Naucoris, Geoffroy, 1762

Polhemus, Dan A. & Polhemus, John T., 2013, Guide To The Aquatic Heteroptera Of Singapore And Peninsular Malaysia. Xi. Infraorder Nepomorpha- Families Naucoridae And Aphelocheiridae, Raffles Bulletin of Zoology 61 (2), pp. 665-686 : 668

KEY TO SPECIES OF NAUCORIS

occurring in Singapore, Peninsular Malaysia, and Indochina

1. Body shiny; hemelytral commisure arcuate; brachypterous forms predominant, with forewing membranes reduced, apices pointed; male right paramere with apex rounded, not hooked ( Fig. 3 ); Thailand and Vietnam............. N. sigaloeis La Rivers

– Body dull; hemelytral commisure straight; macropterous forms predominant, forewing membranes usually fully developed, apices rounded ( Fig. 15 ); male right paramere with apex hooked to some extent ( Figs. 6, 8 )......................................................2

2. Very small species, body length less than 5 mm; apex of male right paramere with a small, blunt, upward-pointing hook ( Fig. 8 ); Singapore...................................... N. minutus , new species

– Body length exceeding 6 mm .................................................3

3. Apex of male right paramere with a sharp, downward-pointing hook ( Fig. 6 ); female subgenital plate elongate ( Fig. 13 ); widespread from Southeast Asia to Australia........................... ...................................................................... N. scutellaris Stål

– Female subgenital short and truncate ( Fig. 14 ); male unknown; Sumatra (?) ............................................. N. sumatrensis Fieber

Figures

Figs. 2–10. Naucoris species, structural details of male genitalia. 2–4. N. sigaloeis La Rivers, specimen from NE Thailand. 2. Left paramere. 3. Right paramere. 4. Phallotheca. 5, 6. N. scutellaris Stål, specimen from Singapore, Lower Fort Peirce Forest. 5. Left paramere. 6. Right paramere. 7–10. N. minutus, new species, specimen from Singapore, Chestnut Drive. 7. Left paramere. 8. Right paramere. 9. Phallotheca. 10. Proctiger.

Fig.15. Naucoris minutus, new species, male, colour photo of dorsal habitus. Specimen from Singapore, Chestnut Drive.

Figs. 11–14. Naucoris species, female terminal abdomens showing shapes of subgenital plates. 11. N. minutus, new species, specimen from Singapore, Chestnut Drive. 12. N. scutellaris Stål, specimen from Malaysia, Perak, S. of Grik, CL 2077. 13. N. sigaloeis La Rivers, specimen from Vietnam, Dông Nai Prov., Nam Cát Tiên National Park. 14. N. sumatranus Fieber, holotype from Sumatra (after Zettel, 2011).