Transcript Class Cephalopoda

Class Cephalopoda
The “Head-Footed” Mollusks
Zoology
Cephalopods Walk on
Their Heads….
 The Class Cephalopoda includes the octopus ,
squid, Nautilus , devil fish, and Cuttlefish .
 Cephalopoda comes from the Greek words kephale
meaning head and podos meaning foot .
 Their modified foot is actually concentrated in the head
or cephalic region of their body. It forms a funnel that
rapidly removes water from the mantle cavity of the
body when the cephalopod moves.
 The anterior portion of the body is drawn into a circle
or crown of tentacles.
Do These Tentacles Make
Me Look Fat….
 Cephalopods range
upward in size from 2 cm
.
 The largest invertebrate
known on earth is the
giant squid (Architeuthis
.) It can reach 60 feet in
length and weighs nearly
a a ton .
 The giant squid has the
largest
eyes in the
animal kingdom. They
are 25 cm
in
diameter!
Umm…Have You Seen My
Shell?
 Most members of
Cephalopoda do not have a
visible shell .
 The Nautilus is the only
member of this class that still
has a shell. It uses the gas
chambers in its shell to
remain buoyant in the water.
 The squid
has a tiny
remnant
shell left on the
inside of its mantle
 The octopus
has lost its
shell completely over the last
time.
Moving On Up…
 Cephalopods are
very fast and agile
swimmers.
 They swim by
expelling water from
their mantle .
Judge Me By My Book…Not
My Cover
 Cephalopods are very
complex animals .
 They have complex
circulatory systems made
with a closed series of
vessels.
 Octopuses_ have very
complex nervous systems.
They are capable of learned
behaviors. Their eyes are
very complex with a lens,
cornea , and retina. They
can see in the water better
than a human .
 The octopuscan also use its
tentacles to detect textures
in objects.
Defending My Domain….
 Cephalopods exhibit
many complex
behaviors.
 The octopus and squid
can expel ink called
sepia as a defensive
behavior to fool and
evade predators .
 Octopus use their sharp
beaks
and strong
tentacles to capture
and harm prey. They are
one of the ocean’s most
powerful predators.