Key to known Valiatrella species (males)

1. The lobes of male supra-anal plate separated from each other conspicuously at base; body dorsum colored brown or dark brown............................................................................................... 2

- Lobes of male supra-anal plate separated from each other inconspicuously; body dorsum colored yellow or light brown.... 5

2. The lobes of male anal plate laminate-shaped and well separated from each other; ectophallus apodeme thin..................................................................................... Valiatrella laminaria Liu & Shi, 2007

- Lobes mentioned above cone-shaped and near to each other; ectophallus apodeme stout.............................. 3

3. Horizontal lateral lobe of epiphallus distinctly longer and curved and extending to the lower part of vertical lateral lobe.... 4

- Horizontal lobe short and its apex far from the other lobe............................. Valiatrella persicifolius sp. nov.

4. Body dorsum dark brown; the lobes of male anal plate long....................... Valiatrella pulchra (Gorochov, 1985)

- Body dorsum brown; the lobes of male anal plate short........................... Valiatrella sororia (Gorochov, 2002)

5. Epiphallus lateral lobes almost straight and parallel to each other................. Valiatrella bimaculata (Chopard, 1928)

- Epiphallus lateral lobes bended and directed towards the middle.............. Valiatrella multiprotubera Liu & Shi, 2007