Key to the species of male Rheumatogonus of Thailand

(modified from Chen & Nieser 2002)

1. Paramere with basal tooth pronounced; paramere semicircular (Fig. 39)............................... .. R. intermedius

1’. Paramere with basal tooth indistinct or lacking; paramere basal 2/3 parallel sided, distal 1/3 roundly right-angled (Fig. 38)............................................................................................. R. vietnamensis