Mantle length is cm. This species is extremely venomous, tetrodotoxin venom produced in the salivary glands has potential to cause human deaths (Ref. Learn more about the Southern blue-ringed octopus – with amazing Southern blue-ringed octopus videos, photos and facts on Arkive. Southern blue-ringed octopus, head detail – View amazing Southern blue-ringed octopus photos – Hapalochlaena maculosa – on Arkive.
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Southern blue-ringed octopus
Found most commonly in the tidal rock pools along the southern coast of Australia. Most commonly found in rocky, shallow pools of water or in shallow corals. Also found under rocks in sandy or muddy uapalochlaena of bottom where alga is plentiful.
Particularly common after storms when it can be found looking for crabs and bivalves. MoynihanCampbellAustralian wildlife lecturesRogersonPark The blue-ringed octopus is a small octopus that ranges in size from 4 mm at birth to up to 20 cm in adulthood.
The most outstanding characteristic of this species is the iridescent blue rings in the eye spots. These rings are reported to “glow” when an individual is aggravated.
The female will initiate reproduction by specific coloring and posturing. The male will then approach her to begin courtship. Courtship consists of “love play” Wood, and caressing. The male will then use the hectocotylus, a modified arm consisting of a groove between the hapalochlarna and ending in a spoonlike tip, to deposit the sperm in the female’s oviduct, which is located under the mantle.
Shortly thereafter, the female will begin to lay her eggs and the brooding period will begin.
Characteristic brooding of this species is for the female to carry the eggs in its arms. She will guard them for a period of fifty days, at which point they will hatch into planktonic “paralarva”. Initially at birth, the octopus will be only 4 mm long. This stage of the life cycle, the young will float to the top and join the plankton for about a month.
At the end of this time period they will once again return to the bottom to resume their normal life. Hanlon and Messenger The blue ringed octopus is a nonaggressive octopus and in general exhibits the typical behaviors of octopuses: Burrowing is where an octopus establishes a den or refuge for itself by excavation of sand, mud, gravel, and coral rubble. This can often pose a problem in an aquarium environment, where underground filters are common.
ADW: Hapalochlaena maculosa: INFORMATION
Aposematism, or advertising toxicity, in this species includes the “glowing” Campbell of the iridescent blue rings, and often a yellow and black striping of the body. In general, hapalochlaeja much is known of use of these displays in this particular species.
At one week of age, the blue ringed octopus will begin to eat crab pieces. As the octopus matures, it will begin to eat live crabs and bivalve mollusks. The octopus will either entice its prey into its vicinity and inject a poison into the water that will paralyze it or will inject the poison into its prey directly.
It is also believed that the octopus will capture prey, forming an airtight pouch around it, and inserting the poison into the pouch, cause the prey to take the poison in through its respiratory system. The poison is a neurotoxin which causes paralysis, which is particularly fatal if the poison affects either the heart or repiratory system. To date there is no antitoxin. Generally though, humans are not considered prey to this creature and a bite from one seems to be more of a defensive response than anything else.
Loadsman and Thompson This species lacks an ink sac and therefore has become a common addition to the marine aquarium. This is much to the dismay of many toxicologists who feel that people selling and buying them are uninformed of the true danger they pose.
This species also is used for its venom.
One of Australia’s major industries is its venom industry, in which the blue-ringed octopus plays msculosa valuable role. This species is considered one of the most dangerous animals in the sea because of the toxicity of its venom.
In addition, the bite of the blue-ringed octopus is not painful. Therefore, there have been reported cases where people handled one and did not realize they had been bitten until the symptons of envenomation began to occur.
There was no information on conservation efforts made for the blue-ringed octopus. A problem has begun to arise surrounding the publicity of the toxicity of its venom.
People have begun to over-react and kill octopuses encountered in shallow tidal pools. Though the blue ringed octopus carries a toxin which can kill humans, there has never yet been a report of an octopus attacking a human. In general this species is nonaggressive and will only bite if picked up or stepped on.
The name Blue-ringed Octopus is actually given to a large group consisting of about five different species. Two of these are Hapalochlaena lunulata and Hapalochlaena fasciata. Animals with bilateral symmetry have dorsal and ventral sides, as well as anterior and posterior ends. Synapomorphy of the Bilateria. Microsoft Encarta 98 Encyclopediacomputer version ‘ Australian Wildlife Lectures, Cephalopod Life Cycles v. Harcourt Brace Jovanovich Press. Communication and Noncommunication by Cephalopods.
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Sea World Inc Rogerson Biogeographic Regions australian native indian ocean native pacific ocean native Habitat Most commonly found in rocky, shallow pools of water or in shallow corals. MoynihanCampbellAustralian wildlife lecturesRogersonPark Aquatic Biomes coastal Physical Description The blue-ringed octopus is a small octopus that ranges in size from 4 mm at birth to up to 20 cm in adulthood. Hanlon and Messenger Other Physical Features ectothermic bilateral symmetry Average mass 26 g 0.
Hanlon and Messenger Behavior The blue ringed octopus is a nonaggressive octopus and in general exhibits the typical behaviors of octopuses: Anachoresis is living in crevices and holes.
Hanlon and MessengerCampbellWood Food Habits At one week of age, the blue ringed octopus will begin to eat crab pieces. Economic Importance for Humans: Positive This species lacks an ink sac and therefore has become a common addition to the marine aquarium. Hapalochlaenx addition this species has come under study to provide information on the mantle and the microscopic protrusions on the mantle of cephalopods.
Wood Economic Hapalochoaena for Humans: Negative This species is considered one of the most dangerous animals in the sea because of the toxicity of its venom.
Description & Behavior
Australian Wildlife LecturesSeaworldPark Conservation Status There was no information on conservation efforts made for the blue-ringed octopus.
Pacific Ocean body of water between the southern ocean above 60 degrees south latitudeAustralia, Asia, and the western hemisphere. Connect with us Help us improve the site by taking our survey.
Classification Kingdom Animalia animals Animalia: The ADW Team gratefully acknowledges their support.