Seven-arm Octopus

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Seven-arm Octopus
Scientific classification
Kingdom: Animalia
Phylum: Mollusca
Class: Cephalopoda
Order: Octopoda
Family: Alloposidae
Verrill, 1881
Genus: Haliphron
Steenstrup, 1861
Species: H. atlanticus
Binomial name
Haliphron atlanticus
Steenstrup, 1861

The Seven-arm Octopus (Haliphron atlanticus) 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[change | change source]

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.