Kiefferulus trigonum, Song & Wang & Bu & Qi, 2020

Song, Chao, Wang, Xinhua, Bu, Wenjun & Qi, Xin, 2020, Morphology lies: a case-in-point with a new non-biting midge species from Oriental China (Diptera, Chironomidae), ZooKeys 909, pp. 67-77 : 67

Kiefferulus trigonum sp. nov. Figs 2 , 3, BIN: ADG9680

Type material.

Holotype (BDN No. 041685) 1♂, China, Fujian Province：Longyan City, Shanghang County, Buyun Town, Qiushan, 25.03N, 116.24E, 6.V.1993, Wang XH, light trap. Paratypes: 1♂ same as holotype; 3♂, Fujian Province: Sanming City, Jianning County, 25. IX.2002, Liu Z, light trap; 1♂, Guangxi Zhuang Autonomous Region: Nanning City, 9. V.1986, Wang XH; 2♂, Guizhou Province: Libo County, 7.VIII.1995, Bu WJ, light trap; 1♂, Hainan Province: Ledong City, Jianfengling National Forest Park, Song C, light trap.

Etymology.

From Latin, trigonum means triangle, referring to the triangular tergite IX.

Diagnostic characters.

The male adults could be obviously distinguished from other Kiefferulus species by the triangular IX tergite, superior volsella with projection and basal part of inferior volsella wider than distal part.

Description.

Male imago (N = 9). Total length 4.78-5.90, 5.30 mm; wing length 2.13-2.85, 2.46 mm; total length/ wing length 1.95-2.38, 2.16; wing length / length of profemur 1.98-2.33, 2.12.

Coloration. Head, thorax and abdomen brown, legs yellowish except distal fore femur and tarsus I light brown.

Head. Frontal tubercle absent. AR 3.07-3.69, 3.25. Temporal setae 15-25, 20; Clypeus with 20-33, 26 setae;

Palpomere lengths (in μm): 38-55; 47; 115-153, 128; 123-163,141; 170-245, 208. Length of 5th palpomere / 3rd palpomere 1.42-2.04, 1.61.

Wing (Fig. 2A ) VR 1.07-1.14, 1.10; Brachiolum with 2-3 setae; R with 20-29, 25 setae; R1 with 13-21, 17 setae; R4+5 with 12-18, 15 setae; squama with 9-19, 15 setae. Anal lobe developed.

Thorax. Dorsocentrals 8-13, 12; acorstichals 20-28, 23; prealars 5-7, 6; scutellum 10-18, 12 setae.

Legs. Tarsomere 1 of Mid and hind leg with 9-20, 14 and 6-17, 10 sensilla chaetica respectively. Front scale bluntly rounded; Spurs of mid tibia 23-38, 29 μm, and 25-33, 29 μm long, of hind tibia 28-38, 32 μm, and 25-35, 29 μm. Width at apex of front tibia 75-98, 85 μm, of mid tibia 83-95, 89 μm, of hind tibia 90-110, 98 μm. Lengths and proportions of legs as the Table 1 .

Hypopygium (Figs 2B-D , 3 ). Anal tergite bands medially fused, and median anal tergite seta absent. Anal point basically narrow and apically broaden. Superior volsella with pad-like microchichiose and setose base, with long finger like projection inward to the apex of anal point. Inferior volsella slender, with strong distal setae. Gonocoxite 270-310, 293 μm long, gonostylus 180-210, 198 μm, with numerous distal microtrichia. Phallapodeme 220-250, 232 μm; transverse sternapodeme 100-113, 108 μm. HR 1.42-1.61, 1.49; HV 1.95-2.88, 2.59.

Larva and female unknown.

Distribution.

Fujian Province, Guizhou Province, Guangxi Zhuang Autonomous Region, and Hainan Province (Oriental China).

Figures

Figure 2. Kiefferulus trigonum sp. nov. male A wing B hypopygium in dorsal view C anal point and base of superior volsella D projection of superior volsella.

Figure 3. Kiefferulus trigonum sp. nov. male A hypopygium in dorsal view B hypopygium in ventral view.