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Lecture 17 Outline Chapter 34 - Crampton Bio II Lecture...

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Crampton Bio II Lecture Handouts Lecture 17 Lecture 17 Chordates II Slide 01: Lobe-finned fishes + tetrapods Key synapomorphy: Lobe fins or legs derived from lobed fins. Slide02: Actinistia: Coelacanths - marine Thought extinct for 60 My Discovered in 1938 off South Africa by Marjorie Courtney Latimer Slide 03: Dipnoi + Tetrapods Slide 04: Dipnoi: Lungfish Have true lungs! Also have gills Survive seasonal desiccation by Aestivating in mud Slide 05: Lepidosiren paradoxa : South American lungfish More closely related to a human than to a fish Slide 06: Dipnoi to Tetrapods Series of lineages (all extinct) showing intermediate stages between lungfish (aquatic) and tetrapods. Only amphibians + amniote lineages survived. Tetrapod synapomorphy = walking legs, with feet and digits Slide 07: 1
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Crampton Bio II Lecture Handouts Lecture 17 Slide 08: Panderichthys : is a lobe-finned fish. Aquatic Elginerpeton is a tetrapod (amphibious) Tiktaliik has intermediate characters. new characters include: movable neck, digits Fig. 34.20 shows a TRANSITION SERIES .. stages in evolution from WATER to LAND Slide 09: The transition to land: How?
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