Boreoheptagyia kurobebrevis (Sasa & Okazawa, 1992)

Lin, Xiao-Long, Yu, Hai-Jun, Wang, Xin-Hua, Bu, Wen-Jun, Yan, Chun-Cai & Liu, Wen-Bin, 2021, New or little-known Boreoheptagyia (Diptera, Chironomidae) in China inferred from morphology and DNA barcodes, ZooKeys 1040, pp. 187-200 : 187

Boreoheptagyia kurobebrevis (Sasa & Okazawa, 1992) Figs 1 , 2 , 3 , 4

Diamesa kurobebrevis Sasa & Okazawa, 1992: 58.

Toyamadiamesa kurobebrevis Sasa & Kikuchi, 1995: 205.

Boreoheptagyia kurobebrevis Endo, 2002: 12; Makarchenko et al. 2008: 8; Ashe and O’Connor 2009: 265.

Material examined.

Male (NKU & BOLD sample ID: LGS63), 1 male, China, Guizhou Province, Qiandongnan Miao and Dong Autonomous Prefecture , Leishan , Leigongshan Natural Reserve , Fangxiang , Getoucun , 26.396014°N, 108.260933°E, 1070 m a.s.l., Malaise trap, 10-30. i. 2020, leg. H.-J. Yu. 1 female, same as above .

Diagnostic characters.

B. kurobebrevis can be distinguished from other related species in having: antenna with five flagellomeres; wing membrane covered with microtrichia on entire surface. Costal extension 175 μm long. R with 31 setae, R1 with 34 setae, R4+5 with 31 setae. Superior volsella rounded; inferior volsella finger-like and well-sclerotized; gonostylus with 2 small megasetae.

Adult male

(N = 1). Total length 2.95 mm. Wing length 2.60 mm. Total length/wing length 1.13. Wing length/length of profemur 2.17.

Coloration (Fig. 1 ). Head, thorax and abdomen mostly dark brown. Ground color of scutum yellow, stripes and postnotum dark brown, scutellum brown, abdominal tergites almost uniformly yellow, hypopygium dark brown, femur yellow in basal three-quarter with brown ring apically, tibia pale medially with brown rings in basal one-fifth and distal one-third.

Head. Antenna with five flagellomeres. AR 0.82. Temporal setae 8, not separable into inner and outer verticals. Clypeus with 20 setae. Tentorium 75 µm long; 25 µm wide. Lengths of palpomere 1-5 (in µm): 38, 50, 105, 158, 250. Length ratio of palpomeres 5/3: 2.38.

Thorax (Fig. 2B ). Antepronotum with 9 anterolateral setae; acrostichals 28; dorsocentrals 17 in two rows; prealars 10. Scutellum with 46 setae.

Wing (Fig. 2A ). Brachiolum with 5 setae; wing membrane with macrotrichia on entire surface; costal extension 175 µm long. Distribution of setae on veins: R, 31; R1, 34; R4+5 3. Anal lobe well-developed; squama with 16 setae. VR 1.08.

Legs. Length (in µm) of spurs of: P1, 40; P2, 55 and 55; P3, 80 and 50. Width (in µm) of tibial apex of: P1, 60; P2, 70 µm; P3, 100. Comb on hind tibia with Comb of hind tibia with 12 setae. Lengths (in µm) and proportions of legs as in Table 2 .

Hypopygium (Fig. 2C ). Tergites IX without anal point. Tergites IX with 30 setae.

Gonocoxite 300 µm long. Superior volsella rounded, 60 µm long. Inferior volsella well-sclerotized, finger-like, bearing 17 setae. Gonostylus 140 µm long, with two small megasetae. HR 2.14; HV 2.11.

Genitalia of female

(N = 1) (Figs 3 , 4 ). Gonocoxite IX 100 µm long, 45 µm wide, with 7 setae. Cercus 88 μm long, 75 μm wide, with 47 setae and covered with macrotrichia. Seminal capsule 158 μm long, 75 μm wide, sclerotized part 98 μm long.

Figures

Figure 1. Boreoheptagyia kurobebrevis (Sasa & Okazawa, 1992), male adult in ethanol.

Figure 2. Boreoheptagyia kurobebrevis (Sasa & Okazawa, 1992), male adult A wing B thorax C hypopygium. Scale bars: 200 µm.

Figure 3. Boreoheptagyia kurobebrevis (Sasa & Okazawa, 1992), female adult.

Figure 4. Boreoheptagyia kurobebrevis (Sasa & Okazawa, 1992), female adult A genitalia with gonapophysis VIII and seminal capsules, ventral B cercus. Scale bars: 50 µm.