Key for identification of Cladocera of the subfamily Aloninae (Anomopoda: Chydoridae) from South-East Asia Author Sinev, Artem Y. text Zootaxa 2016 4200 4 451 486 journal article 10.11646/zootaxa.4200.4.1 385be9e3-2309-4de5-9bff-80f724cf4892 1175-5326 191528 5DF1767F-71A9-451F-A418-D1D47A853586 Leydigiopsis Sars, 1901 Parthenogenetic female short description. Body high oval ( Fig. 12A ); head and valves without a keel. Valves without sculpture. Posteroventral angle of valves without denticles. Rostrum long, curved. Main head pore as elongated rimmed field, lateral head pores minute. Labral keel of moderate width, with a rounded apex, without clusters of setulae on posterior margin. Postabdomen broad ( Fig. 12B ), with convex postanal margin, convex distal margin and broadly rounded distal angle; length about 2.3–2.6 heights. Preanal angle well-defined; postanal angle weakly defined. Postanal denticles large, numerous; length of distalmost denticles over 2 widths of postabdominal claw base. Postanal lateral groups of setulae of moderate length; in distalmost groups, length of setulae about the width of base of postabdominal claw. Postabdominal claw long, almost straight, with rudimentary basal spine. Antennule with three lateral aesthetascs; all terminal aesthetascs of similar length. Antennal seta arising from well-defined tubercule. Antenna with a spine-like seta on basal segment of endopodite. Spine on basal segment of exopodite about 2/3 length of middle segment. Spines on apical segments of same lenght than apical segments. IDL of limb I with three setae; seta 1 short, seta 2–3 thin, armed with thin setulae. Single species, Leydigiopsis pulchra Van Damme & Sinev, 2013 ( Fig. 13A–B ). Length of adult 0.65–0.75 mm . Inhabit forest peat swamps and humic ponds; bottom-dwelling species. Species is known from South Thailand , Cambodia , South Vietnam and India ( Van Damme & Sinev, 2013 ). For detailed description see Van Damme & Sinev (2013) .