Neurigona yaoi Wang, Chen & Yang, 2010

Wang, Mengqing, Chen, Hongyin & Yang, Ding, 2010, New species of the genus Neurigona (Diptera: Dolichopodidae) from China, Zootaxa 2517 (1), pp. 53-61 : 58

Neurigona yaoi Wang, Chen & Yang sp. nov.

( Figs. 8–10 )

Diagnosis. Seven strong dc bristles, pleuron chiefly black. Tarsomere I 5 distinctly elongated and swollen, covered with dense spine-like bristles dorsally and laterally.

Male. Body length 4.4 mm, wing length 4.2 mm.

Head metallic green with pale gray pollen; face narrow, eyes separate on face. Hairs and bristles on head black; postocular bristles pale. Antenna yellow ( Fig. 8 ); first flagellomere about as long as wide, somewhat obtuse apically; arista brownish with basal segment 0.1 times as long as apical segment. Proboscis pale with pale setae; palpus pale yellow, with pale setae and 2 yellow apical bristles.

Thorax yellow with yellow pollen; mesonotum with anterior margin black, and with black lateral spots on mid and posterior portion; scutellum yellow; metanotum black; propleuron black, pteropleuron and all posterior pleuron whole black. Setae and bristles on thorax black; 7 strong dc bristles, 7–8 irregularly paired acr bristles. Propleuron with pale hairs and 1 yellow bristle on lower portion. Legs yellow [tarsomere II 3-5 broken]; fore tibia and tarsomere I 1 brown, tarsomere I 5 black; tarsomere III 2-5 brown. Setae and bristles on legs black. Coxa I with yellow setae and 4–6 yellow bristles on apical portion; coxa III with 1 black outer bristle near middle; tarsomere I 5 distinctly elongated and swollen, covered with dense spine-like bristles dorsally and laterally ( Fig. 9 ). Tibia II with 2 ad bristles, 1 pd bristle, and 2 v bristles, apically with 3 bristles; hind tibia with 4 ad bristles, 3-4 pd bristle, and 5-6 v bristles, apically with 4 bristles. All segment 1 of tarsomere I-III each with row of 5-6 v bristles. Relative lengths of tibia and 5 tarsomeres of legs LI 5.0: 6.0: 2.7: 1.3: 0.3: 0.6; LII 7.0: 7.0: 2.9:?:?:?; LIII 5.0: 6.0: 2.7: 1.3: 0.3: 0.6.

Wing hyaline; veins black, M 1+2 strongly bent apically and convergent with R 4+5; CuAx ratio 0.5. Squama yellow with pale setae. Halter yellow.

Abdomen yellow with yellow pollen; terga 1–5 each with large black basal spot; hypopygium shiny black. Abdominal segment 5 without ventral projection. Setae on abdomen chiefly black.

Genitalia ( Fig. 10 ). Epandrium somewhat round, basally with 2 slender processes, each with furcated apex. Surstylus with wide dorsal lobe; ventral lobe long and wide, with slender finger-like projection apically. Cercus white, somewhat round, with short setae.

Female. Unknown.

Type Material. Holotype: male, Neimenggu: Moerdaoga , 2009.VII.21, Gang Yao . Holotype deposited in CAU.

Etymology. The specific epithet derives from the collector Gang Yao.

Distribution. Known only from the type locality in Neimenggu.

Remarks. The species is similar to Neurigona micropyga Negrobov , but can be separated from the latter by the chiefly black pleuron and the normal fore claw. In N. micropyga , the pleuron is chiefly yellow, and the fore claw is distinctly elongated, spine-like.

Figures

FIGURES 8–10. Neurigona yaoi sp. nov. (male). 8. First flagellomere and arista. 9. Fore tarsus, lateral view. 10. Genitalia, lateral view. C—cercus; H—hypandrium; LP—lateral process; SDL—surstylus dorsal lobe; SVL—surstylus ventral lobe. Scale bar = 0.25 mm.