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.
Malacostraca is the largest of the six classes of crustaceans, containing over 25,000 extant species, divided among 16 orders. Its members display a greater diversity of body forms than any other class of animals, and include crabs, lobsters, shrimp, krill, woodlice, scuds (Amphipoda), mantis shrimp and many other less familiar animals. They are abundant in all marine environments and have also colonised freshwater and terrestrial habitats. They are united by a common Bauplan, comprising 20 body segments (rarely 21), divided into a head, thorax and abdomen.
This page is best viewed in an up-to-date web browser with style sheets (CSS) enabled. While you will be able to view the content of this page in your current browser, you will not be able to get the full visual experience. Please consider upgrading your browser software or enabling style sheets (CSS) if you are able to do so.