Descriptions of the larvae of Huosoma Guan, Dumont, Yu, Han & Vierstraete 2013 from China (Odonata: Coenagrionidae) Author Yang, Guo-Hui College of Agriculture and Life Sciences, Dali University, Yunnan 671003, China. Author Orr, Albert G. Environmental Futures Research Institute, Griffith University, Nathan, Australia. Author Zhang, Hao-Miao 0000-0002-8485-7401 Kunming Natural History Museum of Zoology, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, Yunnan 650223, China. zhanghaomiao @ mail. kiz. ac. cn; https: // orcid. org / 0000 - 0002 - 8485 - 7401 zhanghaomiao@mail.kiz.ac.cn text Zootaxa 2022 2022-05-11 5134 3 426 434 journal article 55586 10.11646/zootaxa.5134.3.6 f3099cff-e242-41a4-9279-89ce6507c8d9 1175-5326 6538329 81E43FD5-C8D8-49B7-8192-5B059FF4208B Huosoma tinctipenne (McLachlan, 1894) ( Figs 2b ; 4a–m ; 6 ; 7d–e ) Material examined: 1♀ , larva, 1.V.2019 , Haicang Village , Jiuzhou Town , Yunlong County ( 25.30°N , 99.02°E , 2,550 m a.s.l. ), Dali City , Yunnan Province , China , Guo-Hui Yang leg. , 1♀ , 1♂ larvae, 6.VI.2021 , same locality, Guo-Hui Yang leg. 1♀ larva was successfully raised to emergence. Habitus : Generally similar to H. latiloba . Legs and wing sheaths relatively slightly longer ( Figs 7d, e ) and, caudal lamellae leaf shaped, longer and narrower than in H. latiloba . Head. Comparatively large, occipital lobes gently rounded, not bulbous in dorsal view; mouthparts ( Figs 4a–i ), fairly similar to H. latiloba but with relatively broader prementum, maximum breadth ca 0.78 length; length about four times wider than base; anterior margin more strongly projected as obtuse isosceles triangle, apex forming 105° angle (dorsal view), with fine marginal denticles; row of four long, strong setae sub-medially on upper side of prementum. Labial palp long and narrow, distinctly expanded apically, upper margin with six very long, strong setae set in raised tooth-like sockets ( Figs 4b, c ); movable hook short, incurved, only ca 1/2 length of longest palpal seta; palp terminating in broad securiform ‘comb’ separated by shallow notch from short ventral hook slightly exceeding margin of comb in length ( Fig. 6 ). FIGURE 4. Morphological details of the final stadium larva of H. tinctipenne : (a) prementum, ventral view; (b) same, dorsal view; (c) right labial palp, inner surface; (d) right mandible, posterior view; (e) same, inner surface; (f) left mandible, posterior view; (g) same, inner surface; (h) right maxilla; (i) left maxilla; (j) female ovipositor, ventral view; (k) S8–10 of female, one of lateral lamella absent, lateral view; (l) lateral lamella, lateral view; (m) median lamella, lateral view. FIGURE 5. Labial palp of Huosoma latiloba : left, anterior view in situ on prementum; right, showing detail, (a) inner length of comb; (b) width of comb; (c) palpal hook (measurement terminology corresponding with Brochard & van der Ploeg 2013 ). FIGURE 6. Labial palp of Huosoma tinctipenne : left, anterior view in situ on prementum; right, showing detail, (a) inner length of comb; (b) width of comb; (c) palpal hook (measurement terminology corresponding with Brochard & van der Ploeg 2013 ). Thorax. Very similar to H. latiloba but legs longer; femur of hind leg reaching to hind margin of S4; outer wing sheaths reaching just beyond hind margin of S4, inner sheaths slightly shorter ( Figs 7d–e ). Abdomen. Very similar to H. latiloba but ovipositor of female extending only to end of S10 ( Figs 4j–k ). Caudal lamellae foliate, long and narrow, more than half length of abdomen (maximum length 3.5 times width of lateral lamella and 3.2 times width of median lamella ( Figs 4l–m ). Lateral lamellae white-tipped with short terminal filament, also present in median lamella but less developed. Measurements (mm). Larvae (N=3), body length (excluding caudal lamellae) 11.5–14; length of abdomen (excluding caudal lamellae) 7.5–8; maximum head width 2.8–2.9; length of hind femur 3.6–4; lateral caudal lamella 4.5–5. Biological notes. The larvae of H. tinctipenne were found in a small, heavily vegetated shallow pond in a brook at an elevation of approximately 2,550 m ( Fig. 8b ). Adults were often present breeding in the same pond ( Fig. 7f ). The flight season ranges from June to September.