Opisthoteuthis extensa is a species of octopus found off the west coast of Sumatra, an Indonesian island.

[4] O. extensa lives in a benthic habitat, like many other cirrate octopuses.

[2] It occupies a deep part of the ocean where little sunlight penetrates.

The species has not been studied in-depth; not much is known besides its habitat and anatomical description.

[5] The type specimen, upon which the description is based, has small suckers, small eyes, and arms that do not vary much in length.