Capnia, Pictet, 1841

Shen, Ting, Cao, Jinjun, Li, Weihai & Bozdoğan, Hakan, 2021, Contributions to the winter stoneflies (Plecoptera: Taeniopterygidae & Capniidae) of China, Zootaxa 5016 (4), pp. 543-558 : 552-553

Capnia s.l. sp.

( Figs. 10b , 11 )

Examined Material. 1 female ( CUAC): China, Tibet Autonomous Region, Nyingchi County, Sejilashan ( Sejila Mountains ), Sejilashan National Natural Reserve , unnamed stream at Zhongshan Station , N 29°36.60' E 94°36.19', 4300 m, 2014.VII.10–VIII.20 , Malaise trap, Qicheng Yang; 2 females ( CUAC): same locality and collector, 2017. VII.5–VIII.5.

Description. Body generally dark brown. Wings macropterous, hyaline with brown veins. Body length ca. 6.6 mm. Forewing length ca. 5.8 mm, hindwing length ca. 5.0 mm (n=3). Terga 1-8 with membranous medial portion ( Fig. 10b ). Sternum 8 with a rounded membranous area anteromedially, subgenital plate large and entire, covering most of sternum 8 but not extending to sternum 9. The subgenital plate is U-shaped with lateral margin narrowed at middle, posterior edge rounded and bearing a projecting hook on each posterolateral corner. A pair of small triangular lateral sclerites occurring on the posterior margin of sternum 8 and lateral to the small hooks of subgenital plate. Sternum 9 with a medial, elongated triangular sclerite. Two rectangular sclerites residing beside the medial sclerite covering most of the lateral portion of the sternum 9 but laterally not fused with tergum; the anterior third of inner margin narrowed ( Fig. 11a ). In the oblique lateral view, the subgenital plate is flattened ( Fig. 11b ).

Remarks. This unassociated female belongs to the Capnia s.l. cordata group sensu Zhiltzova (2001). The remarkable medial sclerite of sternum 9 distinguishes it from all other known females of the group. Given that only the female of C. s.l. qilianshana Li & Yang, 2009 remained unknown, the present females most probably belong to an unnamed species.

Figures

FIGURE 10. Adult habitus. a. Capnia s.l. yunnana Li & Yang (male). b. Capnia s.l. sp. (female).

FIGURE 11. Capnia s.l. sp. (female) a. Terminalia after 10% NaOH treatment, ventral view. b. Terminalia after 10% NaOH treatment, oblique lateral view.