Parthenogenetic female short description. Body fusiform, high (Fig. 14 B); head and valves without keel. Valves oblique. Posteroventral angle of valves without denticles. Rostrum short. Three main head pores with wide connection between them; lateral head pores with small rounded cavities (cosmaria) under them (Fig. 14 C). Labral keel of moderate width, with a rounded apex, without clusters of setulae on posterior margin.

Postabdomen short and wide (Fig. 14 D), with characteristic square postanal portion. Preanal angle well defined, postanal angle defined. Postanal denticles very short. Postanal lateral groups of setulae with middle setulae being longest; all setulae are of equal thicknes. Postabdominal claw short, curved, with long basal spine.

Antennule with single lateral aesthetasc, this and one of the terminal aesthetascs is much longer than others. Antennal seta without a basal peg. Antenna without seta on basal segment of endopodite. Spine on basal segment of exopodite longer than middle segment. Spines on apical segments longer than apical segments. IDL of limb I with three setae (Fig. 13 E); seta 1 large, moderately thick, hook-like; setae 2–3 thin, armed with thin setulae.

Single species, Nicsmirnovius eximius (Kiser, 1948) (Fig. 14 B–Е). Length of adult 0.34–0.42 mm. Reophilous bottom-dwelling species, found in both coastal zone of large rivers and in small forest streams. Distributed in East China and South-East Asia. For a detailed description see Kotov & Sanoamuang (2004).