Mauve Eyed Hermit Crab (Dardanus Crassimanus) イシダタミヤドカリ
I had a tough time finding the English name for the Mauve Eyed Hermit Crab, so it may not be very well known. They are found around Australia and the Western Pacific. Enoshima
This is the same Mauve Eyed Hermit Crab at Enoshima. It is a marine hermit crab and is underwater.