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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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