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Seven-Arm Octopus (Haliphron atlanticus)

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description Seven-Arm Octopus (Haliphron atlanticus) Overview

The seven-arm octopus, Haliphron atlanticus, is a large pelagic octopus in the family Alloposidae and occurs in deep and open waters across multiple oceans. Females can reach much greater sizes than males, making the species one of the heaviest known octopuses. Its common name refers to the male's specialized reproductive arm, the hectocotylus, which is coiled within a pouch beneath the eye and can therefore be difficult to see.

help Seven-Arm Octopus (Haliphron atlanticus) FAQ

Why is Haliphron atlanticus called the seven-arm octopus if octopuses have eight arms?

It actually has eight arms. In males, the reproductive arm called the hectocotylus is coiled inside a sac near the right eye, so the animal appears to have only seven visible arms.

How large can a female seven-arm octopus grow?

Females are among the heaviest known octopuses and can reach several meters in total length. Males are dramatically smaller, reportedly measuring only a small fraction of the largest females.

Where does the seven-arm octopus live?

Haliphron atlanticus is a pelagic species found in deep and open waters of the Atlantic, Pacific, and Indian oceans. Unlike a common octopus living in a rocky den, it spends much of its life in the water column.

Does Haliphron atlanticus hunt jellyfish?

Observations indicate that seven-arm octopuses interact with and consume gelatinous animals, including jellyfish. Females have even been observed carrying jellyfish remains, possibly using their stinging tentacles while feeding or defending themselves.

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