Scylla is a genus of swimming crabs, comprising four species, of which S. serrata is the most widespread. They are found across the Indo-West Pacific. The four species are: Image Scientific name Common name Distribution Scylla olivacea (Herbst, 1796) orange mud crab Southeast Asia to Pakistan, and from Japan to northern Australia Scylla paramamosain Estampador, 1949 South China Sea south to the Java Sea Scylla serrata (Forskål, 1775) black crab Southern Japan to south-eastern Australia, northern New Zealand Scylla tranquebarica (Fabricius, 1798) Pakistan and Taiwan to the Malay Archipelago and other Indo-Pacific regions
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