Hayesomyia rotunda, Cheng, Ming & Wang, Xinhua, 2006

Cheng, Ming & Wang, Xinhua, 2006, Review of Hayesomyia Murray & Fittkau (Diptera: Chironomidae: Tanypodinae) from China, Zootaxa 1147, pp. 35-59 : 46-48

Hayesomyia rotunda sp. n. ( Figs. 19–22 )

Type material

Holotype male (BDN No.13310), CHINA: Sichuan Province, Xiangcheng County, Shuoquhe Rive, 2700 m, 12.VI.1996, light trap, X. H. Wang. Paratypes: 2 males (BDN No.09829, 09839) Yunnan Province, Eryuan County, Niujie Township, Futianlin, Meicihe, 2332 m, 23.V.1996, light trap, C. F. Zhou & B. X. Wang.

Male imago (n = 3)

Dimensions. Total length 2.78–3.38, 3.0 mm. Wing length 2.03–2.43, 2.20 mm. Total length/wing length 1.29–1.40, 1.36. Wing length/length of profemur 2.27–2.55 2.40.

Coloration. Head brown. Ground color of thorax brown, darker brown pigmentation confined to narrow band on anteanepisternum II along anapleural suture, basal 1/2 of preepisternum, 1/4 of median anepisternum II, 4 areas of scutum and anterior border of postnotum ( Fig 19 ). Ground color of abdomen pale brown; tergites II–VII each with brown rounded marking in middle and additional dark stripe along lateral margins; tergite VIII brown on basal 4/5 ( Fig. 20 ). Hypopygium pale brown. Legs pale with narrow brown ring at apex of femora. Wings with 3 distinct pigmented areas, 1 at humeral vein, 1 around crossveins r–m and m­cu and other at junction of R1 with costa ( Fig. 21 ).

Head. AR 1.30–1.73, 1.55. Temporal setae 14–18, 17; including 10–14, 13 verticals and 4 postorbitals. Clypeus with 21–28, 24 setae. Tentorium 143–163, 152 µm long, 28–48, 38 µm wide. Palpomere 1–5 lengths (µm): 30–60, 48; 80–100, 89; 130–143, 137; 180–190, 183; 283–300, 291.

Wing ( Fig. 21 ). VR 0.90–0.93, 0.92. Brachiolum with 2–3, 2 long setae. Squama with 28–30, 29 setae.

Thorax. Antepronotal setae 4; dorsocentrals 28–30, 29; acrostichals 16–20, 18; prescutellars 2; supraalars 2; prealars 9–14, 12; scutellars 12–20, 17.

Legs. Spur on fore tibia 38–48, 42 µm long with 6 lateral teeth. Spurs on mid tibia 45–48, 46 and 48–65, 56 µm long with 6 lateral teeth. Spurs on hind tibia 43–50, 46 and 75–80, 78 µm long with 5 and 7 lateral teeth respectively. Tibial comb on hind leg with 7 setae. Lengths (µm) and proportions of legs as in Table 5 .

Hypopygium ( Fig. 22 ). Tergite IX with irregular slightly concave row of 10–14, 12 setae. Gonocoxite 178–215 193 µm long. Gonostylus 148–155, 152 µm long. Median volsella 30–45, 38 µm long, 20–48, 36 µm wide. HR 1.20–1.39, 1.27. HV 1.79–2.21, 1.97.

Diagnosis

This new species differs from other known species of the genus Hayesomyia by the characteristic color pattern of the male abdomen and the wing markings.

Figures

FIGURES 19 – 22. Hayesomyia rotunda sp. n. male imago. 19, thorax. 20, abdomen. 21, wing. 22, hypopygium.

Tables

TABLE 5. Lengths (µm) and proportions of legs of H. rotunda sp. n.

	fe	ti	ta1	ta2	ta3	ta4	ta5	LR
p1	850–950 910	1050–1220 1132	875–1040 958	450–520 480	310–320 317	220–250 237	140–145 141	0.81–0.85 0.83
p2	900–1050 987	975–1050 1015	590–610 597	290–300 297	230–250 240	180–190 187	100–110 107	0.56–0.63 0.59
p3	800–1000 910	1050–1380 1250	875–1010 955	500–580 377	380–490 423	240–290 260	120–135 128	0.71–0.83 0.77