2 9-12

Mollusks: Cephalopods Octopus, Squid, Cuttlefish

Cephalopods
Fierce Predators
Large brains
Complex sensory structures
Rapid locomotion
Grasping tentacles
Octopus vs . Shark

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

Locomotion
Jet like propulsion out of mantle
Squid: uses it for catching prey
Up to 25 mph!
Squid catching cameras.
Octopus: escape method

Digestion
Enzymes digest food in stomach
Moves to anus
Expelled during jet propulsion

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

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

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

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2 9-12

by Leeanna Cota

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