Genus Maja, commonly known as spider crabs, is a group of crustaceans that can be found in oceans worldwide. These fascinating creatures are characterized by their long legs and spiky bodies, which help them blend in with their surroundings and avoid predators. While Genus Maja is the scientific name for these crabs, there are several other terms used to describe them, including spider crab, crab spider, and sea spider. Some of the other common names for species within the Genus Maja include the giant spider crab, red-spotted crab, decorator crab, and arrow crab. Regardless of what you call them, these unique creatures are a fascinating part of the marine ecosystem.