I would say - why not an amphi? A land plus a sea dweller.
A totally aquatic creature would limit it's design features. Also, since our creature (we really need to name our planet soon! It is depressing to refer to it as we do currently) should be numero uno in the planet, it would impractical to consign it to one habitat.
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Adieu science, hi consumerism : Pi = Bye = Buy
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