New species and a new record of Capniidae (Plecoptera) from Xinjiang Uygur Autonomous Region of northwestern China Author Chen, Zhi-Teng Author Du, Yu-Zhou text Zootaxa 2017 4311 1 122 128 journal article 32338 10.11646/zootaxa.4311.1.8 5e6563e0-8fb4-46db-8304-ec160a9d9e98 1175-5326 847399 B5EAC05C-9D88-43FC-8105-4E6B439C98F1 Isocapnia apicispina Chen & Du , sp. nov. Figs. 7–15 . Male. Body length 10.6 mm . Forewings length 9.7 mm , hindwings length 8.7 mm . Body generally dark brown. Head rounded, nearly as wide as pronotum; three ocelli pale, compound eyes dark ( Fig. 7 ). Pronotum quadrate, corners obtuse. Wings macropterous, subhyaline with brown veins; forewings with four costal cross veins before end of Sc; hindwings with four costal cross veins before end of Sc; anal field of hindwings small and folded with three veins. Tergal antecosta interrupted on terga 1–5 and 10, complete on terga 6–9 ( Fig. 7 ). Legs brown to dark brown. Cerci slender and brown, each segment parallel-sided with long distal hairs ( Fig. 7 ). Male abdomen: Tergum 9 strongly concave and sclerotized at anterior and posterior margins ( Fig. 8 ). Tergum 10 cleft with sclerotized margins. From dorsal aspect, basal sclerite trapezoidal and slightly depressed posteriorly. Main epiproct sclerite gradually tapered from base to the triangular apex from dorsal view ( Fig. 8 ). In lateral view, main epiproct sclerite upcurved and gradually constricted with a ventroapical spine, bearing sparse setae; dorsal surface of apical main epiproct sclerite truncated, lateral margins with small sensilla ( Figs. 9, 11 ). Sternum 9 with a fusiform, setose vesicle, with a thin basal stem, length ⅓ of subgenital plate ( Fig. 10 ). Subgenital plate broad basally and sharp apically, strongly sclerotized anterolaterally; paraprocts curved, anterolateral margins obtuse ( Fig. 10 ). Female. Body length 14.5–15.0 mm. Forewings length 10–10.5 mm , hindwings length 9.5–10.0 mm. General color similar to male; terga 2–8 with median membranous area ( Fig. 12 ). Sternum 8 with a medially constricted subgenital plate butterfly-like shaped, the plate anteriorly connected with dark anterior sclerites; the lateral sclerites subtriangular, with punctuate surface and darkly sclerotized anterior angles ( Fig. 13 ). Type material. Holotype : male, China : Xinjiang Uygur Autonomous Region, Fuyun County , Riverside Park , Eerqisi River , 793m , 46.9865 N , 89.5247 E , 29 April , 2017, Hai-Yang Xue ( ICYZU ) . Paratypes : 1 male and 6 females , same locality and data as holotype ( ICYZU ) . Etymology. The specific epithet refers to the apical spine of epiproct. Remarks. Male paratype of the new species is strongly micropterous (forewings length 0.75 mm , hindwings length 0.5 mm ) and its main epiproct sclerite is more curved, indicating the presence of wing polymorphism in this species ( Figs. 14–15 ). The new species seems most similar to I. arcuata Zhiltzova, 1975 (in: Zhiltzova et al . 1975 , Zenger & Baumann 2004 ) from Russia , but can be distinguished by its dorsal apex of main epiproct sclerite truncated with denticulate lateral margins, by having a ventroapical spine on epiproct, and by the sclerite of sternum 8 in the shape of a butterfly. In I. arcuata , male main epiproct sclerite is much longer with a rounded tip; shape of sclerite on sternum 8 in females also differs from that in the new species (see figs. 1038–1040 in Teslenko & Zhiltzova 2009 ).