1. The Cephalopods
Phylum Mollusca

2. Class Cephalopoda– “Head Foot”
-Head and arms are distinguishing features
-Many have ink
-Many have beaks
-Many have unique methods of camouflage

3. Examples:
• Octopus – Head with 8 arms;
all venomous, only one deadly
to humans, most intelligent
invertebrate
• Squid – Longer, slender head
with 8 arms & 2 tentacles,
largest invertebrate
• Nautilus – only Cephalopod
with an external shell
• Cuttlefish – internal shell
(cuttlebone)

4. Anatomy
• Exclusively marine
• Prominent head
• Arms for feeding, propulsion, reproduction
• Many can expel ink to discourage predators
• Very well developed eyes
• Gills for respiration
• Jet propulsion by squeezing body together quickly
and jetting in the opposite direction
• Bilateral symmetry

5. Habitat
• Benthic
– Highly Motile
– Epifauna –live on
seafloor
– Have adapted to
almost every
marine
environment in the
world

6. Feeding
-Most are
predators using
arms, tentacles,
suckers to
capture then
beak to rip prey
apart

7. Cephalopod Feeding cont. – Beaks

8. Cephalopod Reproduction
-Separate sexes
-External
fertilization and
development
-Distinct egg
cases
-Most types die
after
reproduction
(many only living
1-2 years)

9. Octopus Camouflage
http://www.yout
ube.com/watch?
v=t-
LTWFnGmeg&fea
ture=endscreen
And
http://www.yout
ube.com/watch?
v=eS-USrwuUfA

10. Cephalopod
Internal Anatomy