Goniagnathus Fieber

Key to subgenera and species of Chinese Goniagnathus Fieber View in CoL (males)

1. Pygofer side without appendage. Fused subgenital plates and valve elongate...................... G View in CoL . ( Epitephra) rugulosus

- Pygofer side with or without appendage. Fused subgenital plates and valve short...................................................... 2

2. Pygofer side without appendage. Style apophysis with apex strongly oblique, subapical lobe well-developed. .......................................................................................................................................................... G View in CoL . ( Goniagnathus) brevis

- Pygofer side with dorsocaudal appendage present. Style apophysis with apex not strongly oblique, subapical lobe moderate to weakly developed. G. ( Tropicognathus).................................................................................................... 3

3. Style apophysis expanded apically ( Fig. 1 View FIGURE 1 C)................................................................................................................ 4

- Style apophysis similar in width throughout length. .................................................................................................... 5

4. Pygofer side constricted at mid-length and broadened caudally. Aedeagal shaft strongly curved caudodorsad and in apical 0.25 strongly curved anteriorly, not bifid apically............................................................................. G. nervosus View in CoL

- Pygofer side with caudal lobe rounded ( Fig. 1 View FIGURE 1 A). Aedeagal shaft arcuate, bifid apically ( Figs 1 View FIGURE 1 D, 1E). .......................................................................................................................................................................... G View in CoL . viraktamathi sp. n.

5. Pygofer side appendage elongate. Aedeagal shaft in lateral view with pair of apical linear processes. ...................... 6

- Pygofer side appendage robust. Aedeagal shaft in lateral view with pair of apical triangular processes.... G. cornutus View in CoL

6. Lower aedeagal processes situated at midlength of shaft............................................................................ G. punctifer View in CoL

- Lower aedeagal processes situated slightly basad of midlength of shaft.................................................... G. taiwanus View in CoL