Phyllomyza glossophyllusa, 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 : 312-313

Phyllomyza glossophyllusa sp. nov. ( Figs 5–6 )

Diagnosis. This new species is somewhat similar to P. nudipalpis Malloch , but differs from the gena approximately one-sixth of eye height; knob of halter darkish brown, stalk brown. In P. nudipalpis , the gena approximately one-eighth of eye height; knob of halter yellow white, stalk yellow ( Malloch, 1914b).

Description. Male. Body length 1.9 mm; wing length 2.1 mm.

Head ( Fig. 5 ) black with grayish microtomentum. Orbital plate subshiny black with microtomentum, ocellar triangle black without microtomentum; lunule strap-shaped, dark yellow with brownish yellow margin. Posterior eye margin ventrally diverging from head margin, eye 1.3 times as high as long, gena approximately one-sixth 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 darkish brown orbital stripe, orbital setae lateroclinate and frontal setae medioclinate, 4 interfrontal setae; postocellar setae cruciate. Lunule with 2 setae. Vibrissal angle relatively right-angle, vibrissa strong and located at level of lower eye margin. Antenna blackish brown with brownish microtomentum; pedicel with short black setulae at middle and margin, setulae at margin longer than others, longest one about 3 times longer than the others; first flagellomere with pubescence, irregularly square; arista black, with short pubescence, 2.5 times as long as first flagellomere. Proboscis relatively long, darkish yellow with sparse setulae. Palpus thick and long, basal wide and enlarged, apical gradually narrowed in lateral view, about 0.6 mm; blackish brown with short dense black pubescence, margin with obviously short sparse setulae.

Thorax darkish brown with grey microtomentum, except mesonotum shiny darkish brown; scutellum darkish brown with gray microtomentum. Setae and setulae on thorax black; 1 h, 2 dc, 1 prsc, 2 npl, 1prs, 1 sa, 1 pa, 1 kepsts (9 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. 6 ) hyaline; veins brown; Sc strong; M 1 between r-m and dm-cu longer than dm-cu. Calypter yellowish, with dense brownish microtrichae and margin with brownish 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 weak; S2 generally horseshoe-shaped and apical margin slightly sharp, S3 vertically rectangular, S4 horizontally rectangular, longer than S5, S5 generally horizontally rectangular, apical margin flat and smooth, 2.3 times longer than wide. Male genitalia ( Figs 7–8 ). Epandrium extremely circular with 14 pairs of strong setae; surstylus with upper blade extremely swollen and lower one slightly thin; cercus arched and with short sparse setae.

Female. Unknown.

Material examined. Holotype ♂, China, Yunnan, Dali, Cangshan (25°41′N, 100°08′E; elev. 2100 m), 3. VI.2012, coll. Yuyu Wang. Paratypes. 1♂, same data as holotype ; 1♂, China, Yunnan, Baoshan, Dahaoping (25°19′N, 99°12′E; elev. 1925 m), 4. V.2012, coll. Yuanye Liu ; 3♂, China, Yunnan, Baoshan, Dahaoping (25°19′N, 99°12′E; elev. 1925 m), 5. V.2012, coll. Wenliang Li ; 1♂, China, Yunnan, Tengchong, Zizhi (25°43′N, 98°34′E; elev. 1650 m), 7. V.2012, coll. Yuanye Liu ; 3♂, China, Yunnan, Tengchong, Datang (25°37′N, 98°40′E; elev. 1850 m), 8. V.2012, coll. Wenliang Li. All deposited in HAU.

Distribution. China (Yunnan).

Etymology. The specific epithet refers to the shaped of palpus.

Figures

Figures 5–8. Phyllomyza glossophyllusa sp. nov., male. 5. Head, lateral view. 6. Wing. 7. Epandrium, cerci, and surstyli, posterior view. 8. Epandrium, cerci, and surstyli, lateral view. Scale bars=0.1mm.