06-landinvasion - 460:206 DINOSAURS Invasion of the Land:...

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Invasion of the Land: Terrestrial ecosystems before the evolution of the Dinosaurs 460:206 DINOSAURS
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Evolution of the Amphibians Amphibia "double life" life in water and on land
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Evolution onto Land What happened first???
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Problems with life on land:
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Seafloor: physical substrate similar to land Dilemma: breathing air
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Seafloor: physical substrate similar to land Dilemma: breathing air Lungfish
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Problem #1
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By this time a group of advanced fish had evolved nostrils and an internal air passage (must have had lungs by this point).
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What is the advantage to breathing air?
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Problem #2
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Limbs and Feet: Why become an Amphibian?
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Evolution of the Amphibians Amphibia "double life" life in water and on land
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Problem: Air-breathing Solution: Lungs, nostrils Problem: Structural support Solution 1: Limbs Solution 2: Vertebra
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Amphibia Cladogram
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Icthyostegalia Temnospondyli Anthracosauria Crossopterygii Lepospondyli Lissamphibia
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Order Crossopterygii Lobe-finned fish Paired fins Armour-like scales Devonian Carboniferous
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Order Crossopterygii found off coast of Africa in 1938 1999 discovered off Indonesia Extinct?
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06-landinvasion - 460:206 DINOSAURS Invasion of the Land:...

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