Ranatra bilobata, Tran & Nguyen, 2016

Tran, A. D. & Zettel, H., 2021, Taxonomic review of the Ranatra gracilis group sensu Lansbury, 1972 (Nepomorpha: Nepidae), with descriptions of four new species, Raffles Bulletin of Zoology 69, pp. 45-70 : 47

Ranatra bilobata group

Diagnosis. Body length: males 34–38, females 32–40; siphon long, ratio of siphon length: body length ca. 0.9–1.1; vertex in lateral view slightly higher than eye, evenly round, tubercle small or absent; process of second antennal segment very long, about equal to third segment; flexor side of fore femur with only one tooth at midlength, without carina, pre-apical teeth absent or only with tooth-like elevation ( R. bilobata ); metasternum with posterior margin deeply emarginated, usually with a pair of sublateral tumescences (except R. sulawesii ); operculum of female not reaching apex of connexivum; male paramere with finger-like pre-apical process before hook, apical hook with pointed tip.

Species included. Ranatra sulawesii Nieser & Chen, 1991 , R. sterea Chen, Nieser & Ho, 2004 , and R. bilobata Tran & Nguyen, 2016 .

Note. For comparison between these three species, see Tran & Nguyen (2016).