Nagaxytes, Srisonchai, Enghoff & Panha, 2018

Ruttapon Srisonchai, Henrik Enghoff, Natdanai Likhitrakarn & Somsak Panha, 2018, A revision of dragon millipedes II: the new genus Nagaxytes gen. nov., with the description of three new species (Diplopoda, Polydesmida, Paradoxosomatidae), European Journal of Taxonomy 462, pp. 1-44 : 11

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.

Figures

Fig. 9. Nagaxytes acantherpestes (Golovatch & Enghoff, 1994) gen. et comb. nov., specimen from Ban Yan Sue (Thailand), right gonopod. A. Mesal view. B. Dorsal view. C. Lateral view. D. Ventral view.

Fig. 10. Nagaxytes acantherpestes (Golovatch & Enghoff, 1994) gen. et comb. nov., specimen from Ban Yan Sue (Thailand), right gonopod. A. Lateral view. B. Mesal view. C. Ventral view. D, F. Subdorsal view. E. Dorsal view.

Fig. 13. Nagaxytes erecta Srisonchai, Enghoff & Panha gen. et sp. nov., ♂, paratype (CUMZpxDGT00002). A. Anterior body part. B. Body rings 8–10. C. Posteriormost body rings and telson. D. Head and antenna. E. ♂ leg 5 (right). F–G. Midbody ring.

Fig. 14. Nagaxytes erecta Srisonchai, Enghoff & Panha gen. et sp. nov., ♂, paratype (CUMZpxDGT00002). A. Body rings 8–10. B. Paraterga of ring 10. C–D. Last ring and telson. E. Hypoproct. F–G. Epiproct. H–J. Sternal lobe between coxae 4.

Fig. 15. Nagaxytes erecta Srisonchai, Enghoff & Panha gen. et sp. nov. (paratype, CUMZ-pxDGT00002), right gonopod. A. Mesal view. B. Dorsal view. C. Lateral view. D. Ventral view.

Fig. 16. Nagaxytes erecta Srisonchai, Enghoff & Panha gen. et sp. nov. (paratype, CUMZpxDGT00002), right gonopod. A. Lateral view. B. Mesal view. C. Ventral view. D, F. Subdorsal view. E. Dorsal view.

Fig. 18. Nagaxytes gracilis Srisonchai, Enghoff & Panha gen. et sp. nov., ♂, paratype (CUMZpxDGT00091).A.Anterior body part. B. Body rings 8–10. C. Posteriormost body rings and telson. D. Head and antenna. E. ♂, leg 5 (right). F–G. Midbody ring.

Fig. 19. Nagaxytes gracilis Srisonchai, Enghoff & Panha gen. et sp. nov., ♂, paratype (CUMZpxDGT00091). A. Body rings 8–10. B. Paraterga of ring 10. C–D. Last ring and telson. E. Hypoproct. F–G. Epiproct. H–J. Sternal lobe between coxae 4.

Fig. 20. NagaxytesgracilisSrisonchai, Enghoff&Panha gen.et sp.nov., paratype(CUMZ-pxDGT00092), right gonopod. A. Mesal view. B. Dorsal view. C. Lateral view. D. Ventral view.

Fig. 21.NagaxytesgracilisSrisonchai, Enghoff&Panha gen.et sp.nov., paratype(CUMZ-pxDGT00092), right gonopod. A. Lateral view. B. Mesal view. C. Ventral view. D, F. Subdorsal view. E. Dorsal view.

Fig. 25.Nagaxytes spatula Srisonchai, Enghoff& Panhagen. et sp. nov.,paratype (CUMZ-pxDGT00121), right gonopod. A. Mesal view. B. Dorsal view (arrowheads = tip of solenomere terminating in two curved processes). C. Lateral view. D. Ventral view.

Fig. 26. Nagaxytes spatula Srisonchai, Enghoff & Panha gen. et sp. nov., paratype (CUMZpxDGT00121), right gonopod. A. Lateral view. B. Mesal view. C. Ventral view (arrowhead = hook-like tip). D, F. Subdorsal view. E. Dorsal view (arrowheads = tip of solenomere terminating in two curved processes).