About Charybdis japonica (A.Milne-Edwards, 1861)
Charybdis japonica, commonly known as the Asian paddle crab, is a species of swimming crab that belongs to the family Portunidae. This crab has a hexagonal, concave carapace that measures around 12 centimetres (4.7 inches) wide, and the entire body ranges in colour from pale green to olive green. It is naturally found in the waters surrounding Japan, Korea, and Malaysia, but has become an invasive species in New Zealand. It has also been recorded as an alien species in the Adriatic Sea and in waters off Australia.