A new species, Dayrat & Goulding, , is described, bringing the total to four known species in the genus Buchannan, 1800. is a rare species with only nine individuals found at three mangrove sites in the Andaman Islands and the Strait of Malacca (western Peninsular Malaysia and eastern Sumatra). The new species is delineated based on mitochondrial (COI and 16S) and nuclear (ITS2 and 28S) DNA sequences as well as comparative anatomy. Each species is characterized by a distinct color and can easily be identified in the field, even in the Strait of Malacca where there are three sympatric species. An identification key is provided. In addition, (Westerlund, 1883) is recorded for the first time from eastern Sumatra, and Tapparone-Canefri, 1889, of which the type material is described and illustrated here, is regarded as a new junior synonym of .
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