Callistoctopus rapanui

Callistoctopus rapanui, or the rapanui octopus, is the only endemic octopus species in Rapa Nui (or Easter Island). It was first described by Gilbert L. Voss in 1979 as Octopus rapanui.

Description
Callistoctopus rapanui is large and muscular, with a mantle length of up to 115 mm and a total length of up to 550 mm. It has scattered rough tubercles across the body. The arms are 3.5 to 4.5 times the length of the mantle, and have two rows of suckers each. C. rapanui is cream-gray with a darker purple hue on its dorsal surfaces. Its most distinctive feature is a "straight, out-turned" rostrum.

Distribution
Callistoctopus rapanui is subtropical and only known in Rapa Nui. It is benthic, and found at depths of 0 to 4 m.

Use by humans
Callistoctopus rapanui are fished for food in Rapa Nui, and make up 0.6% of subsistence fishing catch.