Red-spotted box crab

''Calappa calappa'', also known as the smooth or red-spotted box crab, is a tropical marine species of crab with an Indo-Pacific distribution, and showing great variability in its patterning and colouration. First described as ''Cancer calappa'' by Linnaeus in 1758 from a specimen originating from Ambon Island, and later in 1781 as ''Cancer fornicatus'' by Fabricius, it was finally placed in the genus ''Calappa'' by Lancelot Alexander Borradaile in 1903. The name ''calappa'' is associated with ''kelapa'', the Malay word for 'coconut'.