Giant octopus

The Giant octopus is Enteroctopus, and one of its species is the largest octopus. There are four species: the North Pacific Giant Octopus ("E. dofleini"), the Southern Giant Octopus ("Enteroctopus magnificus"), "E. megalocyathus", and "E. zealandicus".
Overview.
The only member of this genus that deserves the common name "Giant octopus" is "Enteroctopus dofleini". This holds the record of being the world's largest octopus: direct measurements were made of a live 71 kg (156.5 lb) individual. This octopus had a total length near to 4 m (13 ft). 
The remaining members of the genus are much smaller. "E. megalocyathus" has an average weight of 4 kg and a total length of 1 m. "E. magnificus" has a total length of around 1.5 m.