What Crab is this?

[the_cat_keeper]

Saw this crab during a night dive at Sabang wreck, Puerta Galera, Philippines recently. The crab's body is no more than 1", and buries itself under the sand. If one looks carefully, these crabs are all over the place. What type of crab is this?

Thanks.

 

[Wolverine]

Think it belongs to the Elbow Crab family...

 

[LeslieH]

There's a picture of something similar in Gosliner, Behrens & Williams which is listed just as portunid crab.