Camposcia retusa

Camposcia retusa, known commonly as the velcro crab, spider decorator crab, or harlequin crab, is a species of marine crustacea in the family Inachidae. It is known for attaching living sponges and corals to itself, which camouflage it.

The velcro crab is widespread throughout the tropical waters of the Indo-West Pacific area, including the Red Sea.

Description
This crab has a shell size of 3 cm and with the legs it can reach 10 cm.