Blue-ringed octopuses, comprising the genus Hapalochlaena, are four highly venomous species of octopus that are found in tide pools and coral reefs in the Pacific and Indian oceans, from Japan to Australia.
Scientific name: Hapalochlaena
Venom type: tetrodotoxin
Family: Octopodidae
Kingdom: Animalia
Order: Octopoda
Phylum: Mollusca