Dayus serratus Yu & Yang 2013

Length, male 3.9mm. General color yellowish. Male ventral abdominal apodemes reaching segment 3 (Fig. 25). Male pygofer (Fig. 24) with dorsoposterior margin concave, tapering caudally; ventral appendage with dorsal margin slightly sinuate, tapered to acute apex. Subgenital plate slightly broader basally, with 9 apically rounded lateral macrosetae in basal group, an oblique line of 12 macrosetae and several long fine setae sub-basally to apex and ca.32 short microsetae at outer margin (Fig. 27). Parameres as in Fig. 28. Aedeagus shaft long, basal half strongly dorsoventrally depressed, distal half narrow and cylindrical, serrate laterally at base on dorsal surface; with two long processes arising at midlength on each side of shaft, basally each process with a lateral lamellate serrate lobe (Figs 29, 30). Anal tube process short (Fig. 24).