Neoperla hainanensis Yang & Yang, 1995 (Fig. 6) Neoperla hainanensis Yang & Yang, 1995: 224; Du, Sivec & He, 1999: 62; Chen & Du, 2016: 244; Yang & Li, 2018: 40; Mo, Liu, Li & Shi, 2020: 375. Supplementary description (Fig. 6). Tergum 6 with a posteromedial patch of sensilla basiconica. Aedeagal tube strongly sclerotized, slightly curved ventrad, dorsally with spinules, and ventrally with a pair of short subapical nipple shaped lobes (Figs. 6c–6d). Aedeagal sac short, about 0.25X tube length, membranous, curved ventrally, and gradually tapering to a blunt tip; apical half covered by dense spinules (Figs. 6c–6d). Material examined. 1 male (CAU), China: Hainan Province, Ledong Li Autonomous County, Jianfengling Mountain, 18.7528 N, 109.1763 E. 800 m, 2013.IV.12, Sun & Zhang. Distribution. China (Hainan Province). Remarks. The aedeagal sac of Neoperla hainanensis Yang & Yang, 1995 was not everted and described in the original description. The head pattern, the dorsal terminalia, and the aedeagal tube of this single male specimen agree well with figures provided by Yang & Yang (1995). But our male specimen has a patch of sensilla basiconica on tergum 6 posteromedially, which is thought to be intraspecific variation. We provide additional illustrations to aid in the recognition of this southern China species.

{"references": ["Yang, D. & Yang, C. K. (1995) Three new species of Plecoptera from Hainan Province. Acta Agriculture Universitatis Pekinensis, 21, 223 - 225.", "Du, Y. Z., Sivec, I. & He, J. H. (1999) A checklist of the Chinese species of the family Perlidae (Plecoptera: Perloidea). Acta Entomologica Slovenica, 7, 59 - 67.", "Chen, Z. T. & Du, Y. Z. (2016) Contribution to the knowledge of Neoperla (Plecoptera: Perlidae) from Hainan Province of China. Zootaxa, 4144 (2), 243 - 252. https: // doi. org / 10.11646 / zootaxa. 4144.2.6", "Yang, D. & Li, W. H. (2018) Species catalogue of China. Volume 2 Animals, Insecta (III), Plecoptera. Science Press, Beijing, 71 pp.", "Mo, R. R., Liu, R. J., Li, W. H. & Shi, M. W. (2020) Rediscovery of two species of Neoperla (Plecoptera: Perlidae) from China. Zootaxa, 4758 (2), 369 - 377. https: // doi. org / 10.11646 / zootaxa. 4758.2.10"]}

Published as part of Mo, Raorao, Wang, Guoquan & Li, Weihai, 2021, One new species and one poorly known species of Neoperla in the montivaga group (Plecoptera: Perlidae) from Hainan Province, China, pp. 385-394 in Zootaxa 5004 (2) on pages 392-393, DOI: 10.11646/zootaxa.5004.2.7, http://zenodo.org/record/5120615