Hayesomyia trina, 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 : 50-53

Hayesomyia trina sp. n. ( Figs. 27–31 )

Type material

Holotype male (BDN No.10755), Yunnan Province, Zhongdian County, Hutiaoxia, 1602 m, 26.V.1996, light trap, X. H. Wang. Paratypes: 1 male (BDN No. 10949) same data as holotype; 1 male (BDN No.11143), Yunnan Province, Dali City, Yinqiao Town, 2000 m, 21.V.1996, sweep net, X. H. Wang; 1 male (BDN No.13032), CHINA: Sichuan Province, Baoxin County, Xinglong Township, Xihe River, 1100 m, 19.VI.1996, light trap, X. H. Wang; 1 male (BDN No.11265), Yunnan Province, Dali City, Diancangshan Mountain, Qingbixi, 2370 m, 23.V.1996, light trap, Y. Z. Du.

Etymology

The species name is from Latin trinus, three, referring to tergites II–III, each with three brown spots.

Male imago (n = 5)

Dimensions. Total length 2.8–3.68, 3.09 mm. Wing length 1.95–2.25, 2.09 mm. Total length/wing length 1.33–1.88, 1.48. Wing length/length of profemur 2.16–2.53, 2.34.

Coloration. Head brown. Ground color of thorax brown, darker brown pigmentation confined to narrow band on anteanepisternum II along anapleural suture, 1/3 of preepisternum, 1/2 of median anepisternum II, 4 areas of scutum and posterior 2/3 of postnotum ( Fig 27 ). Ground color of abdomen pale yellow, tergites II–III each with 3 spots; tergites IV–VI each with brown spot in middle; tergite VII brown on distal 2/3; tergite VIII entirely brown; hypopygium pale yellow.( Fig. 28 )Legs pale with apical brown rings on femora. Wings with 3 distinct pigmented areas, 1 at humeral vein, 1 along crossveins r­m and m­cu and 1 in cell m3+4 ( Fig. 30 ).

Head. Antennae dimorphic. Long antennal morph with AR 1.07 (BDN No.10755). Short antennal morph (BDN No.11143, No.11265, and No.13032) with 11 flagellomeres, low antennal ratio, and setae of flagellum reduced in number. (Antennae of specimen No.10949 were lost). Temporal setae 14–16, 15; including 10–12, 11 verticals and 4–6, 4 postorbitals. Clypeus with 16–26, 18 setae. Tentorium 90–195, 122 µm long, 25–45, 35 µm wide. Palpomere 1–5 lengths (µm): 48–60, 53; 83–88, 85; 143–175, 163; 178–208, 192; 270–320, 294.

Wing ( Fig. 30 ). VR 0.84–0.92, 0.89. Brachiolum with 2–3, 2 long setae. Squama with 25–32, 28 setae.

Thorax. Antepronotal setae 4; dorsocentrals 20–32, 28; acrostichals 19–22, 21; prescutellars 2; supraalars 2;prealars 9–14, 12; scutellars 11–30, 19.

Legs. Spur on fore tibia 43–53, 47 µm long with 6 lateral teeth. Spurs on mid tibia 43–55, 50 and 53–63, 59 µm long with 7 and 6 lateral teeth. Spurs on hind tibia 40–48, 46 and 70–88, 79 µm long with 5 and 6 lateral teeth, respectively. Tibial comb on hind leg with 5 setae. Length (µm) and proportions of legs as in Table 7 .

Hypopygium ( Fig. 31 ). Tergite IX with irregular slightly concave row of 6–12, 10 setae. Gonocoxite 163–193, 182 µm long. Gonostylus 150–175, 161µm long. Median volsella 23–38, 31 µm long, 25–45, 32 µm wide. HR 1.04–1.28, 1.13. HV 1.74–2.1, 1.92.

Diagnosis

This new species differs from other known species of the genus Hayesomyia by the characteristic color pattern of the male abdomen. It shows antennal dimorphism. As in the female, the shape of the dorsomedial eye extension in those specimens with female­like antenna is noticeably broader. It shares this character with H. galbina sp. n, but differs from the latter in markings of the wing and body and in the presence of narrow brown rings on the femora.

Figures

FIGURES 27 – 31. Hayesomyia trina sp. n. male imago. 27, thorax. 28, abdomen. 29, female­like antenna probably from intersex specimen. 30, wing. 31, hypopygium.

Tables

TABLE 7. Lengths (µm) and proportions of legs of H. trina sp. n.

	fe	ti	ta1	ta2	ta3	ta4	ta5	LR
p 1	840–970 894	1025–1160 1102	890–1010 956	450–510 480	320–370 342	220–230 224	100–140 126	0.83–0.93 0.87
p 2	925–1025 976	950–1075 1005	630–690 658	220–320 290	210–240 226	150–180 170	90–110 103	0.63–0.68 0.65
p 3	825–910 874	1150–1300 1230	930–1040 975	510–570 528	370–420 394	190–290 246	120–130 126	0.76–0.84 0.79