Box crab

The box crab (Calappa hepatica) is a common benthic crab of tropical and subtropical parts of the Indian and Pacific Oceans and the Red Sea. It is also known as the shame-faced crab or the tortoise crab; all these names refer to the animal's appearance, with its two chelipeds (claw-bearing limbs) being used to shield the "face", giving the crab almost impregnable armour. The carapace is covered in small lumps, and is generally white to golden in colour.