octopus: escape method </li></ul></ul>
  5. 5. Digestion <ul><li>Enzymes digest food in stomach </li></ul><ul><ul><li>Moves to anus </li></ul></ul><ul><ul><li>Expelled during jet propulsion </li></ul></ul>
  6. 6. Nervous/Sensory System <ul><li>Very large brain </li></ul><ul><ul><li>Dedicated to movement/control of tentacles </li></ul></ul><ul><ul><li>Very smart: octopus are known to problem solve </li></ul></ul><ul><ul><li>Curious </li></ul></ul><ul><li>Giant Octopus </li></ul><ul><li>Octopus Opening lid </li></ul><ul><li>Eyes: advanced, similar to vertebrate eyes </li></ul><ul><ul><li>Convergent evolution </li></ul></ul>
  7. 7. Predator Adaptations <ul><li>Locate prey by sight </li></ul><ul><li>capture prey w tentacles/ suction cups </li></ul><ul><ul><li>Tentacles reinforced w protein </li></ul></ul><ul><li>Eat using a radula </li></ul><ul><ul><li>Cuttlefish: small invertebrates </li></ul></ul><ul><ul><li>Octopus: </li></ul></ul><ul><ul><ul><li>Nocturnal: snails, fish, crustations </li></ul></ul></ul>
  8. 8. Predator Adaptations <ul><li>Chromatophores </li></ul><ul><ul><li>Cells that can change colors </li></ul></ul><ul><li>Tiny muscles contract or expand and chromatophores quickly change color </li></ul><ul><ul><li>Alarm response </li></ul></ul><ul><ul><li>Defensive </li></ul></ul><ul><ul><li>Blend in w environment </li></ul></ul><ul><ul><li>Courtship </li></ul></ul><ul><ul><li>Bioluminescence </li></ul></ul><ul><li>Cuttlefish in love </li></ul>

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