Hayesomyia triangula, 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 : 48-50

Hayesomyia triangula sp. n. ( Figs.23–26 )

Male imago (n = 2)

Dimensions. Total length 3.35–3.95 mm. Wing length 1.58–2.08 mm. Total length/ wing length 1.90–2.12. Wing length/length of profemur 1.98–2.13.

Coloration. Head yellow. Ground color of thorax yellow, brown pigmentation confined to narrow band on anteanepisternum II along anapleural suture, 1/4 of median anepisternum II and anterior border of scutum ( Fig. 23 ). Tergites II–VI yellow, each with broad brown basal band; tergite VII–VIII entirely brown ( Fig. 24 ). Hypopygium brown. Wings without dark markings. ( Fig. 25 )

Head. AR 1.4. Temporal setae 14; including 10 verticals and 4 postorbitals. Clypeus with 26 setae. Tentorium 195 µm long, 50 µm wide. Palpomere 1–5 lengths (µm): 50; 88; 180; 200; 340. (Head of No. 24452 was lost).

Wing ( Fig. 25 ). VR 0.78–0.92. Brachiolum with 2 long setae. Squama with 20–28 setae.

Thorax. Antepronotal setae 4; dorsocentrals 18; acrostichals 20–21; prescutellars 2; supraalars 1–2; prealars 8–10; scutellars 9–12.

Legs. Spur on fore tibia 35–43 µm long with 5 lateral teeth. Spurs on mid tibia 45–48 and 53–58 µm long with 6 and 8 lateral teeth. Spurs on hind tibia 45–48 and 50–65 µm long with 6 lateral teeth. Tibial comb on hind leg with 5 setae. Lengths (µm) and proportions of legs as in Table 6 .

Hypopygium ( Fig. 26 ). Tergite IX with irregular row of 14–16 setae. Gonocoxite 168–188 µm long. Gonostylus 155–175µm long. Median volsella trianglular 23–23 µm long, 20–35 µm wide. HR 1.07–1.08. HV 2.16–2.26.

Diagnosis

This new species differs from other known species of the genus Hayesomyia in having a triangular median volsella, which is unique for the genus. All other known species have the median volsella bifurcate, or at least apically concave.

Figures

FIGURES 23 – 26. Hayesomyia triangula sp. n. male imago. 23, thorax. 24, abdomen. 25, wing. 26, hypopygium.

Tables

TABLE 6. Lengths (µm) and proportions of legs of H. triangula sp. n.

	fe	ti	ta1	ta2	ta3	ta4	ta5	LR
p1	800–975	980–1100	830–1000	420–500	310–310	210–250	120–140	0.85–0.91
p2	850–975	860–1025	530–670	240–300	190–240	160–180	90	0.62–0.65
p3	740–925	1075–1250	870–1000	460–510	350–370	220–250	130	0.80–0.81