Two new species of the freshwater-crab genus Demanietta Bott, 1966 (Decapoda: Brachyura: Potamidae) from southern Myanmar

Abstract

We describe two new species of the freshwater-crab genus Demanietta Bott, 1966 from Tanintharyi (Tenasserim) division, southern Myanmar (Burma), Demanietta liui sp. nov. and Demanietta lenya sp. nov. Demanietta liui sp. nov. is morphologically most similar to D. thagatensis Rathbun, 1904 and D. khirikhan Yeo, Naiyanetr & Ng, 1999; D. lenya sp. nov. appears close to D. manii Rathbun, 1904, D. merguensis Bott, 1966, and D. nakhonsi Yeo, Naiyanetr & Ng, 1999. The two new species are easily distinguished from their most similar congeners in the shape of the external orbital tooth, epibranchial tooth, and male first gonopod. Molecular analysis based on partial mitochondrial 16S rDNA also supports the systematic position of the new taxa.