Styloperla, Wu, 1935

Stark, Bill P. & Sivec, Ignac, 2007, A Synopsis Of Styloperlidae (Insecta, Plecoptera) With Description Of Cerconychia Sapa, A New Stonefly From Vietnam, Illiesia 3 (2), pp. 10-16 : 15

Provisional key to Styloperla males

1. Process of basal cercal segment a low rounded knob on inner margin ......................... S. obtusispina Inner process of basal cercal segment a long, acute spine ..…………………………………………….. 2

2. Process of basal cercal segment without secondary spines; basal cercal segment without laterally directed spur; known from Hainan .... S. flectospina

Process of basal cercal segment with one or more secondary spines; basal cercal segment with a laterally directed spur; known from mainland China.…………………………………………….. 3

3. Apex of cercal process terminating in a pair of small spines giving forked appearance ............... 4

Apex of cercal process terminating in a single spine ....………………………………………......... 5

4. Ventrolateral aspect of cercal process with a secondary pair of subapical spines... S. jiangxiensis

Ventrolateral aspect of cercal process with a single secondary spine near midlength ................... S. inae

5. Lateral spur of basal cercal segment with two or more teeth ....................................................... S. wui

Lateral spur of basal cercal segment a simple, single spine ………………................... S. spinicercia