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http://www.youtube.com/watch?v= NQkIyttPEoU

http://www.youtube.com/watch?v= NQkIyttPEoU. CHONDRICHTHYES. Brenna Pettersen , Brianna McClocklin , Zarria Mackey and Lyndsey Torcolacci. Classification. Kingdom – Animalia Phylum- Chordata Class – Chondrichthyes Subclasses: Elasmobranchii and holocephali.

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  1. http://www.youtube.com/watch?v=NQkIyttPEoU

  2. CHONDRICHTHYES Brenna Pettersen, Brianna McClocklin, Zarria Mackey and Lyndsey Torcolacci

  3. Classification • Kingdom – Animalia • Phylum- Chordata • Class – Chondrichthyes • Subclasses: Elasmobranchii and holocephali

  4. Distinguishing Characteristics • Cartilage skeletons • No swim bladder or lungs • Ectothermic • Internal fertilization • Gills • All carnivores

  5. Holocephali • Currently 30 known species • Limited to cold and salt water • Found at 200 – 2000 m • Closest living relative are sharks • Has grinding plates instead of teeth

  6. Elasmobranchii • Sharks, skates and rays • Five to seven gill pairs • Rigid dorsal fins and spines • Small placoid scales • Teeth are in series; upper jaw not fused to the cranium • Widely distributed in tropical and temperate waters

  7. Rays & Skates Rays • Plate-like teeth • Bear live young (viviparous) • Stinging spine Skates • Small teeth • Egg laying (oviparous) • Dorsal fin • No stinging spine • Oldest fossil record from 150 million years ago • Camouflage on sea floor

  8. Shark • Skin covered with denticles, which are small razor-sharp teeth • have very good senses • can be viviparous, oviparous or ovoviviparous • Over 400 species • Oldest species in the cartilaginous taxonomy

  9. Evolution • The earliest known cartilaginous fishes were ancient sharks that were descended from bony-skeleton placoderms. • Swam in oceans 420 mya, 200 mya before the first dinosaur appeared on land. • 40 million years ago the two subclasses divided

  10. Fun facts • Over 17% at risk with extinction • Ancient Greeks used electric rays as anaesthetic • More people are killed by vending machines than sharks • The largest ray is the Manta Ray which can have a 7 meter wing span.

  11. sources • http://vertebrates.voices.wooster.edu/chondrichthyes/ • http://www.seawater.no/fauna/chordata/Holocephali.html • ftp://ftp.fao.org/docrep/fao/009/y4160e/y4160e41.pdf • http://www4.bluevalleyk12.org/bvnw/jmohn/zoology/notes/phylum_chart_3.pdf • http://www.facebook.com/l.php?u=http%3A%2F%2Fen.wikipedia.org%2Fwiki%2FChondrichthyes&h=FAQHTyR7V • http://www.fish.wa.gov.au/Documents/recreational_fishing/fact_sheets/fact_sheet_rays.pdf • http://ocean.nationalgeographic.com/ocean/photos/ocean-rays/#/rays05-manta-ray-maldives_17861_600x450.jpg • http://www.flmnh.ufl.edu/fish/education/questions/raybasics.html • http://www.ucl.ac.uk/museums-static/obl4he/vertebratediversity/chondrichthyes.html • http://www.nhc.ed.ac.uk/index.php?page=493.470.475 • http://palaeo.gly.bris.ac.uk/palaeofiles/fossilgroups/chondrichthyes/Characters/synapomorphies.html

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