Calcinus anani is typically found rather deep on the seaward reef. The first two photos show an individual that was under a rock at about 20m depth.
The next one was clinging to a steep wall in about 50m. The juvenile Septa rubecula shell it occupied measured around 15-20mm.
Thanks to Eiji Myorin for the correct ID.
Created 10 August 2018
Updated 2 March 2020