Key to species of Teinoptila from China based on male genitalia

1. Socius with one spine at apex, sacculus with U-shaped mesal concavity (Fig. 6) ...................................... T. bolidias

- Socius with two spines at apex, sacculus without U-shaped mesal concavity ........................................................... 2

2. Saccus roundly dilated distally (Fig. 8 a) ................................................................................................. T. antistatica

- Saccus slightly but not roundly dilated distally .......................................................................................................... 3

3. Sacculus triangular, smooth at apex ............................................................................................................................ 4

- Sacculus clavate, with small spines in distal 1/3 (Fig. 10) .............................................................. T. clavata sp. nov.

4. Gnathal arm with a pair of triangular processes (Gershenson & Ulenberg, 1998: 97) ......................... T. brunnescens

- Gnathal arm with a pair of fingerlike processes (Moriuti, 1977: 206) ......................................................... T. guttella