Answer:
The Japanese Spider Crab, 'Macrocheira kaempferi', a Crustacean of the class Malacostraca, is not only the 'World's Largest Crustacean' but it is also the 'Largest Arthropod in the World' in overall size. It weighs up to 20 kg (44 lb), having a body up to 60 cm (2 ft) long and has a leg span of almost 4 m (13 ft).
Category : Crustaceans
Next Question: Which is the 'World's Smallest Crustacean'?
Previous Question: Which Animals are considered to have the 'Greatest Biomass on the Planet'?