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''Taningia danae'', the Dana octopus squid, is a species of squid in the family Octopoteuthidae. It is one of the largest known squid species, reaching a mantle length of 〔Nesis, K.N. 1982. ''Abridged key to the cephalopod mollusks of the world's ocean''. Light and Food Industry Publishing House, Moscow. 385+ii pp. (into English by B. S. Levitov, ed. by L. A. Burgess 1987. ''Cephalopods of the world''. T.F.H. Publications, Neptune City, NJ. 351pp. )〕 and total length of .〔 The largest known specimen, a mature female, weighed .〔Roper, C.F.E. & P. Jereb 2010. Family Octopoteuthidae. In: P. Jereb & C.F.E. Roper (eds.) ''(Cephalopods of the world. An annotated and illustrated catalogue of species known to date. Volume 2. Myopsid and Oegopsid Squids )''. FAO Species Catalogue for Fishery Purposes No. 4, Vol. 2. FAO, Rome. pp. 262–268.〕 ''Taningia danae'' is named after Danish fisheries biologist Åge Vedel Tåning (1890–1958), who often traveled on the research vessel ''Dana''. ==Hunting behaviour and bioluminescence== In 2005, a Japanese research team headed by Tsunemi Kubodera managed to film ''T. danae'' in its natural habitat for the first time. The video footage, shot in deep water off Chichi-jima in the northern Pacific Ocean, shows ''T. danae'' emitting blinding flashes of light from photophores on its arms as it attacks its prey. It is believed that this highly maneuverable squid uses the bright flashes to disorientate potential prey. These flashes may also serve to illuminate the prey to make for easier capture as well as a courtship and territorial display.〔Kubodera, T., Y. Koyama & K. Mori 2006. ''Proceedings of the Royal Society B: Biological Sciences'' 274(1613): 1029–1034. 〕 As well as a predatorial characteristic, Dana bioluminescence has also been suggested to be a defense mechanism. Juveniles of this species have been observed moving rapidly in the direction of potential predators, as if hunting, to disorientate and startle the threat with a mock attack.〔Young, R.E. & M. Vecchione 1999. (''Taningia danae'' Joubin, 1931 ). Version 1 January 1999. Tree of Life web project.〕 In 2012, ''Taningia danae'' was filmed twice more during a search for the giant squid for the Discovery Channel Special, ''Monster Squid: The Giant Is Real''.〔''Monster Squid: The Giant Is Real''. Discovery Channel.〕 Remains of Dana octopus squid have, on occasion, been found washed ashore on beaches. In 2008, a mantle of ''T. danae'' was discovered by students in Bermuda's Grape Bay, while tentacle remnants were found further along the shore.〔Dale, A. 2008. ("Monster from the Deep" ). ''Bermuda Royal Gazette'', July 8, 2008.〕 In early 2013, a specimen with a length (excluding arms) of was trawled at a depth of off the coast of Estaca de Bares, Galicia, Spain. It was loaned to the Spanish Institute of Oceanography.〔(Aparece en Galicia un calamar gigante de 54 kilos y más de un metro de largo ). Europa Press, 11 February 2013. 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Taningia danae」の詳細全文を読む スポンサード リンク
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