Holotypes, paratypes, and specimens newly collected from the type localities (i.e., topotypes) of Burmoniscus aokii (Nunomura, 1986), B. boninensis (Nunomura, 1986), B. daitoensis (Nunomura, 1986), B. hachijoensis Nunomura, 2007, B. japonicus (Nunomura, 1986), B. kagoshimaensis Nunomura, 2003, B. murotoensis (Nunomura, 1986), B. okinawaensis (Nunomura, 1986), B. shibatai (Nunomura, 1986), B. tanabensis Nunomura, 2003, and B. watanabei (Nunomura, 1986) were examined in order to clarify their taxonomic status. Observation of 13 morphological characters that were purposed to show species-level diagnostic variations in the original descriptions suggests that all eleven nominal species are identical, and molecular analysis based on three gene fragments supports this suggestion. Additionally, the morphology of the carpus of pereopod 1 and of the endo- and exopodites of pleopod 1 of these species are consistent with those of B. kathmandius (Schmalfuss, 1983). The eleven above-mentioned species of Burmoniscus described from Japan are therefore relegated to junior synonyms of B. kathmandius, originally reported from Nepal.
