Carcinus maenas is a common littoral crab, and an important invasive species. It is listed among the 100 "world's worst invasive types of invasive species". C. maenas is known by different names around the world. In the British Isles, it is generally referred to simply as the shore crab. In North America and South Africa, it bears the name green crab or European green crab. In Australia and New Zealand, it is referred to as either the European green crab or European shore crab.