Compterosmittia procera, Lin, Xiaolong, Yao, Yuanyuan, Liu, Wenbin & Wang, Xinhua, 2013

Lin, Xiaolong, Yao, Yuanyuan, Liu, Wenbin & Wang, Xinhua, 2013, A review of the genus Compterosmittia Saether, 1981 (Diptera: Chironomidae) from China, Zootaxa 3669 (2), pp. 129-138 : 134-136

Compterosmittia procera sp. n.

( Figs 13–17 )

Type material. Holotype male, (BDN No. A 13I90), China: Zhejiang Province, Hangzhou City, Changhua County, Qingliangfeng National Nature Reserve, 30°17’50’’N, 119°07’01’’E, 15.v.2012, 1100 m a.s.l., R. Guo, Malaise trap.

Diagnostic characters. The adult male of the new species can be distinguished from known species of the genus by having a slender acute anal point, pseudospurs on ta3 and ta4 of mid and hind legs, a bilobed inferior volsella and a flat megaseta not dentate.

Etymology: From Latin procerus, slender, referring to the slender anal point.

Description. Adult male (n = 1).

Total length 2.20 mm. Wing length 1.33 mm. Total length/wing length 1.66. Wing length/length of profemur 2.55.

Coloration. Head, thorax, leg and abdomen yellow.

Head. AR 0.75. Antenna with 13 flagellomeres, ultimate flagellomeres 285 μm long. Temporal setae 6, including 2 inner verticals; 3 outer verticals and 1 postorbital. Clypeus with 4 setae. Tentorium, stipes and cibarial pump as in Fig. 13 . Tentorium 115 μm long, 23 μm wide. Stipes 74 μm long, 11 μm wide. Palpomere lengths (in μm): 20, 35, 83, 70, 105. Length ratio of palpomeres 5/3 1.27.

Wing ( Fig. 14 ). Anal lobe reduced. VR 1.26. Costal extension 100 μm long. Brachiolum with 1 seta. All veins bare. Cu1 moderately sinuous. Squama bare.

Thorax ( Fig. 15 ). Antepronotum without seta. Dorsocentrals 6; acrostichals 12; prealars 2. Scutellum with 2 setae.

Legs. Spur of fore tibia 33 μm long; spurs of mid tibia 20 μm and 15 μm long; spurs of hind tibia 35 μm and 15 μm long. Hind tibial comb with 9 spines. Pseudospurs present on ta3 and ta4 of mid and hind legs, 10 and 13 μm long. Width of fore tibia at apex 23 Μm, of mid tibia 25 Μm, of hind tibia 25 Μm. Lengths (in μm) and proportions of legs as in Table 3 .

Hypopygium ( Figs 16–17 ). Anal point slender, with pointed apex, 53 μm long, 20 μm wide at base, with 8 strong lateral setae. Laterosernite IX with 3 setae. Phallapodeme 63 μm long. Transverse sternapodeme 65 μm long. Gonocoxite 140 μm long. Gonostylus 70 μm long. Megaseta 5 μm long, flat, not dentate. Inferior volsella composed of anterior bare lobe and posterior rounded lobe. Virga weak, inverted U-shaped. HR 2.00. HV 3.14.

Remarks. The new species resembles C. berui Mendes, Andersen et Saether, 2004 in the shape of the anal point, but it can be separated from the latter species on the basis of following characters: (1) pseudospurs present on mid and hind ta3, ta4 of C. procera , but absent in the latter species; (2) lower LR1 (0.72) in C. procera , whereas LR1 (0.87–0.94) higher in the latter species; (3) antepronotum of C. procera without seta, but seta(e) present in the latter species.

Female and immatures unknown.

Figures

FIGURES 13 – 17. Compterosmittia procera sp. n., male. 13 — cibarial pump, tentorium and stipes; 14 — wing; 15 — thorax; 16 — hypopygium, dorsal view; 17 — hypopygium, ventral view.

Tables

TABLE 3. Lengths (in μm) and proportions of legs of Compterosmittia procera sp. n. (n = 1).

	fe	ti	ta1	ta2	ta3	ta4	ta5	LR	BV	SV	BR
P1	520	570	410	220	138	75	65	0.72	3.01	2.66	1.50
P2	500	540	250	140	95	55	53	0.46	3.76	4.16	2.17
P3	570	640	370	200	150	65	60	0.58	3.33	3.27	1.83