Megaleledone
Megaleledone setebos, the giant Antarctic octopus, is a very large octopus with a circum-Antarctic distribution. It grows to at least 28 cm in mantle length and 90 cm in total length. "M. setebos" feeds by drilling small holes in large, shelled mollusks, and then injecting its toxic saliva. The venom even works at subfreezing temperatures. This species was transferred to the genus Megaleledone and synonymised with "Megaleledone senoi" in a 2003 paper.