The Blue-Ringed Octopus isn't just one species of Octopus, it is actually three fairly different main species of Octopus that live in and around the Indian and Pacific Oceans.
Kingdom: Animalia
Phylum: Mollusca Class: Cephalopoda
Order: Octopoda
Family: Octopodidae
Genus: Hapalochlaena
Species: (various species)
Because of the differentiating species, the Blue-Ringed Octopus doesn't have an actual scientific name, but it does have a Genus; Hapalochaena. (hapa)-(loo)-(cha)-(leena)