Capnia s.l. longicauda Zhiltzova, 1969

Teslenko, Valentina A. & Palatov, Dmitry M., 2021, A poorly known species and new records of Plecoptera from the Eastern Tien Shan, Xinjiang Uygur Autonomous Region, China, Zootaxa 4950 (1), pp. 123-136 : 127

Capnia s.l. longicauda Zhiltzova, 1969

Figs. 11–12

Zhiltzova, 1969:596, figs. 1–4; Zwick, 1973:374; Zwick & Sivec, 1980:72, figs. 7a, d; Zhiltzova, 2003:360, figs. 603–605; Teslenko & Zhiltzova, 2009: 203, figs. 1124–1126; Muranyi, Li & Yang, 2015:379.

Material examined. China, the Xinjiang Uygur Autonomous Region, Eastern Tien Shan: 9 males, 1 female, 3 exuviae, Bogdo-Ula Range , Urumqi city, Dabancheng District , Lake Sangecha , altitude 3,503 m above sea level, 12.VII.2017, N 43°48.228’, E 88°16.339’, leg. D.M. P .

Notes. This species was originally described from Aksu-Zhabagly Nature Reserve, Kazakhstan ( Zhiltzova 1969). Zwick & Sivec (1980) provided a supplementary description from Himalayan specimens.

Male. Body is 6.8–9.3 mm in length, antenna length 8.6–10.4 mm, cerci length 8.2–9.7 mm (n=8). The wings are reduced, their length not exceeding 0.5 mm. Tergum 9 bears two spoon-shaped projections posteriorly; projections elongated, darkly sclerotized dorsally, with rounded margins, and divided with rectangular notch ( Figs. 11– 11b ). Basal sclerite large, longitudinally elongated, slightly sclerotized ( Fig. 11a ). Main epiproct sclerite elongated, sharply curved basally, directed forward and upward, slightly widened in the middle of the length; apex rounded and open ( Figs. 11–11b ). Laterobasal sclerite fused with main epiproct sclerite, resembling a small, pigmented acuteangled protrusion ( Figs. 11, 11a ). Subgenital plate narrowed and rounded posteriorly ( Fig. 11b ). Paraprocts triangularly curved, wide basally and noticeably narrowed to the apices ( Fig. 11b ). Fusion plate fused to paraprocts in their basal half. Fusion plate relatively long, reaching basal portion of main epiproctal sclerite ventrally Figs. (11–11b).

Female. Body length 11.7 mm, wings extend beyond the tip of the abdomen, fore wing length 11.6 mm, wingspan 24.9 mm. Sternum 8 unevenly pigmented, median, rounded pale spot flanked by a pair of dark brown patches laterally; posterior margin of sternum is straight ( Fig. 12 ). Subgenital plate greatly shortened, occupying ¼ of the sternum 8 length. Subgenital plate is pale, with almost straight posterior margin. A pair of elongate-oval brown lateral sclerites fused with lateral edges and is directed to brown patches ( Fig. 12 ). Genital opening broad, inner sclerite thin, longitudinal, weakly sclerotized, it is visible through the subgenital plate medially ( Fig. 12 ).

Distribution and ecology. Capnia s.l. longicauda has the widest distribution among the Capniidae known in the Palaearctic and Oriental Realm ( Muranyi et al. 2015). The species was reported in the Western and Central Tian Shan, the Eastern Himalayas, and Karakoram ( Zwick, Sivec, 1980). The species occurs at altitudes of 2,000 –5,150 m above sea level at the foot of glaciers and in glacial lakes, in the upper reaches of mountain streams and rivers. The emergence is extended from late May to late July. Capnia s.l. longicauda is recorded for the Eastern Tien Shan and stonefly fauna of China for the first time. This species was collected in alpine glacial Sangecha Lake, the Bogdo-Ula Range at an altitude 3,503 m above sea level. Sangecha Lake is fed by a melting glacier and lies in a glacial cirque that is 900 m long and 700 m wide ( Figs. 33, 34 ). The rocky shores are formed by the moraine and talus. Even in July the Sangeсha Lake is covered with ice. There is no vegetation on the shore line, with the exception of rare rosettes of alpine flowers ( Figs. 33, 34 ).

Figures

FIGURES 11–12. Capnia s.l. longicauda. 11. Male, habitus. 11a. Male abdominal tip, dorso-caudal. 11b. Male abdominal tip, caudal. 12. Female, abdominal tip, ventral.

FIGURES 33–37. Сollecting places in the Xinjiang Uygur Autonomous Region, the Eastern Tien Shan. 33. Bogdo-Ula Range, a glacier near Lake Sangecha. 34. Lake Sangecha. 35. Sangecha Stream. 36. Bogdo-Ula Range, Zienzan Stream. 37. Karlyktag Range, Ayar-Gol Stream.