Phyllomyza fuscusagenis, Xi & Zhu & Liu & Yang & Yin, 2023

Xi, Yuqiang, Zhu, Yongqiang, Liu, Chang, Yang, Ding & Yin, Xinming, 2023, Three new species of Phyllomyza Fallén (Diptera: Milichiidae) from Yintiaoling National Nature Reserve of Chongqing, with an updated key from China, Zootaxa 5257 (1), pp. 115-122 : 117-118

Phyllomyza fuscusagenis sp. nov.

( Figs 1, 2 , 7, 8 )

Diagnosis. Gena narrow, approximately one-tenth of eye height. Surstylus with upper blade of bifurcated tip extremely swollen, with apical margin blunt, the lower one thin and longer than upper one.

Description. Male. Body length 1.4–1.6 mm; wing length 1.4–1.6 mm.

Head brown with greyish microtomentum; orbital plate darkish brown with microtomentum, ocellar triangle darkish brown without microtomentum; lunule strap-shaped, brown with black margin. Posterior eye margin ventrally diverging from head margin; eye 1.5 times as high as long, gena approximately one-tenth of eye height. Setae and setulae on head black; ocellar triangle with 2 ocellar setae and 3 short setae; frons with 3 orbital and 2 frontal setae on brown orbital stripe, orbital setae lateroclinate and frontal setae medioclinate, 4 interfrontal setae; postocellar setae cruciate. Lunule with 2 setae. Vibrissal angle relatively blunt; vibrissa strong, located below the level of lower eye margin. Antenna brown with microtomentum; pedicel with short black setulae at middle and margin, setulae at margin longer than others, the longest one about 2.5 times longer than others; first flagellomere with pubescence, irregularly quadrate; arista 3 times as long as first flagellomere, black, distinctly pubescent. Proboscis slightly short and fold, darkish brown, with sparse setulae. Palpus short, with blunt tip in lateral view, about 0.4 mm, 3.5 times longer than wide; darkish brown with short dense black pubescence, margins with sparse setulae.

Thorax brownish with grey microtomentum except mesonotum shiny brownish with sparse black microtomentum; scutellum brownish with grey microtomentum. Setae and setulae on thorax black; 1 h, 2 dc, 1 prsc, 2 npl, 1 prs, 1 pos, 1 sa, 2 pa, 1 kepsts (a row of setulae at forward position); scutellum 1.5 times wider than long, with pair of asc and bsc, asc 3 times longer than bsc. Legs slender, coxae and femora darkish brown, tibiae yellow except hind tibiae brown with yellow apically, tarsi yellowish. Setae and setulae on legs black. Mid tibia with 1 black preapical dorsal seta. Wing hyaline, veins brown; M 1 between r-m and dm-cu a little longer than dm-cu. Calypter yellowish, with dense blackish microtrichae, margin with thin and long setulae. Knob of halter brownish, stalk brownish.

Abdomen brown with grey microtomentum. Setae and setulae on abdomen black; T2-T5 with setae, marginal setae longer than others; sternites with sparse setulae at posterior 3/4. Posteromedial triangular projection of T1 into T2 strong; S2 irregularly horseshoe-shaped and apex blunt and round, S3 generally trapezoid, apical margin slightly wider than basal margin, S4 horizontal rectangular, basal margin smooth, S5 horizontal trapezoid, apical margin flat. Male genitalia: epandrium with 7 strong black setae; surstylus with upper blade of bifurcated tip extremely swollen, with apical margin blunt, the lower one thin and longer than upper one; cercus arched with longer ventral appendix, with short sparse setae.

Female. Unknown.

Type material. HOLOTYPE male, CHINA, Chongqing, Yintiaoling Nature Reserve, Mt. Guanshan, Maizitang , 2168 m, 31°28′N 109°47′E, 2022. VIII. 17, Xulong Chen . PARATYPES: 2 males, Yintiaoling Nature Reserve , Lanying Grand Canyon, 875 m, 31°26′N 109°50′E, 2022. VIII. 13, Xulong Chen.

Distribution. China (Chongqing)

Etymology. The specific epithet refers to the colour of gena.

Remarks. This new species is distinctly different from other species of this genus in the hind tibia brown with yellow apex; the relatively longer palpus.

Figures

FIGURES 1–6. Head (male, lateral view) and wing (male). 1–2, Phyllomyza fuscusagenis sp. nov.; 3–4, Phyllomyza hirtipes sp. nov.; 5–6, Phyllomyza obtusus sp. nov. Scale bars = 0.1 mm.

FIGURES 7–12. Male epandrium, cercus, and surstylus, posterior view and lateral view. 7, Phyllomyza fuscusagenis sp. nov., posterior view; 8, Phyllomyza fuscusagenis sp. nov., lateral view; 9, Phyllomyza hirtipes sp. nov., posterior view; 10, Phyllomyza hirtipes sp. nov., lateral view; 11, Phyllomyza obtusus sp. nov., posterior view; 12, Phyllomyza obtusus sp. nov., lateral view. Scale bars = 0.1 mm.