Capnia trispinosa Chen & Du 2017, sp. nov.
Creators: name: Chen, Zhi-Teng
name: Du, Yu-Zhou
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Plecoptera
Capniidae
Capnia
Capnia trispinosa

description: Capnia trispinosa Chen & Du, sp. nov.
Figs. 1–6.
Male. Body length 5.9–6.6 mm. Forewings length 5.4–5.9 mm, hindwings length 4.5–5.0 mm. Body generally brown. Head wider than pronotum, antennae dark brown; three ocelli pale, compound eyes dark (Fig. 1). Pronotum subquadrate, corners obtuse. Wings macropterous, exceeding tip of abdomen, hyaline with brown veins; R vein of forewing curved at its divergence with Rs; anal field of hindwing small and folded with three veins. Tergal antecosta complete on terga 6–7, interrupted on other abdominal segments (Fig. 1). Legs generally brown. Cercus slender and hairy, with each segment enlarged distally (Fig. 1).
Male abdomen: Terga 5–10 with sclerotized anterior margins (Figs. 1–2). Tergum 7 with a hump-like, darkly sclerotized posteromedial process, bearing sensilla basiconica (Figs. 2–3). Tergum 8 strongly incised anteromedially, with posterior membranous area extending to base of epiproct. Terga 9–10 cleft and sclerotized with median membranous area. From dorsal aspect, main epiproct sclerite long triangular with a tongue-shaped apex; apical ¼ and basal ¼ with three large spines, the basal spine being the distal, upcurved end of the inner sclerite and the paired apical spines representing sclerotized portions of the eversible crest; two ridges elevated from near base of the paired anterior spines to posterolateral margins, median area with furrows; posterior margin with two dark sclerites, covered by long caudal setae (Fig. 5). In lateral aspect, the lower portion of the main epiproct sclerite widened and rounded; apex of main epiproct sclerite blunt with arced ventral surface (Fig. 6). Sternum 9 lacking a vesicle; subgenital plate spade-shaped with sclerotized margins; paraprocts unfused and elongated (Fig. 4).
Female. Unknown.
Type material. Holotype: male, China: Xinjiang Uygur Autonomous Region, Fuyun County, Riverside Park, Eerqisi River, 793m, 46.9865 N, 89.5247 E, 16 April, 2017, Hai-Yang Xue (ICYZU). Paratype: 2 males, same locality and data as holotype (ICYZU).
Etymology. The specific epithet refers to the three dorsal spines of epiproct.
Remarks. The male genitalia of the new species is similar to the C. atra Morton, 1896 species group (Zhiltzova 2001). Capnia trispinosa is most similar to C. ahngeri Koponen, 1949 (in: Koponen & Brinck 1949) from the Russian Far East, but can be distinguished by the three large dorsal spines of the main epiproct sclerite. In C. ahngeri, the main epiproct sclerite is much narrower with only two dorsal spines; tergum 9 is not completely divided; process on tergum 7 is much wider; shape of membranous areas on terga 6–10 is distinct from that of the new species (see figs. 1067–1069 in Teslenko & Zhiltzova 2009).
description: Published as part of Chen, Zhi-Teng & Du, Yu-Zhou, 2017, New species and a new record of Capniidae (Plecoptera) from Xinjiang Uygur Autonomous Region of northwestern China, pp. 122-128 in Zootaxa 4311 (1) on pages 123-124, DOI: 10.11646/zootaxa.4311.1.8, http://zenodo.org/record/847399