-Blue-ringed octopus- is 12 to 20 cm to 8 inches), but its venom is powerful enough to kill humans. There is no blue-ringed octopus antivenom available. The octopus produces venom that contains tetrodotoxin, hyaluronidase,.
This tiny octopus produces a venom times more toxic than cyanide. One single octopus produces enough to kill 26 adult humans. It flashes iridescent blue rings as warning when it is agitated.They're found in Australia.
Octopus vulgaris (Cuvier, en: Common octopus fi: Meritursas it: Polpo comune / Piovra Kingdom Animalia / Phylum Mollusca / Class Cephalopoda / Order Octopoda / Family Octopodidae Aquarium in Messina, Sicily, Italy.