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Caption: Hydromedusa. Medusa stage of the hydrozoan Sarsia tubulosa. Hydromedusae are the sexually reproductive stage of hydrozoan cnidarians. Hydrozoa live in large single-sex (dioecious) colonies made up of thousands of individual specialised polyps. Reproductive polyps bud-off asexually produced medusae. When mature, the medusae release gametes (sex cells) freely into the ocean. Gametes of opposite sexes, from different colonies, then combine to form free-swimming larval zygotes, that either settle on a suitable substrate, or swim and develop into another medusae or polyp directly.

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Keywords: animal, aquatic, biological, biology, close-up, cnidarian, colonial, detail, dioecious, fauna, hydromedusa, hydrozoa, hydrozoan, invertebrate, invertebrates, jelly-fish, jellyfish, life cycle, life-cycle, marine, marine biology, medusa, micro organism, micro-organism, microbiological, microbiology, nature, plankton, planktonic, reproduction, reproductive stage, sarsia tubulosa, sea, see through, see-through, sexually active, tentacle, tentacled, tentacles, translucent, transparent, under water, underwater, wildlife, zoological, zoology, zooplankton

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