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Cephalopods (ii). By Sasha Georgiev Biology 9A. Phyla . Belongs to phyla called mollusca cephalo+poda = head+foot Octopus, squid, cuttlefish . Specific features. About 800 classified species 11,000 extinct species Found in all oceans of earth Do not tolerate freshwater

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cephalopods ii
Cephalopods (ii)

By Sasha Georgiev

Biology 9A

phyla
Phyla
  • Belongs to phyla called mollusca
  • cephalo+poda=head+foot
  • Octopus, squid, cuttlefish
specific features
Specific features
  • About 800 classified species
  • 11,000 extinct species
  • Found in all oceans of earth
  • Do not tolerate freshwater
  • One exception
  • Greatest diversity towards the equator
  • Occupies abyssal plain to surface
  • Advanced vision
  • Good camouflage
  • More than one heart
fossils
Fossils
  • Nautiloids– earliest cephalopods in fossil record
  • Late cambrian period
  • Simple shell shapes
life cycle of a cephalopod
Life cycle of a cephalopod
  • Ocassionally long lived
  • Mostly short life spam
  • Gain 12 percent body mass per day
  • They reproduce
  • After 1 to 2 years they die
reproduction in cephalopods
Reproduction in cephalopods
  • Semelparous reproduction
  • Iteroparity
  • Sexual reproduction
feeding of cephalopods
Feeding of cephalopods
  • Two part beak or radula
  • Symbiotic digestive juices
  • Digestive gland: crop, stomach, caecum and intestine
  • Radulae description
excretory system of cephalopods
Excretory system of cephalopods
  • Pericardial cavity filters waste
  • Delivered to renal sac
  • Inflation and deflation of branchial hearts
  • Release through pore
respiratory system of cephalopods
Respiratory system of cephalopods
  • Exchange of gasses with seawater
  • Water enters the cavity outside the gills
  • Contraction of the water
  • Jet propulsion
  • Deplasation depends on respiraton
circulatory system of cephallopods
Circulatory system of cephallopods
  • Only molluscs with closed circulatory system
  • Two gill hearts
  • A single systematic heart
  • Use of hemocyanin
nervous system of cephalopods
Nervous system of cephalopods
  • Most intelligent invertebrates
  • Brain to body mass ratio
  • Cartilageous cranium
  • Nerve fibers use
  • Highly adaptable
sensory system
Sensory system
  • Advanced vision (color blind)
  • Smell
  • Tentacles use
  • Hearing
  • Use of light (coloration)
  • Ink to confuse predators
any questions
Any questions????
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