![National Aquarium on Twitter: "The greater blue-ringed octopus is only about 4 inches across, but it holds enough venom to kill as many as 26 people... within minutes. Look, but definitely don't National Aquarium on Twitter: "The greater blue-ringed octopus is only about 4 inches across, but it holds enough venom to kill as many as 26 people... within minutes. Look, but definitely don't](https://pbs.twimg.com/media/EGYVMRRWwAAyUgf.jpg:large)
National Aquarium on Twitter: "The greater blue-ringed octopus is only about 4 inches across, but it holds enough venom to kill as many as 26 people... within minutes. Look, but definitely don't
![Greater blue-ringed octopus, Hapalochlaena lunulata is one of four species of highly venomous blue-ringed octopuses belonging to the family Octopodida Stock Photo - Alamy Greater blue-ringed octopus, Hapalochlaena lunulata is one of four species of highly venomous blue-ringed octopuses belonging to the family Octopodida Stock Photo - Alamy](https://c8.alamy.com/comp/2AHMFRJ/greater-blue-ringed-octopus-hapalochlaena-lunulata-is-one-of-four-species-of-highly-venomous-blue-ringed-octopuses-belonging-to-the-family-octopodida-2AHMFRJ.jpg)
Greater blue-ringed octopus, Hapalochlaena lunulata is one of four species of highly venomous blue-ringed octopuses belonging to the family Octopodida Stock Photo - Alamy
![Genome‐wide comparisons reveal a clinal species pattern within a holobenthic octopod—the Australian Southern blue‐ringed octopus, Hapalochlaena maculosa (Cephalopoda: Octopodidae) - Morse - 2018 - Ecology and Evolution - Wiley Online Library Genome‐wide comparisons reveal a clinal species pattern within a holobenthic octopod—the Australian Southern blue‐ringed octopus, Hapalochlaena maculosa (Cephalopoda: Octopodidae) - Morse - 2018 - Ecology and Evolution - Wiley Online Library](https://onlinelibrary.wiley.com/cms/asset/3de20a48-29e4-4b19-9c1e-2b434e8ceb27/ece33845-fig-0001-m.jpg)
Genome‐wide comparisons reveal a clinal species pattern within a holobenthic octopod—the Australian Southern blue‐ringed octopus, Hapalochlaena maculosa (Cephalopoda: Octopodidae) - Morse - 2018 - Ecology and Evolution - Wiley Online Library
![Greater blue-ringed octopus | Churaumi Fish Encyclopedia | Okinawa Churaumi Aquarium - For the next generation to inherit; the beautiful seas of Okinawa. - Greater blue-ringed octopus | Churaumi Fish Encyclopedia | Okinawa Churaumi Aquarium - For the next generation to inherit; the beautiful seas of Okinawa. -](https://churaumi.okinawa/userfiles/fish_images/sanngo_musekitsui/oomarumonndako4.jpg)