Isocapnia apicispina Chen & Du, 2017

Chen, Zhi-Teng & Du, Yu-Zhou, 2017, New species and a new record of Capniidae (Plecoptera) from Xinjiang Uygur Autonomous Region of northwestern China, Zootaxa 4311 (1), pp. 122-128 : 124

publication ID

https://doi.org/ 10.11646/zootaxa.4311.1.8

publication LSID

lsid:zoobank.org:pub:B5EAC05C-9D88-43FC-8105-4E6B439C98F1

DOI

https://doi.org/10.5281/zenodo.6001269

persistent identifier

https://treatment.plazi.org/id/037E8865-6736-FF9A-60D1-FC2EB321EC66

treatment provided by

Plazi

scientific name

Isocapnia apicispina Chen & Du
status

sp. nov.

Isocapnia apicispina Chen & Du View in CoL , sp. nov.

Figs. 7–15 View FIGURES 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 View FIGURES 7 – 15 ). 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 View FIGURES 7 – 15 ). Legs brown to dark brown. Cerci slender and brown, each segment parallel-sided with long distal hairs ( Fig. 7 View FIGURES 7 – 15 ).

Male abdomen: Tergum 9 strongly concave and sclerotized at anterior and posterior margins ( Fig. 8 View FIGURES 7 – 15 ). 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 View FIGURES 7 – 15 ). 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 View FIGURES 7 – 15 ). Sternum 9 with a fusiform, setose vesicle, with a thin basal stem, length ⅓ of subgenital plate ( Fig. 10 View FIGURES 7 – 15 ). Subgenital plate broad basally and sharp apically, strongly sclerotized anterolaterally; paraprocts curved, anterolateral margins obtuse ( Fig. 10 View FIGURES 7 – 15 ).

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 View FIGURES 7 – 15 ). 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 View FIGURES 7 – 15 ).

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) GoogleMaps . Paratypes: 1 male and 6 females, same locality and data as holotype ( ICYZU) GoogleMaps .

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 View FIGURES 7 – 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).

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Plecoptera

Family

Capniidae

Genus

Isocapnia

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