Vertebrates2_Lecture - Today Vertebrates Part II(Chapter 15...

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Today: Vertebrates, Part II (Chapter 15) Next Time: History of Geologic Thought (Review Ch. 11-15)
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Tetrapods Amphibians Amniotes Reptiles (Diapsids) Dinosaurs Swimming reptiles Flying reptiles Birds Synapsids Pelycosaurs Mammals Diversity and convergent evolution Chapter 15: Vertebrates 2 Next lecture: Chapters 11-15
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lungfish some time on land Review: Lobe-Finned Fish http://www.nhm.ac.uk/
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Tetrapods tetrapods : 4-limbed vertebrates and their descendents most have four limbs with digits most have lungs no internal gills ear bones muscular tongue
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Tetrapods legs land no legs water
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Tetrapods tetrapods Cladogram: Vertebrates
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Tetrapods Amphibians Amniotes Reptiles (Diapsids) Dinosaurs Swimming reptiles Flying reptiles Birds Synapsids Pelycosaurs Mammals Diversity and convergent evolution Chapter 15: Vertebrates 2 Next lecture: Chapters 11-15
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Tetrapods: Amphibians (Figure 15-6)
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(Figure 15-6) ~ 400 m.y. Tetrapods: Amphibians
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New Features: legs, shoulder/pelvis girdles, ear bones Feeding Habits: initially predators Hey-day: late Paleozoic Examples: frogs, salamanders Tetrapods: Amphibians www.sosalliance.org/
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Ichthyostega 4 legs scales fish shape and tail Tetrapods: Amphibians c. 1955 c. 2002 http://www.devoniantimes.org/Order/re-ichthyostega.html ??
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Acanthostega Digits, but still no wrists/ankles Limbs, pelvis, spine can’t support much weight Short, thin ribs – organs poorly protected Internal, fish-like gills Found in river deposits ~2 feet long Tiktaalik Broad, flat “crocodylian” skull Pectoral girdle separate from skull: neck! Found in meandering lowland stream deposits http://www.devoniantimes.org Panderichthys Tetrapod-like head Forelimbs developing; humerus getting longer No “fishy” dorsal/anal fins
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