Jero - found a paper for you which puts the crab into the genus Fizesereneia. I can't tell if it's one of the species mentioned in the paper but the black concavities are typical of the genus.
http://rmbr.nus.edu.sg/rbz/biblio/42/42rbz521-538.pdf
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Cheers, Leslie
So many worms, so little time...
Natural History Museum of Los Angeles County
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