Narcomedusa

Narcomedusa

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Credit: DAVID CARON/LOOK AT SCIENCES/SCIENCE PHOTO LIBRARY

Caption: Narcomedusa. Medusa stage (hydromedusa) of a hydrozoan (Solmaris sp.). Hydromedusae are the sexually reproductive stage of hydrozoan cnidarians. Hydrozoa normally live in large single-sex (dioecious) colonies made up of thousands of individual specialised polyps. The reproductive polyps bud-off asexually produced medusae. However, Narcomedusae often have either no, or a very reduced, polyp stage. When mature, medusae release gametes (sex cells) freely into the ocean. Gametes of opposite sexes combine to form free-swimming larval zygotes. These either settle on a suitable substrate, or swim and develop into another medusae or polyp directly. Photographed off the coast of Reunion Island, Indian Ocean.

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Keywords: 1, animal, aquatic, asia, asian, biological, biology, close-up, cnidarian, coelenterate, colonial, detail, dioecious, fauna, hydromedusa, hydrozoa, hydrozoan, indian ocean, invertebrate, invertebrates, jelly-fish, jellyfish, life cycle, life-cycle, marine, marine biology, medusa, micro organism, micro-organism, microbiological, microbiology, narcomedusa, nature, one, plankton, planktonic, reproduction, reproductive stage, reunion island, sea, see through, see-through, sexually active, single, solmaris sp., tentacle, tentacled, tentacles, translucent, transparent, tropical, tropics, under water, underwater, wildlife, zoological, zoology, zooplankton

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