Taxonomy of the Ranatra biroi group sensu Lansbury, 1972 (Nepomorpha: Nepidae), with descriptions of two new species Author Tran, A. D. Author Zettel, H. text Raffles Bulletin of Zoology 2021 2021-12-03 69 507 521 journal article 10.26107/RBZ-2021-0068 2345-7600 7174619 F6D44BD6-1F2A-4DBE-9226-D099FF6E0817 Ranatra recta Chen, Nieser & Ho, 2004 Ranatra recta Chen, Nieser & Ho, 2004: 97–98 ( type locality: Guangdong , China ). Material examined. No material available. Diagnosis (based on description by Chen et al., 2004 ). Body length: males 22.8, females 21.8–23.2; siphon length ca. 0.65–0.80× body length; lorum lower than clypeus; vertex higher than eye, with low conical tubercle; eye width ca. 1.1× interocular width; space between middle coxae about 0.7× space between hind coxae; posterior margin of metasternum straight or slightly emarginated; hind femur, when folded back parallel to body, surpassing anterior half but not reaching apex of operculum (in both sexes); paramere gradually tapering from distal third towards finger-like apical hook, tip of hook rounded, not expanded, ventral margin with a low and blunt tooth-like elevation immediately basad of hook. Remarks. This species is most similar to R. incisa . For comparative notes, see Chen et al. (2004) . Distribution. China : Guangdong and possibly Fujian (see Chen et al., 2004 ).