Siphonophorae or Siphonophora, the siphonophores, are an order of the Hydrozoa, a class of marine invertebrates belonging to the phylum Cnidaria. They are colonial, but the colonies can superficially resemble jellyfish.
Although they appear to be a single organism, each specimen is actually a colony of Siphonophorae. The best known species is the dangerous Portuguese Man o' War.
(via Dark Roasted Blend)
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