Abstract / Introduction / Summary:
![](https://journal.kagoshima-nature.org/archives/NK_049/1bb8e335baffc694fc26a9df591480c5-300x237.jpg)
A rare porcellanid crab, Polyonyx pilosibrachium Osawa, Naruse and Ng, 2018, is reported on the basis of a specimen collected from Amami-Oshima Island, central Ryukyu Islands, southwestern Japan. This record extends the geographical range of the species to the north, from Kume-jima Island to Amami-Oshima Island. The present specimen was associated with a tube-dwelling Chaetopterus worm as reported in previous studies.