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 libera Zettel, 1999 Ranatra libera Zettel, 1999: 427–428 , 430 ( type locality: Bago Division , Myanmar ). Type material examined. Holotype (male) and paratypes ( 3 females ), “ BURMA : Bago Div. / Bago Yoma , Sein Yai For. / Camp , 1700m , 29.10.1998 , l. Schillhammer (36)” ( NHMW ). Additional material. THAILAND : 2 males , Salween Basin , coll. S. H. Tan & N. Sivasothi , 19 March 1996 , TG1 ( ZRC ) . Diagnosis. Body length: males 26.0, females 27.0–28.0; siphon length ca. 0.95–1.05× body length; lorum higher than clypeus; vertex higher than eye, without tubercle; eye width ca. 1.2× interocular width; space between middle coxae narrower than space between hind coxae; posterior margin of metasternum convex; hind femur, when folded back parallel to body, slightly surpassing apex of abdomen (in both sexes); paramere relatively broad, apical hook slender, strongly recurved at base, gap between hook and main part of paramere very narrow, tip of hook narrow. Distribution. Myanmar , Thailand ( Zettel, 1999 ; Polhemus & Polhemus, 2012 ; Tran & Nguyen, 2016 ).