Orthocladius (Euorthocladius) flectus, Kong & A.Saether & Wang, 2012

Kong, Fanqing, A. Saether, Ole & Wang, Xinhua, 2012, A review of the subgenera Euorthocladius and Orthocladius s. str. from China (Diptera: Chironomidae), Zootaxa 3537, pp. 76-88 : 78

Orthocladius (Euorthocladius) flectus sp. n.

( Figs 4–6)

Type material. Holotype male (BDN No. 19999), CHINA: Shannxi Province , Feng County, Qinling Mountain, 10.vi.1998, sweep net, L. Yang . Paratypes: 2 males, as holotype.

Diagnostic characters. The species can be separated from other members of the subgenus by having superior volsella widely triangular with rounded apex, gonostylus bent, and crista dorsalis well developed.

Etymology. From Latin, flectus , bent, referring to the bent gonostylus.

Description. Male (n = 3).

Total length 3.70–4.35 mm. Wing length 2.33–2.80 mm. Total length / wing length 1.55–1.59. Wing length / length of profemur 2.77–2.89.

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

Head. AR 1.90–2.00. Ultimate flagellomere 760–900 µm long. Temporal setae 11–18, including 2 inner verticals, 5–7 outer verticals and 4–9 postorbitals. Clypeus with 10–13 setae. Cibarial pump, tentorium and stipes as in Fig. 4. Tentorium 154–163 µm long, 53–55 µm wide. Stipes 128–147 µm long, 52–55 µm wide. Palpomere lengths (in m): 31–35, 75–84, 158–163, 97–99, 170–176. Length ratio of palpomeres 5/3 1.04–1.11.

Wing ( Fig. 5). Anal lobe moderately developed. VR 1.02–1.05. Costal extension 30–40 µm long. R with 10–11 setae, other veins bare. Squama with 13–20 setae.

Thorax. Antepronotum with 3–4 setae. Dorsocentrals 12–13, acrostichals 4–5, prealars 3–5. Scutellars 16–22, biserial.

Legs. Spur of fore tibia 62–70 µm long, spurs of mid tibia 26–35 µm and 25–31 µm long; of hind tibia 62– 66 µm and 20–22 µm long. Comb of 10–12 setae, shortest seta 26–30 µm, longest seta 48–54 mm. Width at apex of fore tibia 44–50 µm, of mid tibia 42–48 µm, of hind tibia 47–55 µm. Pseudospurs present on ta 1 and ta 2 of mid and hind leg, 20–26 µm long. Sensilla chaetica absent. Lengths (in µm) and proportions of legs in Table 2.

Hypopygium ( Fig. 6). Tergite IX including anal point with 10–14 setae. Laterosternite IX with 8–10 setae. Anal point 57–67 µm long, 27–35 µm wide. Phallapodeme 88–102 µm long; transverse sternapodeme 125–128 µm long, oral projections well developed. Gonocoxite 225–267 µm long, superior volsella widely triangular with rounded apex, inferior volsella with ventral part slightly extended below the dorsal part. Virga 30 µm long. Gonostylus curved, 118–137 µm long; crista dorsalis well developed; megaseta 10–11 µm long. HR 1.91–1.95, HV 3.14–3.18.