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8/19/2019 slides on snails etc
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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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8/19/2019 slides on snails etc
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"obust clubhook squid Moroteuthis robusta
8/19/2019 slides on snails etc
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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