Abstract / Introduction / Summary:
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.
