Saetheria glabra, 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 : 37

Saetheria glabra sp. n.

( Figs. 4–8 )

Type material. Holotype male (BDN no. 1286), China: Shandong Province: Yantai City, Muping Town, Nanzhuang, 28.viii.1988, light trap, H. Li. Paratype: 1 male, data as for holotype.

Diagnostic characters. The new species is easily distinguished by having dark brown markings on abdomen, massive frontal tubercles, no setae on R1 and pediform superior volsella, composed of dorsal membranous bare lobe and setigerous ventral lobe with 1 apical seta.

Etymology. From Latin glabra , bare, referring to the bare dorsal lobe of the superior volsella.

Description. Male (n = 2).

Total length 2.23–2.46 mm. Wing length 1.20–1.23 mm.

Total length / wing length 86–2.00. Wing length / length of profemur 2.22–2.27.

Coloration. Thorax yellowish brown with posterior 1/5 of postnotum dark brown; femur of front leg yellowish green except distal 1/10 dark brown, tibia yellowish green, tarsus 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–V yellowish brown with dark brown bands distally, tergite VI dark brown except for basal 1/5 yellowish brown, tergites VII–VIII and hypopygium dark brown ( Fig. 4 ).

Head. AR 1.75, ultimate flagellomere 470–510 Μm long. Frontal tubercles swollen distally, 8–10 Μm long, 6–8 Μm wide. Temporal setae 10–16, including 4 inner verticals, 3–5 outer verticals, and 3–7 postorbitals. Clypeus with 9–11 setae. Tentorium 78–95 Μm long, 20–25 Μm wide. Palpomere lengths (in Μm): 27–28; 30; 80–95; 88–120; 145–155. Palpomere 5/3 ratio 1.53–1.54.

Thorax. Antepronotals 2–5, acrostichals 5–8 dorsocentrals 8, prealars 3. Scutellum with 4–7 setae.

Wing ( Fig. 5 ). VR 1.20. R with 2–4, R1 bare, R4+5 with 2 setae apically. Brachiolum with 1 seta. Squama with 3– 4 setae.

Legs. Fore tibia with 2 subapical setae, 76–80 Μm, another lost. Spurs of mid tibia 15 and 18 Μm long; comb with 22–30 teeth, 8–9 Μm long. Spurs of hind tibia 15–20 Μm and 23–25 Μm long; comb with 38–40 teeth, 8–10 Μm long. Tarsus 1 of mid leg with 1–5 sensilla chaetica, tarsus 1 of hind leg without sensilla chaetica. Lengths and proportions of legs as in Table 2.

fe ti ta1 ta2 ta3 ta4 ta5 p1 540 340 630–670 340 250 170 100 p2 470–500 420–460 210–240 120–145 70–95 50–65 50–60 p3 550–620 560–590 360–370 200–210 170–180 100–110 70–80

continued.

LR BV BR SV

p1 1.88–1.97 1.76–1.81 4.54–4.80 1.32–1.40 p2 0.46–0.57 3.30–3.72 3.89–4.02 4.00–4.24 p3 0.61–0.66 2.57–2.90 3.86–3.94 3.09–3.27 Hypopygium ( Figs. 6–8 ). Tergite IX with 2 median setae and 11 setae on base of anal point. Laterosternite IX with 1–2 setae. Anal point constricted basally, swollen distally, 35 Μm long, 13–16 Μm wide. Phallapodeme 42–53 Μm long. Transverse sternapodeme 43–50 Μm long. Superior volsella composed of dorsal and ventral lobes, dorsal lobe bare, ventral lobe with 1 apical seta and covered with microtrichia. Inferior volsella small, apex rounded and covered with microtrichia ( Fig. 8 ). Gonocoxite 78–87 Μm long, with 3 strong setae along inner margin. Gonostylus 120–133 Μm long, slender medially, swollen distally and with digitiform apex. HR 0.59–0.73, HV 1.68–2.05.

Figures

FIGURES 4 – 8. Saetheria glabra sp. n. male. 4. abdomen; 5. wing; 6. hypopygium, dorsal view; 7. hypopygium, ventral view; 8. superior volsella and inferior volsella.