Mesonemoura longiflagellata Xiao & Qian,

Xiao, Qian, Zhao, Jing, Qian, Yu-Han & Du, Yu-Zhou, 2019, Two new species of Mesonemoura (Plecoptera: Nemouridae) from Yunnan Province of China, Zootaxa 4565 (4), pp. 531-538: 531-533

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Mesonemoura longiflagellata Xiao & Qian

sp. nov.

Mesonemoura longiflagellata Xiao & Qian  sp. nov.

Figs. 1–10View FIGURE 1View FIGURES 2–5View FIGURES 6–10

Adult habitus. General color dark brown. Head dark brown to black, antennae dark brown, palpi brown. Thorax

dark brown, pronotum trapezoid, wider than long, rugosities scattered. Legs dark brown, femora and tibiae with a yellowish band. Wings light brown, veins dark brown. Abdomen brown, terminal segments dark brown ( Fig. 1View FIGURE 1).

Male terminalia. Terga 1–7 sclerotized of the anterior area. Tergite 8 anteriorly sclerotized. Sterna 1–8 mostly membranous, laterally sometimes speckled. Tergite 9 sclerotized laterally and anteriorly, medially membranous, tiny bristles at the junction of the membranous and sclerotized area ( Figs. 2View FIGURES 2–5, 6View FIGURES 6–10). Hypoproct of sternite 9 broad basally, abruptly tapering toward the apex, apically blunt; vesicle elliptical and slender, medially membranous ( Fig. 3View FIGURES 2–5). Tergite 10 strongly sclerotized, medially membranous with sparse tiny bristles laterally of membranous area anteriorly of tergite 10 ( Figs. 2, 5 6, 8View FIGURES 2–5View FIGURES 6–10). Epiproct slender, basally and marginally sclerotized, median portion membranous. Flagellum dark brown, long and broad basally, tapering slightly towards the apex, curved in dorsal view, tip blunt and membranous in dorsal and lateral view ( Figs. 2, 5View FIGURES 2–5, 6, 7View FIGURES 6–10). Paraproct with 3 lobes: inner lobe sclerotized, apex bifurcate and pointed of the same length; median lobe consists of two parts, inside portion strongly sclerotized with tip with a row of tiny spines, outside portion membranous, shorter than inside portion and with many hairs, connected with outer lobe; outer lobe slender, entirely sclerotized, basal recurved along the cerci, tip blunt. ( Figs. 3View FIGURES 2–5, 9View FIGURES 6–10). Cerci cylindrical, bearing many hairs, slightly bent inwards ( Figs. 2, 3, 5View FIGURES 2–5, 6View FIGURES 6–10).

Female terminalia. Pregenital plate on sternite 7 appears as an inverted triangle, posteriorly reaching anterior margin of sternite 8. Sternite 8 with sclerotized subgenital plate, semicircular and deeply indented in the middle. A pair of symmetrical arc-shaped lateral sclerites, a part under the middle of subgenital plate, and the other part stretches out the subgenital plate and reach the posterior margin of sternite 8. Sternite 9 sclerotized posteriorly and medially with indented membranous area. ( Fig. 4View FIGURES 2–5, 10View FIGURES 6–10).

Material examined. Holotype male, CHINA: Yunnan Province, Shangri-la City, Pudacuo National Park , 27°52’17” N, 99°54’26” E, 3879 m, 11 September 2017, Leg. Qian Xiao, Yu-Han Qian, Jia-Hao ChenGoogleMaps  . Paratypes: 3 males and 5 females, same data as holotype ( ICSFU)GoogleMaps  . 3 males and 2 females, CHINA: Yunnan Province, Shangrila City, Baima Snow Mountain Nature Reserve , 28°18’33” N, 99°8’9” E, 3514 m, 18 July 2017, Leg. Yu-Han Qian, Qian Xiao, Ming-Xue Xie, Jia-Hao Chen, Jin-Long WeiGoogleMaps  .

Etymology. The Latin name “ longiflagellata  ” means with a long flagellum, referring to the distinctly long flagellum of the epiproct.

Remarks. The new species is apparently closely related to M. sbordonii Fochetti & Sezzi, 2000  from Yunnan Province of China, M. spiroflagellata ( Wu, 1973)  and M. sichuanensis Du & Ji, 2015  from Sichuan Province of China, M. tritaenia Li & Yang, 2007  from Henan Province of China. The male and female of M. longiflagellata  can be distinguished from the M. sbordonii  by the long flagellum without a forked tip and the pregenital plate of female not reaching sternite 9, and the semicircular subgenital plate with a pair of symmetrical arc-shaped lateral sclerites. Additionally, the male paraproct and the female pregenital plate of the new species differ from M. spiroflagellata  and M. tritaenia  . Mesonemoura longiflagellata  also has a row of tiny spines on the tip of the median lobe of paraproct differing from M. sichuanensis  .