Orthocladius (Eudactylocladius) brevis, Kong, Fanqing, Saether, Ole A. & Wang, Xinhua, 2012

Kong, Fanqing, Saether, Ole A. & Wang, Xinhua, 2012, A review of the subgenus Eudactylocladius (Diptera: Chironomidae) from China, Zootaxa 3341, pp. 46-53 : 46-48

Orthocladius (Eudactylocladius) brevis sp. n.

( Figs 1–3 )

Type material. Holotype male (BDN No. 11196), CHINA: Yunnan Province (subtropical area), Dali City, Diancang Mountain, Qingbi Stream, 23.v.1996, light trap, B. Wang. Paratype: 1 male, as holotype.

Diagnostic characters. The species can be separated from other members of the subgenus by having low AR (0.43–0.46), and the gonostylus widest medially.

Etymology. From Latin, brevis , short, referring to the short ultimate flagellomere of the antenna.

Description. Male (n = 2).

Total length 2.65–3.23 mm. Wing length 1.68–1.95 mm. Total length / wing length 1.57–1.65. Wing length / length of profemur 2.79–2.91.

Coloration. Head and thorax brown. Antenna, legs and abdomen yellowish brown.

Head. AR 0.43–0.46. Ultimate flagellomere short, 189–235 Μm. Temporal setae 8–11, including 1–3 inner verticals, 3–5 outer verticals and 3–4 postorbitals. Clypeus with 9–10 setae. Cibarial pump, tentorium and stipes as in Fig. 1 . Tentorium 127–132 Μm long, 26 m wide. Stipes 103–110 Μm long, 30–36 Μm wide. Palpomere lengths (in Μm): 20–26, 44–47, 75, 57–70, 110–118. Length ratio of palpomeres 5/3 1.47–1.57.

Wing ( Fig. 2 ). Anal lobe moderately developed. VR 1.11–1.13. Costal extension 30–40 Μm long. R with 6–9 setae, R1 with 1 seta, R4+5 with 1 seta. Squama with 11–12 setae.

Thorax. Antepronotum with 4–5 setae. Dorsocentrals 9–16, acrostichals 4–8, prealars 4–5. Scutellum with 7–10 setae.

Legs. Spur of fore tibia 27–30 Μm, spurs of mid tibia 18–23 Μm and 17–20 Μm long, of hind tibia 37–44 Μm and 20–21 Μm long. Comb of 9–10 setae, shortest seta 18–20 Μm, longest seta 33–35 Μm. Width at apex of fore tibia 31–35 Μm, of mid tibia 30–34 Μm, of hind tibia 37–40 Μm. Pseudospurs present on ta1 and ta2 of mid and hind legs, 15–18 m long. Sensilla chaetica absent. Lengths (in Μm) and proportions of legs in Table 1 .

Hypopygium ( Fig. 3 ). Tergite IX including anal point with 4–6 setae. Laterosternite IX with 5–7 setae. Anal point long, slender, nearly parallel-sided, covered with microtrichia except apical portion, without lateral setae, 36–40 Μm long, 13–14 Μm wide. Phallapodeme 58–62 Μm long, transverse sternapodeme 115–125 Μm long, oral projections well developed. Gonocoxite with week and short microtrichia, 163–200 Μm long. Gonostylus 95–98 Μm long, widest medially, with some scattered setae; crista dorsalis long and low. Megaseta 10 Μm long. HR 1.72–2.04, HV 2.78–3.29.

Figures

FIGURES 1 – 3. Orthocladius (Eudactylocladius) brevis sp. n., 1 — tentorium, stipes and cibarial pump; 2 — wing; 3 — hypopygium.

Tables

TABLE 1. Lengths (in µm) and proportions of legs segments of male O. (E.) brevis sp. n. (n = 2)

fe ti p1 600–670 720–820	ta1 440–490	ta2 310–350	ta3 180–220	ta4 120–150
p2 610–710 600–720	260–320	170–210	120–140	80–90
p3 660–790 730–850	390–450	230–270	180–200	110
ta5 LR	BV	SV	BR