Orthocladius (Eudactylocladius) fengensis, 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 : 48

Orthocladius (Eudactylocladius) fengensis sp. n.

( Figs 4–6 )

Type material. Holotype male (BDN No. 04180), CHINA: Shannxi Province (subtropical mountain area), Feng County, Shuangshipu Town, 31.vii.1994, sweep net, W. Bu.

Diagnostic characters. The species can be separated from other members of the subgenus by having gonocoxite with week and short microtrichia and inferior volsella completely absent.

Etymology. Named after the type locality.

Description. Male (n = 1).

Total length 2.63 mm. Wing length 1.60 mm. Total length / wing length 1.64. Wing length / length of profemur 2.42.

Coloration. Head, antenna and abdomen brown. Thorax and legs yellowish brown.

Head. AR 1.09. Ultimate flagellomere 380 Μm long. Temporal setae 8, including 3 inner verticals, 1 outer vertical and 4 postorbitals. Clypeus with 10 setae. Cibarial pump, tentorium and stipes as in Fig. 4 . Tentorium 140 Μm long, 33 Μm wide. Stipes 128 Μm long, 48 Μm wide. Palpomere lengths (in Μm): 20, 42, 100, 98, 117. Length ratio of palpomeres 5/3 1.17.

Wing ( Fig. 5 ). Anal lobe well developed. VR 1.15. Costal extension 35 Μm long. R with 8 setae, other veins bare. Squama with 14 setae.

Thorax. Antepronotum with 8 setae. Dorsocentrals 11, acrostichals 4, prealars 3. Scutellum with 8 setae.

Legs. Spur of fore tibia 35 Μm, spurs of mid tibia 19 Μm and 18 Μm long, of hind tibia 51 Μm and 18 Μm long. Comb of 9 setae, shortest seta 22 Μm, longest seta 44 Μm. Width at apex of fore tibia 36 Μm, of mid tibia 31 Μm, of hind tibia 43 Μm. Pseudospurs present on ta1 and ta2 of mid and hind legs, 16–19 Μm long. Sensilla chaetica absent. Lengths (in Μm) and proportions of legs in Table 2.

Hypopygium ( Fig. 6 ). Tergite IX including anal point with 15 setae. Laterosternite IX with 8 setae. Anal point tapering to pointed apex, 40 μm long, 13 μm wide at base, covered with microtrichia except apical portion bare. Phallapodeme 68 Μm long, transverse sternapodeme 100 Μm long, oral projections well developed. Gonocoxite with week and short microtrichia, 198 Μm long, and inferior volsella completely absent. Gonostylus 80 Μm long, densely covered with microtrichia; crista dorsalis long and low. Megaseta 12 Μm long. HR 2.47, HV 3.28.

Figures

FIGURES 4 – 6. Orthocladius (Eudactylocladius) fengensis sp. n., 4 — tentorium, stipes and cibarial pump; 5 — wing; 6 — hypopygium.