colossal squid

:  an extremely large squid (Mesonychoteuthis hamiltoni) occurring in deep waters of the Southern Ocean that is the largest known living invertebrate … would like to try for observations of the colossal squid, the only one larger than a giant squid. Discovered only in the 1920s, colossal squid live in the Antarctic Ocean and grow to perhaps 46 feet. — Dan Vergano, USA Today, 25 Jan. 2013 Fishermen working in the Antarctic have landed a huge surprise: the first adult colossal squid, Mesonychoteuthis hamiltoni. A New Zealand vessel was deep fishing when it caught the squid, which is said to be male, 10 metres long and 450 kilograms in weight … — New Scientist, 3 Mar. 2007