Siamopsis gen. nov. and five new species of the subfamily Cypridopsinae Kaufmann, 1900 (Crustacea: Ostracoda) from Thailand Author Savatenalinton, Sukonthip text European Journal of Taxonomy 2017 2017-12-19 384 1 39 journal article 21906 10.5852/ejt.2017.384 30bb0609-0304-4ded-8c6d-fd05c534537d 2118-9773 3839820 3A46429B-2499-4909-AD9D-E3328E4A667D Key to genera with RV overlapping LV in the subfamily Cypridopsinae 1. CR absent in both male and female ……………………… Martenscypridopsis Karanovic, 2000 – CR present in female ………………………………………………………………………………2 2. CR of cylindrical shape ……………………………………………………………………………3 – CR of triangular shape ……………………………………………………………………………5 3. RV with well developed septa beneath posterior inner list ………… Klieopsis Martens et al. , 1991 – RV without well developed septa beneath posterior inner list ……………………………………4 4. Internal LV with a plate-like protrusion on the postero-dorsal part, two t-setae on female A2 …… ………………………………………………………………………………… Siamopsis gen. nov. – Internal LV without a plate-like protrusion on the postero-dorsal part, four t-setae on female A2 … ……………………………………………………………………… Plesiocypridopsis Rome, 1965 5. Valves very elongated (L/H> 2), posterior selvage of internal LV displaced substantially to the front … …………………………………………………………… Tanganyikacypridopsis (Martens, 1985) – Valves not very elongated (L/H <2), posterior selvage of internal LV not displaced substantially to the front …………………………………………………………………………………………6 6. A2 natatory setae long, carapace subtriangular …………………… Sarscypridopsis McKenzie, 1977 – A2 natatory setae short, carapace not subtriangular (mostly more subovate) ………………………7 7. RV without inner list, left prehensile palp with slender finger-like terminal segment, terminal segment of Mx1 palp with (slightly) enlarged tip ……… Thermopsis Külköylüoğlu et al. , 2003 – RV with inner list, left prehensile palp without slender finger-like terminal segment, terminal segment of Mx1 palp without enlarged tip ………………………………………………………8 8. Left prehensile palp with terminal segment enlarged distally, terminal segment of Mx1 palp very elongated (L/W> 2) ………………………………………………………… Bryocypris Røen, 1956 – Left prehensile palp without terminal segment enlarged distally, terminal segment of Mx1 palp not very elongated (L/W <2) ……………………………………… Kapcypridopsis McKenzie, 1977