Calappoidea; Box and Moon Crabs

The 2 commonest of the Calappoidea crabs live on the sand outside Koh Phangan dive sites. They can quickly burrow down into it, leaving just their eyes exposed. Then they will wait there, looking out for passing prey!

With chunky bodies that must be hard for predators to get at when everything is retracted.

Usually buried just below the sand, waiting for something edible to pass by!