Greater blue-ringed octopus

Hapalochlaena lunulata

The greater blue-ringed octopus is one of four species of venomous blue-ringed octopuses belonging to the octopodidae family.
Greater blue-ringed octopus - Hapalochlaena lunulata Kareko Batu, Lembeh.
Our first encounter with this beautiful but super-deadly tiny octopus!
At first it was not even displaying the blue rings so it is kind of scary to think we could have brushed him by mistake
https://www.jungledragon.com/image/71962/greater_blue-ringed_octopus_-_hapalochlaena_lunulata.html
https://www.jungledragon.com/image/71963/greater_blue-ringed_octopus_-_hapalochlaena_lunulata.html
https://www.jungledragon.com/image/71964/greater_blue-ringed_octopus_-_hapalochlaena_lunulata.html Geotagged,Greater blue-ringed octopus,Hapalochlaena lunulata,Indonesia,Spring

Appearance

The greater blue-ringed octopus is, despite its vernacular name, a small octopus whose size does not exceed 10 centimeters, arms included, for an average weight of 80 grams.
Its common name comes from the relatively large size of its blue ring , so they are indeed larger than those of the other members of the genus and help to distinguish them.
The head is slightly flattened dorsoventrally and finished in a tip. Its height arms are short.


The coloration of this octopus varies with the circumstances and the ambient environment from yellow ocher to light brown through whitish . The blue rings are about 60, spread throughout the entire animal's coat.
The rings are roughly circular and are based on a darker blotch than the background color of the coat. A black line, whose thickness can vary to increase the contrast and be more visible, borders the electric blue circles. The blue rings are an aposematic adornment whose purpose is to clearly show to all potential predators that this octopus is highly poisonous. They also have characteristic blue lines running through their eyes.
Greater blue-ringed octopus - Hapalochlaena lunulata Kareko Batu, Lembeh.
here getting brownish.. Geotagged,Greater blue-ringed octopus,Hapalochlaena lunulata,Indonesia,Spring

Distribution

The greater blue-ringed octopus is widespread throughout the tropical and subtropical waters of the Indo-West Pacific from Sri Lanka to the Philippines and from Australia to south Japan.

The greater blue-ringed octopus likes shallow waters with mixed seabed . Like all octopuses, it lives in a burrow and only comes out to search for food or a mate. The entrance of the shelter is littered with legs from meals and it's quite easily identifiable.
Greater blue-ringed octopus - Hapalochlaena lunulata Kareko Batu, Lembeh.
Last pic of the selected series. Size does not exceed 10 cm, so you can imagine how tiny it is! Geotagged,Greater blue-ringed octopus,Hapalochlaena lunulata,Indonesia,Spring

Behavior

The greater blue-ringed octopus is a benthic animal which has a solitary way of life. The breeding season varies according to geographical area, the female lays 60 to 100 eggs which are kept under the female's arms during the incubation period, which lasts about a month.
Newborns have a brief planktonic development passage before settling on the seabed.

This small octopus is an active carnivore that feeds mainly on crustaceans, bivalve shells and occasionally small fish.
Greater blue-ringed octopus - Hapalochlaena lunulata Kareko Batu, Lembeh.
This is the same octopus changing colors as we follow him and displaying its warning blue rings! Greater blue-ringed octopus,Hapalochlaena lunulata

Habitat

The greater blue-ringed octopus is widespread throughout the tropical and subtropical waters of the Indo-West Pacific from Sri Lanka to the Philippines and from Australia to south Japan.

The greater blue-ringed octopus likes shallow waters with mixed seabed . Like all octopuses, it lives in a burrow and only comes out to search for food or a mate. The entrance of the shelter is littered with legs from meals and it's quite easily identifiable.

References:

Some text fragments are auto parsed from Wikipedia.

Taxonomy
KingdomAnimalia
DivisionMollusca
ClassCephalopoda
OrderOctopoda
FamilyOctopodidae
GenusHapalochlaena
SpeciesH. lunulata