Key to species of Mixodusa Stolyarov

1 Male cerci with long inner tooth, much longer than apical conical part (Ünal 2012: Fig. 14). Female 7th sternite separated from subgenital plate, with an acute and high projection in the middle (Ünal, 2012: Fig. 16)........... M. siazovi (Uvarov, 1929)

- Male cerci with short inner tooth, shorter than apical conical part (Ünal 2012: Fig. 14). Female 7th sternite fused with subgenital plate, without or with a very low carina (Figs. 206, 212, 317)................................................ 2

2 Pronotum with strongly and narrowly rounded posterior margin (Figs. 208, 211). Male last tergite with long, triangular lobes pointed at apex; its posterior incision deep and triangular (Figs. 209). Female 7th sternite with a low longitudinal carina in the middle (Fig. 212).............................................................. M. bocquilloni (Uvarov, 1917)

- Pronotum with broably rounded posterior margin, more truncate (Figs. 200, 205). Male last tergite with short and rounded lobes; its posterior incision shallower and more rounded (Figs. 201). Female 7th sternite with smooth surface without carina in the middle (Figs. 206, 317)........................................................... M. retusa Ünal, sp. nov.