>>16538236
>LE CONVERGENT
Lamarckist fallacy. Convergent evolution only proves having a dorsal fin works well.

HOW is it possible in the first place to have the potential to grow such an odd thing in your back? The dolphin's dorsal fin is not an overgrown vertebra which would be the more intuitive way to imagine it. No, one day an embryo decided to clump more cells in this specific segment, not any others, it clumped so many in there it grew away from the body like a sword of sorts.

This is why I ask for embriological origin, how do we recognize if any other animal has the potential to develop a dorsal fin there, what is the process that allows for such particular growth?

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How the hell is this possible? What are dolphin fins made of? What are their embriological origin? Anyone has histology cuts of one?