The Tasmanian giant crab, Pseudocarcinus gigas is a very large species of crab that resides in the southern waters of Australia on the edge of the continental shelf at depths of 20-820 metres (66-2,690 ft), but mostly 140-270 metres (460-890 ft). The Tasmanian giant crab is one of the largest crabs in the world, reaching a mass of 13 kilograms (29 lb) and a carapace width of up to 46 centimetres (18 in). It is the only species in the genus Pseudocarcinus. Males reach more than twice the size of females. It has a white shell with claws that are splashed in red. The females' shells change colour when they are producing eggs.