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Chordates 2: Tetrapods

Chordates 2: Tetrapods. BIOL 1407. Amphibians. Tetrapods Moist skin External Fertilization Eggs need water. Amphibians. Aquatic larvae Metamorphosis Photo Credit of Tadpole: LiquidGhoul, 2008, Wikimedia Commons. Salamanders and Newts. Frogs and Toads. Caecilians. Reptiles. Amniotes

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Chordates 2: Tetrapods

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  1. Chordates 2:Tetrapods BIOL 1407

  2. Amphibians • Tetrapods • Moist skin • External Fertilization • Eggs need water

  3. Amphibians • Aquatic larvae • Metamorphosis • Photo Credit of Tadpole: LiquidGhoul, 2008, Wikimedia Commons

  4. Salamanders and Newts Frogs and Toads Caecilians

  5. Reptiles • Amniotes • Reproduce without water • Internal Fertilization • Tough keratinized skin • Scales and feathers made of keratin • Photo Credit: Doyle Cross, 2008

  6. Photo Credit of Red-throated Bee Eater: Tom Tarrant, 2008, Wikimedia Commons

  7. Avian Flight Adaptations • Forelimbs modified into wings • Flight feathers • Hollow bones • Beak • No teeth Photo Credit for Keel-billed Toucan: Supernova, 2006, Wikimedia Commons (originally posted on Flickr)

  8. Avian Flight Adaptations • Excellent vision • Big brains • Tiny large intestine • One ovary Photo Credit for White-Crowned Hornbills: Snowmanradio, 2008, Wikimedia Commons (originally posted on Flickr)

  9. Mammals • Hair • Mammary Glands • Three middle ear bones • Single lower jaw bone • Differentiated teeth • Photo Credit: Eric Mas Casas, 2008, Wikimedia Commons

  10. Monotremes • Lay eggs • Mammary glands • No nipples • Echidnas • Duck-billed platypus

  11. Photo Credit: Peter Scheunis, 2005, Wikimedia Commons

  12. Marsupials • Young are born very early • Finish development in marsupium = pouch

  13. Photo Credit of Wallaby and Joey: Benjamint444, 2008, Wikimedia Commons

  14. Photo Credit of Numbat: Gnangarra, 2006, Wikimedia Commons Photo Credit of Wallabies: Roland Zumbühl, 2004, Wikimedia Commons

  15. Eutherians = Placental Mammals • Placenta to nourish young within uterus • Born at late stage of development • Photo Credit: Nevit Dilmen, 2008, Wikimedia Commons

  16. Photo Credit: John Storr, 1997, Wikimedia Commons

  17. Photo Credit: John Storr, 1997, Wikimedia Commons

  18. The End Unless otherwise specified, all images in this presentation came from: Campbell, et al. 2008. Biology, 8th ed. Pearson Benjamin Cummings.Slide #18 is from 7th edition, Campbell, et al.

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