colossal squid

The colossal squid (Mesonychoteuthis hamiltoni, from Greek mesos (middle), nycho (claw, nail), and teuthis (squid)), sometimes called the Antarctic or giant cranch squid, is believed to be the largest squid species in terms of mass. It is the only known member of the genus Mesonychoteuthis. It is known from only a few specimens, and current estimates put its maximum size at long, based on analysis of smaller and immature specimens, making it the largest known invertebrate.