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Class Cephalopoda

the squids, octopus, nautilus, and cuttlefish

Richard E. Young, Michael Vecchione and Katharina M. Mangold

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Class Cephalopoda

• shell is present, reduced, or lost

• all are predacious with beak-like jaws• highly developed head and sensory organs (very

intelligent)

• closed circulatory system

• swim via jet propulsion• foot is lobed and forms tentacles• direct development (no larvae)

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Class Cephalopoda

• male transfers a spermatophore to female using a

special pair of tentacles

• female seals herself up in a den to lay eggs which

she attaches to the top of the den

• she cares for these eggs (in some species up to

6!months)• after the eggs hatch she usually dies

"eproduction

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Class Cephalopoda

#autilus$

• have a chambered shell that aids inmaintaining buoyancy

• chambers are filled with gas

siphuncle(cord of tissue

connected to

visceral mass)

chambers

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%mmonoids

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http://www.3d-fossiles.com/photos/fossiles/hammatoceras_speciosum.jpg

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Class Cephalopoda

&quids$

• have a reduced, internal shell calledthe pen

Cuttlefish$

• have a reduced, internal shell calleda cuttlefish bone

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"educed, internal shell

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'ioluminescence

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Class Cephalopoda

•  Architeuthis sp the second largest giant

squid found to date have been meters in

length

• they live in the deep sea

• sperm whales (*+m in length) are their

major predators

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 Mesonychoteuthis hamiltoni

Colossal &quid 

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"obust clubhook squid Moroteuthis robusta

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umbo .lying &quid Dosidicus gigas 

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Calamary 

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Class Cephalopoda

/ctopus$

• have lost the shell completely• most intelligent invertebrate

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0iant 1acific /ctopus

Octopus dofleini 

• 2his species is one of

the largest known

octopods3 theheaviest on record

weighed nearly 6

pounds

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0iant 1acific /ctopus

Octopus dofleini 

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• 4eadly venom and warning coloration

• 2he 'lue-ring /ctopus Hapalochlaena maculosa

• 5t kills prey by delivering a poison in the saliva 2he poison is a

neurotoin (maculotoin) that is strong enough to kill a human

being 

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2he recently discovered mimic octopus (Octopus horridus)

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 Argonauta nodosa

2he paper nautilus

• 2he paper nautiluses,

 Argonauta sp, are not

nautiluses at all, they are

octopuses7

• 2he paper thin white

calcareous 8shell8 is

actually an egg case

made by females