Key to species of Enghoffosoma known to occur in Vietnam

(based on gonopod characters alone)

1 Gonopod postfemoral region consisting only of a solenomere and a process e .................................... 2

- Gonopod postfemoral region consisting of a solenomere and processes e and p .................................... 4

2 Process e small, triangular (Figs. 7–8)................................................... E. triangulare sp. nov.

- Process e large, shaped otherwise....................................................................... 3

3 Process e stout, straight, slightly shorter than solenomere (Figs. 13–14)......................... E. digitatum sp. nov.

- Process e lobe-shaped, curved ventrad, much shorter than solenomere (Figs 4–5)......................... E. fedorenkoi

4 Femorite with an apical shelf b. Process p small, retrorse and tuberculiform (Figs 10–11)............ E. retrorsum sp. nov.

- Femorite without apical shelf b. Process p large, shaped otherwise............................................. 5

5 Solenomere large, twisted in distal part; process e large, serrate at anterior margin; process p anchor-shaped; apical self b absent (Fig. 2)........................................................................... E. anchoriforme

- Solenomere large, spiralled; distal part with a tooth terminating the seminal groove; process e small, tuberculiform; process p small, erect, subrectangular (Fig.1)............................................................ E. lanceolatum