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Lecture 6 ANIMAL EVOLUTION: THE VERTEBRATES

Lecture 6 ANIMAL EVOLUTION: THE VERTEBRATES. Lobe-finned fishes. Have fleshy ventral fins reinforced with external skeleton. Lungfishes. Have gills and one or two small modified outpouchings of the gut wall. These sacs help in taking in O 2 and to remove CO 2 .

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Lecture 6 ANIMAL EVOLUTION: THE VERTEBRATES

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  1. Lecture 6ANIMAL EVOLUTION: THE VERTEBRATES

  2. Lobe-finned fishes • Have fleshy ventral fins reinforced with external skeleton

  3. Lungfishes • Have gills and one or two small modified outpouchings of the gut wall. • These sacs help in taking in O2 and to remove CO2. • Probably share the common ancestor with four-legged walkers-tetrapods.

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