Key to species of Nagaxytes gen. nov. (based mainly on males)

1. Gonopod with lamina lateralis long (e.g., Figs 15B, 16C, 20B, 21C), or with lobe (e.g., Figs 25B, 26C) .................................................................................................................................................. 2

– Lamina lateralis short, swollen, stout, compact, without lobe (e.g., Figs 9B, 10C, F) ....................... ................................................. N. acantherpestes (Golovatch & Enghoff, 1994) gen. et comb. nov.

2. Body length 22–26 mm in male, 24–28 mm in female. Lamina lateralis with a curved, long, spatulate lobe (Figs 25–26); solenomere terminating in two curved processes (Figs 25B, 26E) ...................... .................................................................... N. spatula Srisonchai, Enghoff & Panha gen. et sp. nov.

– Body length 30–36 mm in male, 35–38 mm in female. Lamina lateralis without spatulate lobe; solenomere terminating in one process (e.g., Figs 15D, 16D, 20D, 21D) ........................................ 3

3. Metaterga 4–19 with conspicuous anterior row of tubercles/cones/spines (Fig. 13A–C). Sternal lobe between male coxae 4 subtrapeziform (Fig. 14J). Lamina lateralis erect, digitiform, thick, tip directed anteriad (Figs 15B–D, 16C, E–F) ................... N. erecta Srisonchai, Enghoff & Panha gen. et sp. nov.

– Metaterga 4–19 without anterior row of tubercles/cones/spines (Fig. 18A–C). Sternal lobe between male coxae 4 not subtrapeziform, incompletely bilobed, tip deeply emarginate (Fig. 19J). Lamina lateralis lamella-like, curved, broad, thin, tip directed mesoventrad (Figs 20B–D, 21C–F) .............. .................................................................... N. gracilis Srisonchai, Enghoff & Panha gen. et sp. nov.