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Well. telling why this is an Isopod is even more difficult than telling what species this is. I just recognize the species just by its habitus. I have seen this one over a hundred times. It is a crustacean for it has two pairs of antenna unlike any other invertebrate. This is hard to see on the photos because they are positioned dorsally and ventrally so the ventral ones are hard to spot. But I cannot tell you why this is an Isopod.