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

“ 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

Most have internal shell. Ex. Squid

Others have no shell. Ex. Octopus

Nautiloids have large shell


  • 1. Nautiloids: covered by shell

  • 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


    • bulky body

    • fins

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

    • Small internal shell

  • 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.

  • 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).


  • 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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