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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

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 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
Produce large, coiled shells with chambers separated into sections called SEPTA.
  • Chambers are filled with gas and helps with buoyancy for swimming.
    • bulky body
    • fins
    • 10 appendages (8 short arms, 2 long tentacles).
    • Small internal shell
    • 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).
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.