A new species of Dolerocypris (Crustacea, Ostracoda) from Thailand, with notes on the taxonomic position of D. marina Hartmann, 1965

Dolerocypris rossettii sp. nov . is described from northeastern Thailand. It differs from all members of the genus by carapace overlap, in which the right valve overlaps the left valve anteriorly but vice versa posteriorly. In addition, D. rossettii sp. nov . can be distinguished from its congeners by a four-segmented aesthetasc Y on the second antenna (A2), a longer seta on the A2 exopodite, a γ seta on the mandibular palp with a long needle-like tip, a short e seta on the second thoracopod, and a shorter Sa and longer Sp setae on the caudal ramus. The new species is the second Dolerocypris Kaufmann, 1900 described from Thailand. The Oriental region is the most speciose for Dolerocypris . The generic position of D. marina is discussed based on morphological comparisons with Dolerocypris , Tanycypris , Triebel, 1959, and Nealecypris Savatenalinton & Martens, 2009 species. This suggests that D. marina should be transferred to Nealecypris and, as a result Nealecypris marina comb. nov ., is proposed. An identification key to species of the genus Dolerocypris is also provided.