The Japanese mirror crab is a species of crab found primarily in the waters around Japan. It is known for its distinctive, shiny, and flat shell that resembles a mirror, which helps it blend into its surroundings. This crab typically inhabits sandy or muddy substrates and is often found at depths of up to 200 meters. These crabs are part of the family Xanthidae and are characterized by their unique body shape and coloration. They are primarily nocturnal, feeding on small invertebrates and detritus. The Japanese mirror crab plays a role in the marine ecosystem by contributing to the breakdown of organic materials.