Most southern Sperm Whales are covered with scars from colossal squid hooks. The hooks seem to grab everyone’s attention (pun intended). On top of that, the colossal squid has hooks on its tentacles and arms positioned among its serrated suckers. Arm hooks. The colossal squid gets its scientific name, Mesonychoteuthis hamiltoni, from one of its distinguishing features. Specific mating behaviors are unknown in this species, but it reproduces via internal fertilization. Other diving mammals (including the southern elephant seal) and large Southern Ocean predators feed on juvenile colossal squid, but the sperm whale is the only species known to take adults. Colossal squid: Hooks and suckers tentacle club swivelling hook and arm sucker dissected out from the fleshy suckers Other squid families have hooks on the arms, or the tentacles, or both, but the colossal squid is the only hooked squid in its family (the Cranchiidae, about 20 species). The arm hooks are set in a double row in the middle of each arm, with the serrated suckers above and below... Suckers. Other squid families have hooks on the arms, or the tentacles, or both, but the colossal squid is the only hooked squid in its family (the Cranchiidae, about 20 species). Measuring longer than a school bus and sporting tentacles covered in razor-sharp hooks, the colossal squid is the stuff of nightmares. The arms and tentacles of the colossal squid Rotating tentacle hooks. It possesses hooks on each of the eight arms, and also on the two long tentacles, but the arm-hooks and tentacle-hooks are very different.
These hooks are designed for grappling slippery prey, such as the Antarctic toothfish, as well as defending against predators, such as the sperm whale. The tentacle hooks and the arm hooks are very different. The name comes from the Greek words mesos (middle), onycho (claw), and teuthis (squid), referring to the sharp hooks on the colossal squid's arms and tentacles. In contrast, the giant squid's tentacles bear suckers with small teeth.