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