Key to species of Nirvanguina (males)

1 Pygofer with apex of dorsal process irregularly dentate; aedeagal shaft strongly upturned in lateral view, with pair of serrate dorsolateral subapical flanges; gonopore apical; basal apodeme tapered dorsally in ventral view ....... N. placida

- Pygofer with apex of dorsal process pectinate (Fig. 1G); aedeagal shaft nearly straight in lateral view, with pair of dorsolateral teeth subapically; gonopore apical on ventral surface; basal apodeme broadly bilobed dorsally in ventral view (Figs. 1H, I) .......................................................................................................................................... N. pectena