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

Published as part of Mikhaljova, Elena V., 2021, Review of the millipede genus Levizonus Attems, 1898, with description of a new species from the Far East of Russia (Diplopoda, Polydesmida, Xystodesmidae), pp. 159-184 in European Journal of Taxonomy 751 on page 178, DOI: 10.5852/ejt.2021.751.1387, http://zenodo.org/record/4923494