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Nature 441, xi (4 May 2006) | doi:10.1038/7089xib; Published online 3 May 2006

Abstractions

There's an evolutionary gap between two kinds of primitive bony fish — it separates the sarcopterygian (lobe-finned fishes) from the actinopterygian (ray-finned fishes). Many early sarcopterygian fishes were covered in a hard tissue known as cosmine, which is unknown in any living vertebrates.

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