Key to the species of Levizonus

1. Metatergal surface with low bosses either everywhere (Fig. 1A–B) or only laterally. Gonopods as in Fig. 2A–D …………………………………………………………… L. circularis Takakuwa, 1942

– Metatergal surface smooth, without any bosses.Gonopods different…………………………………2

2. Apex of gonopod telopodite like two plates placed perpendicular to each other (Fig. 6A–B) ……………………………………………………… L. malewitschi Lokschina & Golovatch, 1977

– Apex of gonopod telopodite not like two plates placed perpendicular to each other ………3

3. SL with a large long H basally (Fig. 4B–D)…………………… L. distinctus Mikhaljova, 1990

– SL without a large long H basally ………………………………………………………………4

4. Telopodite apex trifurcate ………………………………………… L. takakuwai (Verhoeff, 1941)

– Telopodite apex not trifurcate ……………………………………………………………………5

5. SL massive, dentiform. (Fig. 5B–D) …………………………… L. laqueatus Mikhaljova, 1981

– SL not massive, not dentiform ……………………………………………………………………6

6. Apical edge of telopodite without numerous small outgrowths …… L. montanus (Takakuwa, 1941)

– Apical edge of telopodite with one to numerous small outgrowths, seldom smooth ………………7

7. Telopodite subapically with lateral large knee-shaped protrusion (K) (Fig. 8C). Telopodite apex narrower (Fig. 8D) …………………………………………… L. nakhodka Mikhaljova sp. nov.

– Telopodite subapically with lateral small rounded protrusion (K1) (Fig. 10A–D). Telopodite apex broader (Fig. 11A) …………………………………………………… L. thaumasius Attems, 1898