Small, pygmy octopus. Body oval-shaped with pointed rear tip. Resting colour typically orange-brown, may also match purple or pink coralline algae. Alarm pattern of black rings on upper surface of mantle. Male with swollen club tip on the end of third right arm, from which species gets its common name. Mantle length to 4 cm, total length to 13 cm.
Very little is known about the biology and behaviour of this small octopus. Its small size allows it to remain hidden in the holdfasts of seaweeds and within crevices in rocky reefs and rubble. Females produce numerous small eggs, which hatch into planktonic young. This species has only been observed in the wild a couple of times.
Rocky reefs and rubble areas, from intertidal pools to a depth of at least 144 m.
New Zealand and south-eastern Australia.
Potential to bite, especially if handled. Venom status unknown.
Native to Australia
- DSE Advisory List : Not listed
- EPBC Act 1999 : Not listed
- IUCN Red List : Not listed