Biodiversity & Conservation

MarLIN Glossary

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Hydrozoa
The Class Hydrozoa (of Phylum Cnidaria) are characterized by large colonies of simple polyps. The polyp (or polypoid) form dominates. Polyps vary in structure but take the general form of a central mouth and buccal cavity surrounded by stinging tentacles. Polyps arise from a series of tubular stolons and stalks that are covered in a chitinous sheath. Colonies take the form of mats of stolon, with upright stems that may form delicate branching structures (adapted from Hayward et al. 1996). Exceptions exist, such as the By-the-Wind-Sailor (%Velella velella%) and Siphonophores.

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Glossary references