Opisthoteuthis pluto is a deep-sea cirrate octopus found off southern Australia in the bathyal zone.

[4] Like other members of the genus Opisthoteuthis, this octopus is sexually dimorphic, the males having enlarged suckers on distinct regions of the arms.

The species is distinct in lacking any distally enlarged suckers on the male.

[5] According to S. Stillman Berry, who described O. pluto, the octopus was capable of partially retracting its suckers and cirri (the small tendrils lining the arms).

[4] The octopus has a dark color, which helps it camouflage with the ocean floor.