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Cephalopods

Cephalopods. Mackenzie Mertz. Cephalopods . Means “Head-Feet” in Greek Invertebrates There are two Different classes: The Tetrabranchia and The Dibranchia Only 400 species in existence. Cephalopods. Cephalopods are free-swimmers Many lead the life of active hunters and scavengers

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Cephalopods

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  1. Cephalopods Mackenzie Mertz

  2. Cephalopods • Means “Head-Feet” in Greek • Invertebrates • There are two Different classes: The Tetrabranchia and The Dibranchia • Only 400 species in existence

  3. Cephalopods • Cephalopods are free-swimmers • Many lead the life of active hunters and scavengers • Most active of all mollusks • Some can swim as fast as fish • Some have a chalky cuttlefish bone that can be used as a calcium supplement for birds and can be used for making toothpaste

  4. Cephalopods • Appeared first in the late Cambrian period several million years before the first primitive fish began swimming in the ocean • Have fast growing rates and live 1-3 years • Carnivorous • Movement is cause by jet propulsion

  5. Cephalopods • Cephalopods are the largest of all mollusks • Can range from a few inches to several feet • In order to camouflage themselves they can change their color and body shape • Most intelligent of all invertebrates • Cephalopods include: octopi, nautiluses, squid and cuttlefish

  6. Protection • Have a sac that produces brown or purplish black ink that is used to ward off predators • Can be used as a “Smoke Screen” • Use camouflage, like the picture on the left

  7. Habitat • Can not tolerate freshwater; only live in saltwater • Live in all of the earth’s moderate oceans; don’t live in polar or tropic oceans or seas

  8. Dibranchia • This group contains the squids, cuttlefishes, octopods and vampire squids • Have one single gill • Do not have a prominent shell or may not have one at all

  9. Tetrabranchia • Example: Nautilus • External shell and two pairs of gills • A sub-class of primitive mollusks

  10. Giant Squid (Architeuthis) • Can be 55 to 60 feet • Second largest mollusk • Feed on deep sea fish using tentacles • Only predator is the Sperm Whale • Live throughout the world’s oceans, but rare in the tropics and polar oceans

  11. Cuttlefish • Are fish but not mollusks • Have internal shell • Have eight arms and two tentacles • Eat shrimp and are the prey of sharks and seals • Live 1 to 2 years • Can change color and emit an ink in order to protect themselves

  12. Nautilus • Often considered to be living fossils • Have up to 90 tentacles • The top shell is darker in color and the underside is lighter; this is their form of camoflauge • Eat shrimp and small fish • Normally found at 300 m; raise to 100m for feeding and egg laying

  13. Octopus http://www.eveandersson.com/photos/japan/kuji-aquarium-octopus-5-large.jpg http://www.americanaquariumproducts.com/images/graphics/octopus.jpg

  14. Bibliography • http://images.google.com/imgres?imgurl=http://www.manandmollusc.net/advanced_introduction/Images/octopus-main1.jpg&imgrefurl=http://www.manandmollusc.net/advanced_introduction/moll101cephalopoda.html&usg=__G7IBsZXciY5JGzhK9zSfmIJKGcI=&h=279&w=315&sz=20&hl=en&start=19&um=1&tbnid=pq8fnw9MrkMZPM:&tbnh=104&tbnw=117&prev=/images%3Fq%3Dcephalopods%26hl%3Den%26sa%3DN%26um%3D1 • http://en.wikipedia.org/wiki/Giant_squid • http://www.starfish.ch/Fotos/molluscs-Weichtiere/cephalopods-Tintenfische/Octopus-marginatus2.jpg • http://www.thecephalopodpage.org/ • http://animaldiversity.ummz.umich.edu/site/accounts/information/Cephalopoda.html • http://science.nationalgeographic.com/staticfiles/NGS/Shared/StaticFiles/Science/Images/Content/swimming-nautilus-42-17992663-sw.jpg

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