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Atolla jellyfish
''Atolla wyvillei'', also known as Atolla jellyfish or Coronate medusa, is a species of deep-sea crown jellyfish (Scyphozoa: Coronatae).〔Cornelius, P. (2012). Atolla wyvillei. Accessed through: World Register of Marine Species at http://www.marinespecies.org/aphia.php?p=taxdetails&id=135282 on 2012-12-17〕 It lives in oceans around the world.〔Russell, F.S., 1970. ''The medusae of the British Isles. II. Pelagic Scyphozoa with a supplement to the first volume on Hydromedusae''. Cambridge University Press, Cambridge, 284 pp.
〕 Like many species of mid-water animals, it is deep red in color. This species was named in honor of Sir Charles Wyville Thomson, chief scientist on the Challenger expedition.
It typically has 22 marginal tentacles and one hypertrophied tentacle which is larger than the rest.〔Boltovskoy, D., editor, 1999. ''South Atlantic Marine Zooplankton'' cited in Marine Species Identification Portal: http://species-identification.org/species.php?species_group=zsao&id=2415〕 This long trailing tentacle is thought to facilitate prey capture.〔Hunt, J.C. & D.J. Lindsay, 1998. Observations on the behavior of ''Atolla'' (Scyphozoa: Coronatae) and ''Nanomia'' (Hydrozoa: Physonectae): use of the hypertrophied tentacle in prey capture. ''Plankton Biology and Ecology'', 45, 239-242.〕
This species is bioluminescent.〔Herring, P.J. & E.A. Widder, 2004. Bioluminescence of deep-sea coronate medusae (Cnidaria: Scyphozoa). ''Marine Biology'', 146: 39-51〕 When attacked, it will launch a series of flashes, whose function is to draw predators who will be more interested in the attacker than itself. This has earned the animal the nickname "alarm jellyfish".
==References==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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