The cephalopods

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The cephalopods

  1. 1. The Cephalopods Phylum Mollusca
  2. 2. Class Cephalopoda– “Head Foot” -Head and arms are distinguishing features -Many have ink -Many have beaks -Many have unique methods of camouflage
  3. 3. Examples:• Octopus – Head with 8 arms; all venomous, only one deadly to humans, most intelligent invertebrate• Squid – Longer, slender head with 8 arms & 2 tentacles, largest invertebrate• Nautilus – only Cephalopod with an external shell• Cuttlefish – internal shell (cuttlebone)
  4. 4. Anatomy• Exclusively marine• Prominent head• Arms for feeding, propulsion, reproduction• Many can expel ink to discourage predators• Very well developed eyes• Gills for respiration• Jet propulsion by squeezing body together quickly and jetting in the opposite direction• Bilateral symmetry
  5. 5. Habitat• Benthic – Highly Motile – Epifauna –live on seafloor – Have adapted to almost every marine environment in the world
  6. 6. Feeding-Most arepredators usingarms, tentacles,suckers tocapture thenbeak to rip preyapart
  7. 7. Cephalopod Feeding cont. – Beaks
  8. 8. Cephalopod Reproduction -Separate sexes -External fertilization and development -Distinct egg cases -Most types die after reproduction (many only living 1-2 years)
  9. 9. Octopus Camouflagehttp://www.youtube.com/watch?v=t-LTWFnGmeg&feature=endscreenAndhttp://www.youtube.com/watch?v=eS-USrwuUfA
  10. 10. CephalopodInternal Anatomy

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