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Anthomedusae; Anthomedusae or Anthomedusa, the athecate hydroids, are an order of the Hydrozoa, a class of marine invertebrates belonging to the phylum Cnidaria. A profusion of alternate scientific names exists for this long-known, heavily discussed and spectactular group - it has also been called Gymnoblastea, or, with or without an emended ending "-ae", Anthoathecata, Athecata, Hydromedusa or Stylasterina. There are about 1,200 species worldwide. - There is a border around the image. Image size is correct. Many sizes available.
