this post was submitted on 07 Dec 2023
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Counter-counterpoint: both species come from the same tree of life, several of their traits taken for granted come from previous species' adaptation, e.g. bilateral symmetry. When you see, say, a molusk with the same bodyplan as a shark, we can talk about it being a common possibility.
What about the whole crabification thing?
While carcinisation does exist as a phenomenon, I believe all examples involve animals of the same order, i.e. it's even less extreme than comparing a shark and a dolphin.
Ah fair enough.