Phyllomyza obtususa, 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 : 121

Phyllomyza obtususa sp. nov.

( Figs 5, 6 , 11, 12 )

Diagnosis. Gena approximately one-tenth of eye height. Surstylus with upper blade of bifurcated tip swollen and apical margin flat and blunt, the lower blade slightly swollen and shorter than the upper one.

Description. Male. Body length 1.3–1.5 mm; wing length 1.2–1.5 mm.

Head darkish brown with greyish microtomentum; orbital plate shiny brown with microtomentum, ocellar triangle darkish brown without microtomentum; lunule strap-shaped, darkish brown with black margin. Posterior eye margin ventrally diverging from head margin; eye 1.4 times as high as long, gena approximately one-tenth of eye height. Setae and setulae on head black; ocellar triangle with 2 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 flat, approximately right-angle; vibrissa strong, located below level of lower eye margin. Antenna darkish brown with microtomentum; pedicel with black setulae at middle and margin, setulae at margin longer than others, the longest one about 3.5 times longer than others; first flagellomere with pubescence, irregularly circular; arista 3 times as long as first flagellomere, black, distinctly pubescent. Proboscis slender, greyish white at apical half part and the rest blackish, with sparse black setulae. Palpus flat with blunt apex in lateral view, 0.2 mm, 2 times as long as wide; darkish brown with short dense black pubescence, margin with short sparse setulae.

Thorax darkish brown with grey microtomentum except mesonotum shiny darkish brown with sparse black microtomentum; scutellum brown with grey microtomentum. Setae and setulae on thorax black; 1 h, 2 dc, 1 prsc, 2 npl, 1 prs, 1 pos, 1 sa, 1 pa, 1 ia, 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 brown except fore tibiae darkish yellow, 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 as long as dm-cu. Calypter yellowish, with dense brownish microtrichae, margin with brownish setulae. Knob of halter brown, stalk brownish.

Abdomen brown with grey microtomentum. Setae and setulae black; T2–T5 with long setae at posterior margin; sternites with sparse setulae. Posteromedial triangular projection of T1 into T2 weak; S2 generally horseshoeshaped, S3 vertical rectangular, S4 generally subquadrate, S5 slightly trapezoid, apical margin slightly wider than basal margin. Male genitalia: epandrium with strong black setae; upper blade of bifurcated tip of surstylus swollen and apical margin flat and blunt, the lower blade slightly swollen and shorter than the upper one; cercus arched with a little longer ventral appendix, with short sparse setae.

Female. Unknown.

Type material. HOLOTYPE male, CHINA, Chongqing, Yintiaoling Nature Reserve, Yezhuping , 1550 m, 31°28′N 109°49′E, 2022. VI. 22, Yuliang Guan & Rongzhen Xu. PARATYPES: 3 males, same data as holotype.

Distribution. China (Chongqing)

Etymology. The specific epithet refers to the blunt vibrissal angle.

Remarks. This species is similar to P. brevipalpis ( Hendel, 1919) , but can be separated by the gena approximately one-tenth of eye height; the M 1 between r-m and dm-cu as long as dm-cu. In P. brevipalpis , the gena is approximately one-fourth of eye height; the M 1 between r-m and dm-cu longer than dm-cu at least 1.5 times ( Hendel 1919).

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.