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Class cephalopoda
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Class Cephalopoda. “ Head/ Foot” Octopus, Squid, Nautilus, Cuttlefish. Rings of tentacles project from the anterior of the head region. Tentacles function to capture prey, for defense, in reproduction, and in locomotion . . * Range from ¾ inch to 59 feet long.

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Class Cephalopoda

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Class cephalopoda

Class Cephalopoda

“ Head/ Foot”

Octopus, Squid, Nautilus, Cuttlefish

Class cephalopoda

Rings of tentacles project from the anterior of the head region.Tentacles function to capture prey, for defense, in reproduction, and in locomotion.

Range from inch to 59 feet long

* Range from ¾ inch to 59 feet long

Most have internal shell. Ex. Squid

Others have no shell. Ex. Octopus

Nautiloids have large shell

2 types of cephalopods


  • 1. Nautiloids: covered by shell

Class cephalopoda

  • Produce large, coiled shells with chambers separated into sections called SEPTA.

  • Chambers are filled with gas and helps with buoyancy for swimming.

2 coleoids squid octopus cuttlefish

2. COLEOIDS: squid, octopus, cuttlefish

Class cephalopoda


    • bulky body

    • fins

    • 10 appendages (8 short arms, 2 long tentacles).

    • Small internal shell

Class cephalopoda

  • SQUID:

    • Large, cylindrical body

    • Paired fins that come from mantle tissue

    • Have 8 arms and 2 longer tentacles

    • Arms have cup-like suckers used to hold prey during capture.

    • Internal strip of hard protein within the squid called a PEN. It is extra support for the mantle.

Class cephalopoda

  • When disturbed- they cloud water with inky fluid.

  • Ink gland produces dark fluid called SEPIA which contains pigment called MELANIN.



  • Swim by jet propulsion produced by forcing water through a siphon.



  • They have a very complex nervous system.

  • Octopus can be trained to do simple tasks. Remember: the octopus opening the jar.

  • They can change shape and color for camouflage.

  • They communicate with others by coloration changes because they have CHROMATOPHORES (color changing cells).

Feeding and nutrition


  • Cephalopods are carnivores.

  • Their diet depends on the habitat.

  • To remove gastropods from their shells- octopods drill a hole through the shell with their RADULA and inject poison in them.

  • Squids tear prey with jaws



  • Sexes are separate and courtship is common.

  • Male squid have a modified arm that packages sperm and is used to put sperm into the females mantle cavity.

  • Once the egg is fertilized, it is released into the water column by oviduct.

  • Cephalopods usually only reproduce once in their lifetimes and then they die.

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