Saetheria separata, Yan, Chuncai, Saether, Ole A. & Wang, Xinhua, 2011

Yan, Chuncai, Saether, Ole A. & Wang, Xinhua, 2011, Saetheria Jackson from the Sino-Indian Region (Diptera: Chironomidae), Zootaxa 3040, pp. 34-42 : 39-40

Saetheria separata sp. n.

( Figs. 9–11 )

Type material. Holotype male (BDN no. 1258), China: Hainan Province: Lingshui County, Diaoluo Town, 20.v.1980, light trap, X. Wang. Paratypes: 1 male (BDN no. 1294), data as for holotype; 1 male (BDN no. 05230), Hainan Province, Xinglong County, Huaqiao Farm, sweep net, X. Wang.

Diagnostic characters. The new species differs from other Saetheria species by the foot-shaped dorsal lobe of the superior volsella, bearing 1 median seta and microtrichia in inner half, the ventral lobe swollen distally, with 1 apical seta and microtrichia, and the parallel-sided gonostylus.

Etymology. From Latin separo, in reference to the separated anal tergite bands.

Description. Male (n = 3).

Total length 2.88–3.03, 2.97 mm. Wing length 1.15–1.20, 1.18 mm. Total length / wing length 2.44–2.63, 2.52. Wing length / length of profemur 2.05–2.14, 2.09.

Coloration. Thorax yellowish brown with dark brown vittae; posterior 1/3 of postnotum dark brown; femur and tibia of front leg yellowish green except distal 1/10 dark brown, tarsomere 1 yellowish brown, tarsomeres 2–5 dark brown; femur and tibia of mid and hind leg yellowish green, tarsomeres 1–4 yellowish brown, tarsomere 5 dark brown. Abdomen with tergite I yellowish green, tergites II–VI yellowish brown with dark brown bands distally, tergites VII–VIII and hypopygium dark brown.

Head. AR 1.78–1.95, 1.88; ultimate flagellomere 430–480, 450 Μm long. Frontal tubercles conical, 8–10, 9 Μm long; 5–10, 7 Μm wide at base. Temporal setae 10–11, 10, including 2–3, 3 inner verticals, 3–4, 3 outer verticals, and 3–5, 4 postorbitals. Clypeus with 11–14, 12 setae. Tentorium 108–130, 118 Μm long, 23–30, 26 Μm wide. Palpomere lengths (in Μm): 30–33, 31; 35–42, 37; 97–105, 102; 118–128, 124; 145–163, 154. Palpomere 5/3 ratio 1.49–1.58, 1.54.

Thorax. Antepronotals 3–7, 5; acrostichals 6–11, 9; dorsocentrals 7–8, 8; prealars 3–5, 4. Scutellum with 7–10, 9 setae.

Wing ( Fig. 9 ). VR 1.24–1.25, 1.25. R with 3–5, 4, R1 bare, R4+5 with 2 setae apically. Brachiolum with 1 seta. Squama with 4–5, 4 setae.

Legs. Fore tibia with 2 subapical setae, 60–65, 62 Μm and 70-78, 73 Μm long. Spurs of mid tibia 15 Μm and 16- 20, 18 Μm long; comb with 26–30, 28 teeth, 8 Μm long. Spurs of hind tibia 18–20, 19 Μm and 23–30, 26 Μm long; comb with 30–42, 37 teeth, 8 Μm long. Tarsomere 1 of mid leg with 3–5, 4 sensilla chaetica; tarsomere 1 of hind leg without sensilla chaetica. Lengths and proportions of legs as in Table 3.

fe ti ta1 ta2 ta3 ta4 ta5 p1 550–580, 563 360–390, 380 650–690, 667 340–350, 343 250–290, 263 170 100 p2 500–510, 507 420–450, 437 230–240, 237 120–125, 122 80 50–55, 53 40–50, 47 p3 560–580,570 570–590, 577 370 200–210, 207 170–190, 180 100–110,105 70–80, 73

continued.

LR BV BR SV p1 1.69–1.81, 1.76 1.75–1.91, 1.81 4.38–4.56, 4.47 1.40–1.41, 1.41 p2 0.53–0.55, 0.54 3.73–4.02, 3.94 4.02–4.11, 4.07 3.99–4.00, 4.00 p3 0.63–0.66, 0.64 2.57–2.85, 2.78 3.98–4.06, 4.03 3.06–3.17, 3.12 Hypopygium ( Figs.10–11 ). Tergite IX with 18 setae at base of anal point; laterosternite IX with 1–4, 2 setae. Anal point constricted at base, swollen apically, 30–37, 34 Μm long; 13–16, 15 Μm wide at middle. Anal tergite bands V-shaped, separated medially. Phallapodeme 58–75, 68 Μm long. Transverse sternapodeme 63–73, 67 Μm long. Superior volsella composed of dorsal and ventral lobes, dorsal lobe foot-shaped, with a sclerotized ridge medially, covered with microtrichia in inner half, bearing 1 seta medially. Ventral lobe thumb-shaped, covered with microtrichia and with 1 apical seta. Inferior volsella with rounded upper apex and covered with microtrichia. Gonocoxite 85–148, 119 Μm long, with 3–4, 4 strong setae along inner margin. Gonostylus 140–155, 148 Μm long, with parallel-sided margin. HR 0.61–0.95, 0.80, HV 1.92–2.16, 2.01.

Remarks. According to Jackson (1977) and Cranston et al. (1989), the genus Saetheria has Y-shaped anal tergite bands, however, this new species has V-shaped anal tergite bands that are separated medially. Thus, the Yshaped anal tergite bands can not be regarded as a definitive diagnostic character for Saetheria .

Figures

FIGURES 9 – 11. Saetheria separata sp. n. male. 9. wing; 10. hypopygium, dorsal view; 11. hypopygium, ventral view.