Hydrozoan (Tubularia indivisa). Hydrozoa are a type of cnidarian and are related to corals and sea anemones.

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Keywords: animal, background, biological, biology, black, cnidaria, cnidarian, cnidarians, coelenterate, colonial, fauna, feeding, hydroid, hydroids, hydrozoa, hydrozoan, hydrozoans, indivisa, invertebrate, invertebrates, marine, nature, ocean, sea, structure, structures, tentacle, tentacled, tentacles, tubularia, underwater, wildlife, zoological, zoology