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The blue-ringed octopuses (genus ''Hapalochlaena'') are three (or perhaps four) octopus species that live in tide pools and coral reefs in the Pacific and Indian Oceans, from Japan to Australia. Their primary habitat is around southern New South Wales, South Australia, and northern Western Australia.〔Surf Lifesaving Training Manual, 32nd edition〕〔CBS News http://www.cbsnews.com/8301-202_162-57591718/tiny-but-deadly-spike-in-blue-ringed-octopus-sightings-sparks-fear-of-invasion-in-japan/〕 They are recognized as one of the world's most venomous marine animals. Despite their small size, , and relatively docile nature, they are dangerous to humans if provoked and handled, because their venom is powerful enough to kill humans. They can be identified by their characteristic blue and black rings, and yellowish skin. When the octopus is agitated, the brown patches darken dramatically, iridescent blue rings, or clumps of rings, appear and pulsate within the maculae. Typically, 50–60 blue rings cover the dorsal and lateral surfaces of the mantle. They hunt small crabs, hermit crabs, and shrimp. ==Classification== The genus was described by British zoologist Guy Coburn Robson in 1929. There are four confirmed species of ''Hapalochlaena'', and six possible species still being researched:〔 * Greater blue-ringed octopus (''Hapalochlaena lunulata'') * Southern blue-ringed octopus or lesser blue-ringed octopus (''Hapalochlaena maculosa'') * Blue-lined octopus (''Hapalochlaena fasciata'') * ''Hapalochlaena nierstraszi'' was described in 1938 from a single specimen from the Bay of Bengal, with a second specimen caught and described in 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「Blue-ringed octopus」の詳細全文を読む スポンサード リンク
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