Phyllomyza ruiliiensis, Xi & Yin, 2018

Xi, Yuqiang & Yin, Xinming, 2018, Four new species of Phyllomyza Fallén (Diptera: Milichiidae), with an updated key from China, Zoological Systematics 43 (3), pp. 309-316 : 315-316

Phyllomyza ruiliiensis sp. nov. ( Figs 13–16 )

Diagnosis. This species is similar to P. cuspigera Xi & Yang , but can be separated easily from the latter by the gena approximately one-eleventh eye height; surstylus with upper blade of bifurcation tip extremely swollen, the lower one thin. In P.cuspigera , the gena approximately one-eighth eye height; surstylus with upper blade of bifurcation tip slightly swollen, the lower one sharp at tip (Xi & Yang, 2013).

Description. Male. Body length 1.5 mm; wing length 1.6 mm.

Head ( Fig. 13 ) black with grayish microtomentum; orbital plate subshiny black with microtomentum, ocellar triangle black without microtomentum; lunule strap-shaped, yellow with brownish yellow margin. Posterior eye margin ventrally diverging from head margin; eye 1.4 times as high as long, gena approximately one-eleventh 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 darkish brown 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 at the level of lower eye margin. Antenna blackish brown with microtomentum; pedicel with short black setulae at middle and margin, setulae at margin longer than others, longest one about 3 times longer than others; first flagellomere with pubescence, irregularly square; arista 3 times as long as first flagellomere, black, distinctly pubescent. Proboscis slightly short and folded, darkish yellow, margin with sparse setulae. Palpus wide and flat, base to apical gradually narrowed in lateral view, about 0.4 mm; yellowish brown with short dense black pubescence, margin with sparse short setulae.

Thorax darkish brown with grey microtomentum, except mesonotum shiny blackish brown with sparse black microtomentum; scutellum darkish brown with gray microtomentum. Setae and setulae on thorax black; 1 h, 2 dc, 1 prsc, 2 npl, 1 prs, 1 sa, 1 pa, 1 kepsts (7 setulae at forward position); scutellum 2 times wider than long, with pair of asc and bsc, asc 3 times longer than bsc. Legs slender, coxae and femora darkish brown, tibiae darkish yellow except hind tibia darkish brown with yellowish both ends, tarsi yellowish. Setae and setulae on legs black. Mid tibia with 1 black preapical dorsal seta. Wing ( Fig. 14 ) hyaline, unspotted; veins brown; Sc strong; M 1 between r-m and dm-cu longer than dm-cu. Calypter yellowish, with dense brownish microtrichae, margin with thin setulae. Knob of halter yellowish white.

Abdomen darkish brown with gray microtomentum. Setae and setulae on abdomen black; T2–T5 with setae, marginal setae longer than others; sternites with sparse black setulae at posterior 3/4. Posteromedial triangular projection of T1 into T2 strong; S2 irregularly horseshoe-shaped and the apical margin slightly sharp, S3 vertically rectangular, S4 irregularly horizontal rectangular, S5 horizontal trapezoid-shaped, the apical margin flat and smooth, 1.8 times wider than long. Male genitalia ( Figs 15–16 ). Epandrium with 5 pairs of strong black setae at middle; surstylus with upper blade of bifurcation tip swollen, short and apical blunted, the lower one thin; cercus arched with short sparse setae.

Female. Unknown.

Etymology. The specific epithet refers to the type locality, Ruili botanical garden.

Material examined. Holotype ♂, China, Yunnan, Dehong, Ruili (24°0′N, 97°51′E; elev. 800 m), 30.IV.2012, coll. Yuanye Liu. Paratypes. ♂, China, Yunnan, Dehong, Ruili (24°0′N, 97°51′E; elev. 800 m), 30.IV.2012, coll. Wenliang Li. All deposited in HAU .

Distribution. China (Yunnan).

Funding This research was supported by the National Natural Science Foundation of China (31672333), the Agricultural Science and Technology Innovation Project of Henan (30600309) , and the Agricultural Technology System of Henan (S2014-11-G03).

Acknowledgements The authors express their sincere thanks to Mr. Yuanye Liu, Dr. Wenliang Li and Dr. Yuyu Wang (Beijing) for their kind help and for collecting the specimens.

Figures

Figures 13–16. Phyllomyza ruiliiensis sp. nov., male. 13. Head, lateral view. 14. Wing. 15. Epandrium, cerci, and surstyli, posterior view. 16. Epandrium, cerci, and surstyli, lateral view. Scale bars=0.1 mm.