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- Illustration showing how much the hindlimb attachments in lobe-finned fishes need to change in transitioning from lobe-finned fishes to early tetrapods if the fish was to become a terrestrial animal. (en)
- Comparison between the fins of lobe-finned fishes and the legs of early tetrapods: 1. Tiktaalik 2. Panderichthys 3. Eusthenopteron 4. Acanthostega 5. Ichthyostega (en)
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