Phyllomyza convexusa, 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 : 311-312

Phyllomyza convexusa sp. nov. ( Figs 1–4 )

Diagnosis. This new species is somewhat similar to P. dilatata Malloch , but differs from the gena approximately oneseventh of eye height; knob of halter brown yellow, stalk brown; cercus without ventral appendix. In P. dilatata , the gena approximately one-ninth of eye height; knob of halter yellowish white, stalk yellowish; cercus with longer ventral appendix, 1 seta on ventral appendix ( Malloch, 1914b).

Description. Male. Body length 1.7 mm; wing length 1.6 mm.

Head ( Fig. 1 ) black with grayish microtomentum. Orbital plate subshiny black with microtomentum, ocellar triangle blackish brown without microtomentum; lunule strap-shaped, darkish brown with black margin. Posterior eye margin ventrally diverging from head margin, eye 1.6 times as high as long, gena approximately one-seventh of eye height. Setae and setulae on head black; ocellar triangle with 2 long ocellar setae and 3 short setae; frons with 3 orbital and 2 frontal setae on black orbital stripe, orbital setae lateroclinate and frontal setae medioclinate, 4 interfrontal setae; postocellar setae cruciate. Lunule with 2 setae. Vibrissal angle relatively rectangular; vibrissa strong and located at level of lower eye margin. Antenna blackish brown with brownish microtomentum; pedicel with black setulae at middle and margin, setulae at margin longer than others, two longer setae, longest one about 2 times longer than the other one, about 3.5 times longer than the others; first flagellomere with pubescence, irregular sector; arista darkish brown, distinctly dense pubescence, 3.3 times as long as first flagellomere. Proboscis fold, darkish yellow at anterior 1/2, the rest part darkish brown, with sparse setulae. Palpus slightly rod-like with blunt apex in lateral view, about 0.3 mm, 3.5 times longer than wide; darkish brown with short dense brown pubescence, margin with sparse setulae.

Thorax darkish brown with grey microtomentum, except mesonotum shiny darkish brown; scutellum blackish brown with gray microtomentum. Setae and setulae on thorax black; 1 h, 2 dc, 1 prsc, 2 npl, 1prs, 1 pos, 1sa, 2 pa, 1 kepsts (a row setulae at forward position); scutellum 1.3 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 tibia darkish brown at posterior 2/3, tarsi yellowish. Setae and setulae on legs black. Mid tibia with 1 black preapical dorsal seta. Wing ( Fig. 2 ) hyaline; veins brown; Sc strong; M 1 between r-m and dm-cu longer than dm-cu. Calypter yellowish, with dense brownish microtrichae, margin with brownish setulae. Knob of halter brown yellow.

Abdomen yellowish brown with gray microtomentum. Setae and setulae on abdomen black; T2–T5 with setae at posterior 3/4, marginal setae longer than others; sternites with sparse black setulae. Posteromedial triangular projection of T1 into T2 strong; S2 generally horseshoe-shaped, S3 and S4 irregularly vertical rectangular; S5 generally saddle-shaped, 1.2 times wider than long. Male genitalia ( Figs 3–4 ). Epandrium with 7 pairs of strong setae; surstylus tip slightly swollen and apical slightly blunt; cercus arched and with short sparse setae.

Female. Unknown.

Material examined. Holotype ♂, China, Yunnan, Baoshan, Baihualing (25˚17ʹN, 98˚48ʹE; elev. 1370 m), 12.V.2012, coll. Yuanye Liu. Paratypes. 2♂, same data as holotype ; 3♂, China, Yunnan, Baoshan, Baihualing (25˚17ʹN, 98˚48ʹE; elev. 1372 m), 12.V.2012, coll. Wenliang Li. All deposited in HAU .

Distribution. China (Yunnan).

Etymology. The specific name refers to the apical abdomen of male swollen.

Figures

Figures 1–4. Phyllomyza covexusa sp. nov., male. 1. Head, lateral view. 2. Wing. 3. Epandrium, cerci, and surstyli, posterior view. 4. Epandrium, cerci, and surstyli, lateral view. Scale bars=0.1mm.