Ranatra gracilis, Dallas, 1850

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 gracilis group sensu Lansbury, 1972

Diagnosis. Body length: males 25–38, females 29–43; siphon relatively short, ratio of siphon length: body length around 0.2–0.7; vertex in lateral view clearly higher than eye, with prominent tubercle; flexor side of fore femur bearing one broad tooth at distal 0.4–0.5 and a carina just proximal of tooth, a pair of pre-apical teeth on flexor side usually present (except R. parmata , R. gracilis , R. lansburyi , and R. schuhi ); posterior margin of metasternum distinctly emarginated and usually with a pair of sublateral grooves; operculum of female clearly surpassing connexivum, about 0.3 the length of operculum; male paramere with thick process on ventral side before hook, apical hook usually long.

Species included. Ranatra gracilis Dallas, 1850 , R. parmata Mayr, 1865 , R. stali Montandon, 1905 , R. distanti Montandon, 1910a , R. spinifrons Montandon, 1910b , R. odontomeros Nieser, 1996 , R. lansburyi Chen, Nieser & Ho, 2004 , R. schuhi D. Polhemus & J. Polhemus, 2012 , R. heoki Tran & Poggi, 2019 , R. bisaya , new species, R. bendanilloi , new species, R. brevicauda , new species, and R. pangantihoni , new species.