Opisthoteuthis massyae is an octopus living in the eastern Atlantic Ocean.

O. massyae occupies the benthic zone (seafloor and water immediately above) of the open ocean.

[1] It's found as far north as Ireland, in the Rockall Basin,[3] and as far south as Namibia.

[a][5] O. massyae is a carnivore; it probably catches prey by enveloping small animals within its web, similar to some other cirrate octopods.

[7] It eats a variety of small prey: gammarid amphipods, polychaetes, decapods, opossum shrimp, copepods, isopods, tanaids, marine snails, marine slugs, and bivalves.