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Hermit crab, with a flat and rather wide posterior, brilliant coloring. Found in a tide pool at Gili Island of Lombok in Indonesia during a low tide. Pictures taken without removing the species from water to allow it to come out.
White sandy beach on a tropical island in Eastern Indonesia.
The Wallace strait divided Bali and Lombok create very different species of animals.
Beautiful hermit crab! I am not sure this is Clibanarius vittatus, though. Your crab has no stripes on the legs but, instead has white dots and blue "knees" (so to speak). The thin stripe hermit crab does not have those features.
Here is a picture of a C. vittatus where you can clearly see the legs:
http://www.touchthesea.org/hermitcrablv2...
Please check the link I provided above. I am pretty sure that you have a Blue-knee Hermit Crab, Dardanus guttatus.
I moved this to the Arthropods section for you.