Nerthra, Say, 1832

Polhemus, Dan A. & Polhemus, John T., 2012, Guide To The Aquatic Heteroptera Of Singapore And Peninsular Malaysia. Ix. Infraorder Nepomorpha, Families Ochteridae And Gelastocoridae, Raffles Bulletin of Zoology 60 (2), pp. 343-359 : 356

KEY TO THE SPECIES OF NERTHRA

occurring in Singapore and Peninsular Malaysia

1. Front of head bearing 2 large, pointed tubercles; pronotum with lateral margins multilobate; scutellum bearing 2 prominent tubercles; hemelytron with membrane fully developed .......... ........................................................... O. lobata (Montandon)

– Front of head bearing 3 large, rounded tubercles; pronotum with lateral margins evenly curving, not multilobate; scutellum lacking tubercles; hemelytron with membrane reduced or entirely coriaceous ( Fig. 29 ).................. N. macrothorax (Montrouzier)

Figures

Figs. 29–34. Ochterus species, colour photographs of head, anterior view, showing pattern of striations on frons.29, O. marginatus (Latreille), female, specimen from Vietnam, Cao Bang Prov., CL 4368. 30, O. thienemanni Jaczewski, female, specimen from Indonesia, Bali Prov., CL 2170. 31, O. signatus, new species, female, specimen from Vietnam, Lam Dong Prov., CL3085. 32, O. pseudomarginatus, new species, female, specimen from Malaysia, Perak, CL 2078. 33, O. noualhieri Baehr, female, specimen from Indonesia, Sulawesi Utara Prov., CL 2114. 34, O. singaporensis, new species, male, specimen from Singapore, Bukit Timah.