Chordates 2: Tetrapods BIOL 1407. Amphibians Tetrapods Moist skin External Fertilization Eggs need...
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Transcript of Chordates 2: Tetrapods BIOL 1407. Amphibians Tetrapods Moist skin External Fertilization Eggs need...
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• Reproduce without
water • Internal Fertilization• Tough keratinized
skin• Scales and feathers
made of keratin• Photo Credit: Doyle Cross, 2008
Photo Credit of Red-throated Bee Eater: Tom Tarrant, 2008, Wikimedia Commons
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)
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)
Mammals
• Hair• Mammary Glands• Three middle ear
bones• Single lower jaw
bone• Differentiated teeth• Photo Credit: Eric Mas Casas, 2008,
Wikimedia Commons
Monotremes
• Lay eggs
• Mammary glands
• No nipples
• Echidnas
• Duck-billed platypus
Photo Credit: Peter Scheunis, 2005, Wikimedia Commons
Marsupials
• Young are born very early
• Finish development in marsupium = pouch
Photo Credit of Wallaby and Joey: Benjamint444, 2008, Wikimedia Commons
Photo Credit of Numbat: Gnangarra, 2006, Wikimedia CommonsPhoto Credit of Wallabies: Roland Zumbühl, 2004, Wikimedia Commons
Eutherians = Placental Mammals
• Placenta to nourish young within uterus
• Born at late stage of development
• Photo Credit: Nevit Dilmen, 2008, Wikimedia Commons
Photo Credit: John Storr, 1997, Wikimedia Commons
Photo Credit: John Storr, 1997, Wikimedia Commons
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.