- Seven-arm Octopus
Seven-arm Octopus Ventral view of young female (70 mm ML) Lateral view of young male Scientific classification Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Order: Octopoda Superfamily: Argonautoida Family: Alloposidae
Species: H. atlanticus Binomial name Haliphron atlanticus
- Alloposus mollis
- ?Octopus alberti
- Alloposus pacificus
Ijima & Ikeda, 1902
- Heptapus danai
- Alloposus hardyi
- ?Alloposina albatrossi
The Seven-arm Octopus (Haliphron atlanticus) is the largest known species of octopus based on scientific records, with a total estimated length of 4 m and weight of 75 kg. However, there have been claims of even larger octopuses of the species Enteroctopus dofleini.
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.
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.
The genera Alloposina Grimpe, 1922, Alloposus Verrill, 1880 and Heptapus Joubin, 1929 are junior synonyms of Haliphron.
- Bakken, T. & T. Holthe 2002. Haliphron atlanticum (Cephalopoda, Alloposidae) caught in Skorafjorden (64°N), Norway. Fauna norv. 22: 37-38.
- Willassen, E. 1986. Haliphron atlanticus Steenstrup (Cephalopoda: Octopoda) from the coast of Norway. Sarsia 71: 35-40.
- CephBase: Seven-arm Octopus
- Tree of Life web project: Haliphron atlanticus
- The giant octopus Haliphron atlanticus (Mollusca: Octopoda) in New Zealand waters
- BBC News: Giant octopus puzzles scientists
- Tony Wu Underwater Photography: Seven-arm Octopus
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- Alloposus mollis