Crabs, shrimp and krill and their relatives form a very large class that contains two thirds of the world's crustaceans. This includes all the prawns, lobsters and crayfish that people eat. However, they aren't all marine creatures. Some members, such as the woodlice and land crabs, live on land for all or part of their life.
Scientific name: Malacostraca
The Crabs, shrimp and krill can be found in a number of locations including: Great Barrier Reef. Find out more about these places and what else lives there.