Alicella

Alicella gigantea is an amphipod inhabiting the deep sea, the largest species ever observed, with some individuals reaching up to 34 centimetres (13 in) long; this species is an example of abyssal gigantism. The monotypic Alicella lives only at great depths; the first specimens were collected at the end of the 19th century from the Madeira Abyssal Plain, and subsequent specimens have been found on other abyssal plains of both the Atlantic and Pacific Oceans, as well within ocean trenches and fracture zones.