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¹ Marine Hill Laboratory, ICAR-Central Island Agricultural Research Institute, P.B. No. 181, Garacharma, Port Blair-744101, Andaman & Nicobar Islands, India DOI : 10.4194/1303-2712-v17_1_23 Viewed : 3985 - Downloaded : 3289 Since Burton & Davie revised the monotypic genus Thenus, the genus is represented by two species in Mainland India, Thenus unimaculatus (Burton and Davie, 2007) and Thenus indicus (Lund, 1793). In this study, we are reporting the occurrence of T. unimaculatus for the first time from Andaman and Nicobar Islands. We have investigated the species based on morphological characters and morphometric ratios following original description of T. unimaculatus. All the morphological characters and most of the morphometric ratios were found to coincide with the previous description. Mitochondrial COI gene sequencing also supports the landings of T. unimaculatus in these Islands. Keywords : Morphology, ratios, lobster, mtDNA, COI gene