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"Complexity" is a difficult term to operate with in biology; most people that use it don't have an idea of how they'd like to operationally define it, and without an operational definition it isn't meaningful. Phages are effectively parasites of bacteria - one could bicker that a virus can't be a parasite because it's not "alive", but I ...


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Given the rough shape I lean towards an ectoparasitic isopod. I have no idea which one of the roughly 2700 species it might be, but I would guess from a quick search that it probably belongs to the families Cymothoidae or Gnathiidae as these seem to be the more common and well described (at least they have more complete Wikipedia entries, wheras the other ...


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