Guide To The Aquatic Heteroptera Of Singapore And Peninsular Malaysia. X. Infraorder Nepomorpha-Famlies Belostomatidae And Nepidae Author Polhemus, Dan A. Author Polhemus, John T. text Raffles Bulletin of Zoology 2013 2013-02-28 61 1 25 45 journal article 10.5281/zenodo.5351508 2345-7600 5351508 KEY TO GENERA AND SPECIES OF BELOSTOMATIDAE OCCURRING IN SINGAPORE AND MALAYSIA 1. Very large species, body length exceeding 60 mm ; body shape elongate-ovate and parallel-sided ( Fig. 1 ), lateral margins of hemelytra straight; inner margins of eyes parallel ...... Lethocerus indicus (Lepeletier & Serville) – Smaller species, body length less than 20 mm ; body shape more rounded, lateral margins of hemelytra outwardly arcuate ( Fig. 2 ); inner margins of eyes convergent anteriorly .................. Diplonychus rusticus (Fabricius)