Uncommon in the Solitary Islands Marine Park. Distributed throughout the Western Pacific, Indonesia and Japan. In Australia members of the genus are known from all states excepting South Australia.
Often found in association with giant anemones, or on rubble substrate in algae.
As with other decorator crabs, this species has the ability to attach particles for camouflage.
Coral Reef Animals of the Indo-Pacific, Terrence M. Gosliner, David W. Behrens and Gary C. Williams, Sea Challengers Publication, Monterey, California. 1996. p.231.
Atlas of Living Australia website at https://bie.ala.org.au//search?q=achaeus+japonicus. Accessed 12/11/2018.