Hayesomyia galbina, 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 : 43-45

Hayesomyia galbina sp. n. ( Figs. 14–18 )

Type material

Holotype male, short antennal morph (BDN No.01442), CHINA: Hainan Province, Changjiang County, Bawangling Natural Conversation, 1042 m, 11.V.1988, light trap, X. H. Wang. Paratypes: 1 male, long antennal morph (BDN No.1438), same data as holotype.

Etymology

The species name is from Latin galbinus, yellow, referring to the color of the body.

Male imago (n = 2)

Dimensions. Total length 3.17–3.2 mm. Wing length 1.59–1.62 mm. Total length/wing length 1.96–2.01. Wing length/length of profemur 2.05–2.12.

Coloration. Head yellow. Ground color of thorax yellow, brown pigmentation confined to narrow band on anteanepisternum II along anapleural suture, 1/2 of median anepisternum II, 3 areas of scutum, top of posterior anepisternum II, and posterior 1/3 of postnotum ( Fig. 14 ). Tergites I–VI entirely yellow; tergites VII–VIII yellow with some pigment ( Fig. 15 ). Hypopygium yellow. Legs yellow. Wings with pigmented marking at humeral vein ( Fig. 17 ).

Head. Antennae dimorphic. Long antennal morph with AR 1.43. Short antennal morph with 11 flagellomeres, low antennal ratio, and setae of flagellum reduced in number ( Fig. 16 ). Temporal setae 14; including 8–10 verticals and 4–6 postorbitals. Clypeus with 22–25 setae. Tentorium 88–93 µm long, 13–20 µm wide. Palpomere 1–5 lengths (µm): 50–55; 65–70; 100–145; 155–165; 120–190.

Wing ( Fig. 17 ). VR 0.88–0.93. Brachiolum with 2 long setae. Squama with 22–24 setae.

Thorax. Antepronotal setae 4; dorsocentrals 13–31; acrostichals 16–18; prescutellars 1–2; supraalars 2; prealars 8–9; scutellars 7–10.

Legs. Spur on fore tibia 35–43 µm long with 5 lateral teeth. Spurs on mid tibia 38–48 and 45–53 µm long with 6 lateral teeth. Spurs on hind tibia 38–40 and 63–73 µm long with 8 lateral teeth. Tibial comb on hind leg of 6 setae. Lengths (µm) and proportions of legs as in Table 4 .

Hypopygium ( Fig. 18 ). Tergite IX with irregular slightly concave row of 10 or 11 setae. Gonocoxite 125–133 µm long. Gonostylus 110–148µm long. Median volsella 25–45 µm long, 28–30 µm wide. HR 0.85–1.20. HV 2.15–2.91.

Diganosis

This new species differs from other known species of the genus by the unique body coloration. Antennal dimorphism is present, a condition previously found in a Chinese species of Trissopelopia ( Cheng and Wang 2005) and a Nearctic species of Oliveridia ( Oliver 1983) . As in the female, the shape of the dorsomedial eye extension in specimens with female­like antennae is noticeably broader. The present new species is similar to H. trina sp. n. in having antennal dimorphism, but its wing has one marking ( Fig. 17 ), whereas the wing of H. trina sp. n. has three distinct pigmented areas ( Fig. 30 ). In addition, the present new species differs from H. trina sp. n. by its overall yellowish body color.

Figures

FIGURES 14 – 18. Hayesomyia galbina sp. n. male imago. 14, thorax. 15, abdomen. 16, femalelike antenna probably from intersex specimen. 17, wing. 18, hypopygium.

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 4. Lengths (µm) and proportions of legs of H. galbina sp. n.

	fe	ti	ta1	ta2	ta3	ta4	ta5	LR
p1	750–790	910–990	720–740	370–400	240–260	170–190	100–110	0.73–0.81
p2	740–810	810–890	570–620	220–280	180–210	150	90–100	0.70
p3	720–830	1030–1090	820–820	410–460	330–340	200–210	115–120	0.75–0.80