Capniella nodosa Klapálek, 1920

Cao, Zhishan, Yang, Ding & Li, Weihai, 2021, The first records of Capniella (Plecoptera: Capniidae) from northeast China, Ecologica Montenegrina 48, pp. 49-61 : 56-57

Capniella nodosa Klapálek, 1920

( Figs. 8–12 )

Capniella nodosa Klapálek, 1920 — Klapálek 1920: 3–6; Claassen 1940: 98; Illies 1966: 151–152; Zhiltzova 1995: 28; Zhiltzova 2003: 427; Teslenko & Zhiltzova 2009: 698.

Adult habitus ( Figs. 8–9 ): Body generally brown to dark brown; wings brachypterous, hyaline with brown veins. Forewing: one crossvein between the C vein and Sc veins, R1 vein strongly curved, A1 vein straight, cubital cell triangular. Hindwing similar to forewing but with less crossveins, anal field long but only moderately deep. Head slightly wider than pronotum, with three pale ocelli, posterior ocelli set close to compound eyes that are round and dark. Antennae and palpi yellowish-brown, antennae is about half as long as body length. Pronotum quadrangular, corners obtuse. Legs brown to dark brown. Cerci with 14–15 segments, distal portions of each segments enlarged.

Male ( Figs. 8a , 10a–c , 11–12 ): Body length 4.3–4.8 mm, forewing length 1.8–2.2 mm, hindwing length 1.5–1.8 mm. Terga 4–10 with distinctly sclerotized antecosta, terga 6–7 deeply concaved anteromedially. Tergum 6 with a spherical, darkly sclerotized posteromedial process; tergum 7 with two spherical and darkly sclerotized posteromedial processes, subdivided by a posteromedial cleft. All processes on terga 6–7 are bearing sensilla basiconica. Sternum 9 elliptical with sclerotized margins, vesicle absent. The paraprocts are wide and medium long, with dilated but lightly sclerotized apex; fusion plate is wide triangular. The main epiproct sclerite is strongly cleft laterally into a lower and an upper portion, the upper portion is further divided into closely set left and right parts. Each parts of the upper portion are long and triangular, apically narrowing but bear huge eversible crest. Lower portion sclerotized and broad basally, apical half upcurved, apex beak-like and bear few, small sensillae ( Fig. 12b ), while subapically bear dense hairs ( Fig. 12f ).

Female ( Figs. 8b , 10d ): Body length 6.3–6.8 mm, forewing length 3.4–3.8 mm, hindwing length 2.8–3.4 mm. Terga 1–8 full divided by median membranous area. Sterna 1–7 with quadrate posterior sclerite. The subgenital on sternum 8 is butterfly-shaped, wider than long, anterior margin strongly concaved medially; posterolateral portions dark brown. The subgenital plate covers more than three fourths of sternum 8, slightly raised in lateral view; posterolaterally connected to large, triangular lateral sclerites.

Material examined: 110 males and 205 females ( CAU & HIST), China: Heilongjiang Province, Yichun City, Wuying area, Lesser Khingan Mountains , Fenglin National Nature Reserve , Primeval red pine forest area, 48°02.30'N, 128°58.39'E, 300 m, 18. IV. 2012, J.C. Wang .

Distribution: Widely distributed in Siberia and the Russian Far East, and herein recorded from China for the first time. In China, it was found in the Fenglin National Nature Reserve, located on the northern section of the southern slope of Lesser Khingan Mountains in northeast Heilongjiang Province.

Figures

Figure 8. Capniella nodosa Klapálek, 1920 — a: male habitus, dorsal view; b: female habitus, dorsal view — scale 1 mm.

Figure 9. Capniella nodosa Klapálek, 1920 (male) — a: forewing; b: hindwing — scale 0.1 mm.

Figure 10. Capniella nodosa Klapálek, 1920 — a: male terminalia, dorsal view; b: male terminalia, ventral view; c: male terminalia, ventro-caudal view; d: female terminalia, ventral view — scale 0.1 mm.

Figure 11. Capniella nodosa Klapálek, 1920 (male) — a: male terminalia, lateral view; b: epiproct, lateral view; c: epiproct, dorsal view — scale 0.1 mm.

FIGURE 12. Capniella nodosa Klapálek, 1920 (male) — a: terminalia, dorsal view; b: epiproct, dorsal view; c: apex of the main epiproct sclerite, dorsal view; d: sensillae on the apex; e: epiproct, lateral view; f: apex of the main epiproct sclerite, lateral view.