Blue mouthparts and blue spots. Under rock.
This Thickclaw Porcelain Crab has enormous pincers, although it's a very tiny little fellow!
Porcelain crabs are decapod crustaceans in the widespread family Porcellanidae, which superficially resemble true crabs. They are typically less than 15 mm (0.6 in) wide, and have flattened bodies as an adaptation for living in rock crevices. They are delicate, readily losing limbs when attacked, and use their large claws for maintaining territories.