Zavrelia bragremia Guo & Wang, 2007

Lin, Xiao-Long & Wang, Xin-Hua, 2017, A REDESCRIPTION OF ZAVRELIA BRAGREMIA GUO & WANG, 2007 (DIPTERA: CHIRONOMIDAE) Abstract, CHIRONOMUS Journal of Chironomidae Research 30, pp. 67-71 : 67-69

Zavrelia bragremia Guo & Wang, 2007

( Figs 1–10 )

Zavrelia bragremia Guo & Wang, 2007: 318 , figs 1–3. Holotype ♂ (BDN: 5486), China, Sichuan Province, Emeishan City , 29.60°N, 103.48°E, 17.v.1986, XH Wang.

Additional examined specimens. 8♂♂ (BDN: G5A49, G5A53–56, G5A69; NTNU-VM: G5A4 , G5A7), China, Zhejiang Province, Jinhua City, Pan’an County, Dapanshan National Nature Reserve , Huaxi Village , near a stream, 28.792°N, 120.525°E, 800 m a.s.l., 17–21.vii.2012, light trap, XL Lin .

Diagnosis

The adult male of Zavrelia bragremia can be distinguished from known species of Zavrelia by the following combination of characters: wing length 0.88–1.04 mm; AR 0.91–1.08; frontal tubercle minute; LR 1 about 2.09; laterosternite without seta; anal point with small spinulae between the anal crests at base, but without microtrichia; setiger of superior volsella without conspicuous constriction in apical 1/3.

Description

Adult male (n = 5, unless otherwise stated). Total length 1.24–1.34, 1.29 mm. Wing length 0.88–1.04, 0.95 mm. Total length/wing length 1.31–1.52, 1.38.

Colouration. Head capsule and mouthparts light brown, antenna and eyes dark brown to black. Thorax ground colour brown with dark brown stripes anteriorly on scutum, laterally under parapsidal suture, postnotum and on preepisternum, scutellum paler; legs and abdomen brown.

Head ( Figs 1–2 ). Antenna ( Fig. 1 ) with 10 flagellomeres, ultimate flagellomere 260–295, 278 μm long. AR 0.91–1.08, 0.98. Frontal tubercles minute, 3–4, 3 μm long, 3–4, 3 μm wide at base. Eye ( Fig. 2 ) hairy, reniform, without dorsomedial extension. Temporal setae 5–6, 5. Clypeus with 8–10, 9 setae. Tentorium 88–98, 93 μm long, 8–15, 12 μm wide. Palpomere lengths (in μm): 20–27, 23; 25–30, 27; 65–75, 68; 78–83, 81; 110–120, 115. Third palpomere with one sensillum clavatum distally.

Thorax chaetotaxy ( Fig. 3 ). Acrostichals 6 (n = 4); dorsocentrals 5–6, 6; humerals 0; prealars 1–2, 1; scuttellars 4; haltere with 3–6, 4 setae.

Wing ( Fig. 4 ). VR 1.21–1.35, 1.28. Brachiolum with one seta, Sc bare, R with 17–25, 20 setae, R 1 with 16–20, 17 setae, R 4+5 with 15–20, 17 setae, M 1+2 with 40–53, 47 setae, M 3+4 with 14–18, 16 setae, false vein with 78–86, 81 setae, Cu with 14–17, 16 setae, Cu 1 with 10–12, 11 setae, PCu with 36–43, 40 setae, An with 17–18, 18 setae, remaining veins bare. Cell r 4+5 with c. 190–210, 201 setae, m with 3–8, 5 setae, m 1+2 with c. 180–200, 190 setae, m 3+4 with 62–80, 71 setae, cu+an with 85–100, 91 setae, remaining cells bare. Anal lobe strongly reduced.

Legs. Fore leg bearing single tibial spur, 10–18, 14 μm long. Combs of mid tibia 13–18, 15 μm wide with 13–15, 14 μm long spur, and 11–13, 12 μm wide with 10–13, 12 μm long spur; combs of hind tibia 15–20, 17 μm wide with 15–20, 18 μm long spur, 15–18, 17 μm wide with 10–15, 13 μm long spur. Sensilla chaetica on basitarsus of mid leg absent. Lengths (in μm) and proportions of legs as in Table 1 .

Abdomen ( Figs 5–6 ). Setation see Figs 5–6 .

Hypopygium ( Figs 7–10 ). Laterosternite IX without seta. Anal tergite 56–68, 62 μm long, with 3–7, 5 median setae, 16–20, 18 apical setae. Anal point well developed, 17–20, 19 μm long, with 17–30, 23 small spinules scattered between anal crests at base, apex rounded; no microtrichia free area around base of anal point. Transverse sternapodeme 30–41, 37 μm long, without oral projections. Phallapodeme 45–75, 59 μm long. Superior volsella broadly digitiform with pointed apex, bearing two anteromedian and 3–5, 4 dorsal setae; microtrichia apparently absent. Median volsella ( Fig. 10 ) short, knob-shaped, with 3–4, 4 medially directed simple and subulate lamellae. Inferior volsella slightly curved, 45–55, 51 μm long, bearing 6–9, 7 setae in distal part. Gonocoxite 65–73, 70 μm long. Gonostylus 38–45, 41 μm long, curved inwards, broadest at middle, tapering to narrowly rounded apex. HR 1.55–1.83, 1.67, HV 2.62–3.35, 3.03.

Immature stages and adult females. Unknown.

Figures

Figures 1–2. Zavrelia bragremia Guo & Wang, 2007, male. 1, head and antenna, scale = 100 μm; 2, eye, scale = 50 μm.

Figures 3–6. Zavrelia bragremia Guo & Wang, 2007, male. 3, thorax; 4, wing; 5, abdomen, dorsal view; 6, abdomen, ventral view. Scales = 100 μm.

Figures 7–10. Zavrelia bragremia Guo & Wang, 2007, male. 7, holotype hypopygium, dorsal view; 8, hypopygium (BDN: G5A69), dorsal view; 9, hypopygium (BDN: G5A53), dorsal view; 10, median volsellae. Scales = 50 μm.