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Seven-arm octopus
The seven-arm octopus (''Haliphron atlanticus'') is one of the two largest known species of octopus; based on scientific records, it has a maximum estimated total length of and mass of . The only other similarly large extant species is the giant Pacific octopus, ''Enteroctopus dofleini''.
The genera ''Alloposina'' Grimpe, 1922, ''Alloposus'' Verrill, 1880 and ''Heptapus'' Joubin, 1929 are junior synonyms of ''Haliphron''.
==Description==
The seven-arm octopus is so named because in males the hectocotylus (a specially modified arm used in egg fertilization) is coiled in a sac beneath the right eye. Due to this species' thick gelatinous tissue, the arm is easily overlooked, giving the appearance of just seven arms. However, like other octopuses, it actually has eight.
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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