1 / 13

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

quant
Download Presentation

Cephalopods (ii)

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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???? • ?????????????????????????????????????????????????????????????????????????????????????????????????????????

More Related