Family Majidae, commonly known as the spider crab family, includes a wide variety of crabs. These crabs exhibit unique physical features such as an elongated body, long and thin legs, and a rounded carapace. Due to this, they have several synonyms such as "long-legged crabs," "spiny crabs," and "round-backed crabs." Additionally, they are also known as "decorator crabs" due to their ability to camouflage themselves with sponges, algae, and other sea creatures. Some of the common genera under Family Majidae include Maja, Hyas, and Libinia. These crabs are mainly found in cold temperate waters across the world and are important commercial species.