What is Seven-arm octopus?
{{Taxobox | name = Seven-arm octopus | image = Haliphron atlanticus (70 mm ML).jpg | image_width = 100px | regnum = [[Animal]]ia | phylum = [[Mollusc]]a | classis = [[Cephalopod]]a | ordo = [[Octopoda]] | familia = '''Alloposidae''' | genus = '''''Haliphron''''' | binomial = ''Haliphron atlanticus''}} The '''seven-arm octopus''' (''Haliphron atlanticus''), also known as the '''septopus''' or the '''heptopus''', is claimed to be the largest octopus. The claim is based on a partial specimen, and the estimation is of a 4 metre length and a weight of 75 kg. The [[North Pacific giant octopus]] is its rival in size. In 2002, a single specimen of giant proportions was caught by fisheries trawling off the eastern Chatham Rise, [[New Zealand]]. This specimen, the largest of this species and of all octopuses, was the first validated record of Haliphron from the South Pacific. It had a mantle length of 0.69 m, total length of 2.90 m, and weight of 61.0 kg, although it was incomplete. ==Description== [[File:Haliphron atlanticus oral view.jpg|thumb|left|A view of the underside]] The seven-arm octopus gets its name because the male's [[hectocotylus]] (a specially modified arm used in egg fertilization) is coiled in a sac beneath the right eye. {{-}} {{biology-stub}} [[Category:Cephalopods]]