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Cephalopods (ii)

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)

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  1. Cephalopods (ii) By Sasha Georgiev Biology 9A

  2. Phyla • Belongs to phyla called mollusca • cephalo+poda=head+foot • Octopus, squid, cuttlefish

  3. 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

  4. Fossils • Nautiloids– earliest cephalopods in fossil record • Late cambrian period • Simple shell shapes

  5. 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

  6. Reproduction in cephalopods • Semelparous reproduction • Iteroparity • Sexual reproduction

  7. Feeding of cephalopods • Two part beak or radula • Symbiotic digestive juices • Digestive gland: crop, stomach, caecum and intestine • Radulae description

  8. Excretory system of cephalopods • Pericardial cavity filters waste • Delivered to renal sac • Inflation and deflation of branchial hearts • Release through pore

  9. 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

  10. Circulatory system of cephallopods • Only molluscs with closed circulatory system • Two gill hearts • A single systematic heart • Use of hemocyanin

  11. Nervous system of cephalopods • Most intelligent invertebrates • Brain to body mass ratio • Cartilageous cranium • Nerve fibers use • Highly adaptable

  12. Sensory system • Advanced vision (color blind) • Smell • Tentacles use • Hearing • Use of light (coloration) • Ink to confuse predators

  13. Any questions???? • ?????????????????????????????????????????????????????????????????????????????????????????????????????????

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