NEPIDAE OCCURRING IN

Polhemus, Dan A. & Polhemus, John T., 2013, Guide To The Aquatic Heteroptera Of Singapore And Peninsular Malaysia. X. Infraorder Nepomorpha-Famlies Belostomatidae And Nepidae, Raffles Bulletin of Zoology 61 (1), pp. 25-45 : 28

KEY TO GENERA OF NEPIDAE OCCURRING IN SINGAPORE, PENINSULAR MALAYSIA AND THE GREATER SUNDA ISLANDS

Note. — The genus Telmatotrephes is not currently known from Singapore or Peninsular Malaysia, but the species are rare and very cryptic, with leaf-like bodies, therefore it is possible that diligent collecting may eventually uncover the genus in the region under study. As such, it is included in the present key as a contingency, given its occurrence on Borneo and in Thailand (Sites & J. Polhemus, 2000), but is marked with an asterisk (*) to indicate that it is currently extralimital.

1. Body dorsoventrally flattened; abdominal parasternites visible, not concealed by ventral laterotergites; head distinctly narrower than pronotum and partly enclosed in the anterolateral pronotal angles ( Fig. 30 ; subfamily Nepinae ).......................................2

– Body not dorsoventrally flattened, subcylindrical in cross section; abdominal parasternites concealed by ventral laterotergites; head and pronotum subequal in width, head not cradled between the anterolateral pronotal angles ( Figs. 3 , 7 , 8 ; subfamily Ranatrinae ).........................................................3

2. Respiratory siphon longer than the inner hemelytral commissure (measured as the distance between the apex of the scutellum and the base of the wing membrane along the inner margin of the hemelytra; Fig. 30 ) ................................. Laccotrephes Stål

– Respiratory siphon shorter, not more than half as long as the length of the hemelytral commissure......* Telmatotrephes Stål

3. Eyes in lateral view globose, not reflexed downward or obscuring ventral margin of head; respiratory siphon usually long and slender (except in R. gracilis species group; Fig. 8 )................ ...................................................................... Ranatra Fabricius

– Eyes in lateral view reflexed downwards, obscuring ventral margin of head; respiratory siphon short and stout, length about one quarter the length of the body ( Figs. 3 , 7 )......................... ................................................. Cercotmetus Amyot & Serville

Figures

Fig. 30. Laccotrephes simulatus Montandon, male, specimen from Malaysia, Johor.

Fig. 3. Cercotmetus asiaticus Amyot & Serville, female, specimen from Thailand, Chiang Mai Prov.

Fig. 7. Cercotmetus brevipes Montandon, female, specimen from Thailand, Chiang Mai Prov.

Fig. 8. Ranatra longipes Stål, female, specimen from Indonesia, Java, Bogor.