description Gloomy Octopus (Octopus tetricus) Overview
The gloomy octopus, Octopus tetricus, is a benthic octopus found in temperate coastal waters of eastern Australia, with closely related populations around New Zealand treated differently in some taxonomic accounts. It feeds on crustaceans, mollusks, and other small animals and shelters in rocky dens. Aggregations at den sites nicknamed Octopolis and Octlantis have documented repeated signaling, displacement, mating, and conflict, challenging the view that octopuses interact only briefly.
help Gloomy Octopus (Octopus tetricus) FAQ
Why is Octopus tetricus called the gloomy octopus?
The name refers to the animal's dark, sombre appearance rather than an established emotional state. It is also commonly called the common Sydney octopus in eastern Australia.
What does a gloomy octopus eat?
Octopus tetricus preys on animals such as crabs, shellfish, and other bottom-dwelling invertebrates. Discarded shells often accumulate around its den and form conspicuous middens.
Are gloomy octopuses really social?
They are generally considered solitary, but multiple individuals have been observed denning close together at Jervis Bay sites nicknamed Octopolis and Octlantis. Researchers have documented interactions there, including displays, mating, fighting, and the throwing of shells or sediment.
Does Octopus tetricus also live around New Zealand?
Closely related gloomy octopuses occur around New Zealand, but their classification has been debated. Some taxonomic work treats the New Zealand population as a separate species, Octopus gibbsi, rather than Octopus tetricus.
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