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 : 66

Ranatra gracilis Dallas, 1850

Ranatra gracilis Dallas, 1850: 10 (type locality: Bhutan). — Lansbury, 1972 (redescription). — D. Polhemus & J. Polhemus, 2013: 34 (diagnosis, records Laos and Vietnam).

[no material available]

Diagnosis (based on description by Lansbury, 1972). Body length: males 28–29, females 29–30; ratio of siphon length: body length ca. 0.30–0.35; lorum lower clypeus and without nodule dorsally; ratio of eye width: interocular width ca. 0.8; posterior width of pronotum ca. 1.2× anterior width; hemelytra slightly surpassing posterior margin of abdominal tergum VI; posterior margin of metasternum emarginated, with very narrow or indistinct sublateral grooves; fore femur on flexor side with a median tooth and a median carina, without pre-apical tooth; hind femur, when folded back parallel to body not reaching posterior margin of abdominal sternum VI (in both sexes); paramere: ventral side before apical hook with large, truncate process separated by a distinct gap from apical hook, hook with pointed tip.

Distribution. Bhutan, India (Assam), northern Thailand, Laos, northern Vietnam, Peninsular Malaysia (D. Polhemus & J. Polhemus, 2013).