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The greater blue-ringed octopus (Hapalochlaena lunulata) is one of three (or perhaps four) species of venomous blue-ringed octopuses. This specimen is a Juvenile. The coin put next to it to show size comparison is 1.5 cm in diameter and the body of this Octopus is smaller than that, probably just around 1cm. Despite being a Juvenile, it already has the venom.
Spotted on Mar 29, 2013
Submitted on May 13, 2014
and 6 other people favorited this spotting
Thanks, @sunnyjosef :)