Sarcopterygii
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Gogonasus[edit]
Eusthenopteron[edit]
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Fossil.
Panderichthys[edit]
Tiktaalik[edit]
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Note: This image is outdated. The first tetrapods were solely aquatic.
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Chasing smaller fishes.
Anatomy[edit]
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Tiktaalik fin.
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Tiktaalik skull.
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Tiktaalik skeleton.
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Comparison between fins of Tiktaalik, Panderichthys and Eusthenopteron, compared to the legs of 2 tetrapods ( Acanthostega and Ichthyostega ).
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Comparison betwwen fins and legs of several Sarcopterygii'n fishes and some tetrapods.