Eucapnopsis yunnana Cao & Yang & Li 2020, sp. nov.
Creators: name: Cao, Zhishan
name: Yang, Ding
name: Li, Weihai
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Capniidae
Eucapnopsis
Eucapnopsis yunnana

description: Eucapnopsis yunnana sp. nov.
Adult habitus. (Figs. 1, 2, 6). Body generally brown to dark brown. Wings macropterous, hyaline with brown veins. Two crossveins between the C vein and Sc 1 vein (Fig. 2). Head slightly wider than pronotum, with three pale ocelli, compound eyes dark. Antennae slender, approximately same length as forewing. Pronotum wider than long, corner obtuse, with dark rugosities. Legs brown to dark brown (Fig. 1). Cerci slender and brown, distinctly shorter than the abdomen, with 4–5 segments in the types. The length of each segments gradually getting longer towards apex, the basal one nearly 0.1 mm, but the distal segment ca. 0.2 mm. Segments clubbed, covered with thick setae, and distal portion of each segment enlarged (Figs. 6 c–6d).
Male (Figs. 2–6). Body length 4.8–4.9 mm. Forewing length 5.5–5.6 mm, hindwing length 5.1–5.2 mm. Terga 5–10 with sclerotized anterior margins. Tergum 9 slightly concave at midlength and sclerotized at anterior margin, without posteromedial lobe. In lateral view, not elevated (Figs. 3 b–3c). Tergum 10 strongly sclerotized at anterior margin, with a deep subtriangular indentation (Figs. 3a, 3d). Sternum 9 bearing an elliptical, hairy medium sized to large, longer than wide vesicle, posteriorly nearly reaching 1/2 of the subgenital plate. Subgenital plate semi-elliptical with sclerotized margins (Figs. 3b, 6 a–6b). Paraprocts apical part medium long and tapering. Fusion plate long and narrow (Figs. 3b, 5d). The main epiproct sclerite generally quadrate, corners obtuse, bears a hook at the apex. Concavity between main sclerites trapezoidal. Additionally, the inner margin of main sclerite slightly constricted at 1/6 and dilated at 5/6 (Figs. 3e, 4b, 5 a–5c). In frontal view, basal sclerite divided from two main epiproct sclerites, with a medial opening between the two main epiproct sclerites (Fig. 4a). In the lateral view, the main epiproct sclerite subtriangular, the basis of apical flattened but the hook obvious (Figs. 3c, 5b). In the ventral view, the main epiproct sclerite cleft and rectangular (Fig. 5d).
Female (Figs. 1, 7). Body length 5.5–5.6 mm, forewing length 5.6–5.7 mm, hindwing length 5.0– 5.1 mm. Terga 2–10 sclerotized anterior margin, and with membranous medial portion on terga 2–8 (Fig. 1). Sternum 7 forming a large trapezoidal sclerite, covering 3/4 width of the sternum, the lateral margin sinuous, a small slender subrectangular sclerite present on each side of the plate. The subgenital plate triangular and wide, not protruding beyond sternum 8, anterior to the plate occurring a subtriangular medial sclerite, the sclerite as wide as the membranous area of it. Sternum 8 with two lateral sclerites that extend medially, the lateral margin of the sclerites covering most of the length of the sternum (Fig. 7).
Type Material. Holotype male (HIST), China: Yunnan Province, Deqing County, Baima Mountain, 98°57′E, 27°24′N, 4295m, 13. IV. 2009, W. Li. Paratypes: 5 males and 4 females, same locality and data as holotype, 2 fe- males, same locality and collector, 22. III. 2016.
Distribution. Yunnan Province, China. The type series is only known from a stream draining Baima Snow Mountain in northwestern Yunnan Province, an area of alpine coniferous forests.
Etymology. The species refers to the province where the type locality of the new species is located.
Remarks. The new species is generally similar to E. stigmatica. The male genitalia of the E. yunnana is most similar to the E. s. stigmatica. The main sclerite of epiproct of E. yunnana is subquadrate in dorsal view, whereas the epiproct of E. s. stigmatica epiproct is rounded. In frontal view, the epiproct of E. yunnana lacks a rounded medial opening that occurs in E. s. stigmatica. The opening between the two main epiproct sclerites of E. s. stigmatica is narrow, but in E. yunnana, it is wide and its inner margin straight. The subgenital plates of the females of both species are different. The two lateral sclerites in E. s. stigmatica is smaller than that in E. yunnana. The forewing of E. s. stigmatica has six crossveins between the C vein and Sc 1 vein, whereas E. yunnana has only two crossveins. In addition, E. yunnana is also similar to E. s. transversa, but male main epiproct sclerite of E. s. transversa is characteristically flattened (both in lateral view and in frontal view). The male of E. yunnana is also similar to E. quattuorsegmentata and E. brevicauda (Judson & Nelson 2012, Murányi et al., 2014) in the variable morphology of the epiproct, but typical specimens differ in the shape of the two main epiproct sclerites, and the opening between the two main epiporct sclerites. The females of E. quattuorsegmentata and E. brevicauda are distinctly different from E. yunnana by possessing entirely pale subgenital plates.
description: Published as part of Cao, Zhishan, Yang, Ding & Li, Weihai, 2020, A new species of Eucapnopsis (Plecoptera: Capniidae) from China, pp. 142-148 in Zootaxa 4779 (1) on pages 143-146, DOI: 10.11646/zootaxa.4779.1.11, http://zenodo.org/record/3831660