Sarcopterygii

Gogonasus

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Eusthenopteron

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  Fossil.

Panderichthys

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Tiktaalik

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  Note: This image is outdated. The first tetrapods were solely aquatic.
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  Chasing smaller fishes.
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Anatomy

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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.