Any of various marine gastropods of the suborder Nudibranchia having a shell-less and often beautifully colored body.
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You see, the nudibranch packs a punch-ina very unusual way.
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The biology of nudibranch larvae.
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There are around 80 species found of nudibranchs found in New Zealabd waters.
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Absurd Creatures: The Nudibranch Is Gorgeous, So You Should Never Touch It Look at the nudibranch.
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All these Nudibranchs live in much the same way: why would not the same mould have done for them all?