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The greater blue-ringed octopus ''(Hapalochlaena lunulata)'' is one of four species of venomous blue-ringed octopuses belonging to the octopodidae family. ==Description== The greater blue-ringed octopus is despite its vernacular name a small octopus whose size does not exceed 10 centimeters, arms included, for an average weight of 80 grams.〔Roper, Clyde & Hochberg, "Behavior and systematics of cephalopods from Lizard Island, Australia, based on color and body patterns" , MALACOLOGIA, 1988, 29(1): 153-193.〕 Its common name comes from the relatively large size of its blue ring (7 to 8 millimeters in diameter), so they are indeed larger than those of the other members of the genus and help to distinguish them.〔Roper, Clyde & Hochberg, "Behavior and systematics of cephalopods from Lizard Island, Australia, based on color and body patterns" , MALACOLOGIA, 1988, 29(1): 153-193.〕 The head is slightly flattened dorsoventrally and finished in a tip. Its height arms are short. The coloration of this octopus varies with the circumstances and the ambient environment from yellow ocher to light brown through whitish (when inactive). The blue rings are about 60, spread throughout the entire animal's coat.〔Mäthger,Bell, Kuzirian, Allen & Hanlon, "How does the blue-ringed octopus (Hapalochlaena lunulata) flash its blue rings? ", 2012, The Journal of Experimental Biology〕 The rings are roughly circular and are based on a darker blotch than the background color of the coat. A black line, whose thickness can vary to increase the contrast and be more visible, borders the electric blue circles. The blue rings are an aposematic adornment whose purpose is to clearly show to all potential predators that this octopus is highly poisonous. 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「Greater blue-ringed octopus」の詳細全文を読む スポンサード リンク
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