Luzonomyza vittifacies Li & Yang, 2021

Li 1, Wenliang, Chen 1, Xulong, Feng 1, Keli, Zhao 2, Shengjuan & Yang 3, Ding, 2021, Four new species of the genus Luzonomyza Malloch (Diptera, Lauxaniidae) from China, ZooKeys 1074, pp. 43-59 : 43

Luzonomyza vittifacies Li & Yang sp. nov.

Figures 26-30 , 31-34

Type material.

Holotype. ♂ (CAUC), China, Yunnan Province, Xishuangbanna Dai Autonomous Prefecture, Mengla County, yaoqu township; 21°43'32"N, 101°32'37"E; 780 m; 26 Apr 2007; Wenliang Li leg.

Etymology.

This epithet is an adjectival combination of the Latin adjective vitti (vittate) and noun facies (face), referring to the face with brown longitudinal stripes.

Diagnosis.

Head yellow; face with a pair of brown stripes extending from antennal base and confluent on ventral margin. Thorax brownish yellow with grayish-white pruinescence; legs yellow, fore tarsomeres 4 and 5 brown. Abdomen yellow, tergites 2-6 black on posterior margin but tergite 6 yellow posteromedially. Male genitalia: hypandrium broad, membranous; pregonite confluent with hypandrium; phallus with a pair of lateral acute processes near base in ventral view, apical concave V-shaped, with a dorsal acute subapical process in lateral view, apex acute and curved dorsally.

Description.

Male. Body length 3.2 mm, wing length 3.4 mm.

Head (Fig. 26 ) yellow. Face brownish yellow, with a pair of brown longitudinal stripes extending from antennal bases and confluent on ventral margin, face with an angular hump on middle of basal half; inner margin of parafacial with a brown stripe, broadening towards gena, with a black round spot between eye and antennal bases, parafacial with sparse short setulae, and 6 short black setae extending from parafacial ventral corner to gena. Frons as long as wide and parallel-sided, with a blackish-brown median line extending from anterior margin to ocellar triangle, and with short setulae on anterior half, denser on anterior margin; ocellar triangle grayish black; ocellar setae very small, hair-like, anterior fronto-orbital seta (situated at middle of fronto-orbital plate) reclinate, shorter than the posterior one. Gena ~1/3 height of eye and with broad brown stripe. Antenna yellow, first flagellomere brownish yellow and rounded apically, ~1.5 × longer than high; arista brown, pubescent. Proboscis mostly yellow except blackish brown at tip, with white and black setulae; palpus yellow with black setulae.

Thorax (Fig. 29 ) brownish yellow, with grayish-white pruinescence. Mesonotum with 4 broad brown stripes, 2 brown median stripes extending to tip of scutellum; 0+3 dorsocentral setae, anteriormost dorsocentral seta away from scutal suture; acrostichal setulae in 4 rows; a pair of prescutellar setae, missing. One anepisternal seta, 1 katepisternal seta. Legs mostly yellow, fore tarsomeres 4 and 5 brown. Fore femur with 8 posterodorsal setae and 6 posteroventral setae, fore tibia with a long dorsal preapical seta and a short apicoventral seta. Mid tibia with a strong dorsal preapical seta and an apicoventral seta. Hind tibia with a long dorsal preapical seta and a short apicoventral seta. Wing brown along costal margin extending to M1 and with hyaline spots, a brown spot on each of the crossveins r-m and dm-cu; subcostal cell brown; costa with 2nd (between R1 and R2+3), 3rd (between R2+3 and R4+5) and 4th (between R4+5 and M1) sections in ratios of 7.1: 1.4: 1.2; r-m beyond middle of discal cell; ultimate and penultimate sections of M1 in ratios of 4.9: 2.5; ultimate section of CuA1 ~1/5 of penultimate. Haltere yellow.

Abdomen (Fig. 30 ) yellow, tergites 2-6 black on posterior margin, but tergite 6 yellow posteromedially. Male genitalia (Figs 31-34 ): syntergosternite confluent with epandrium. Epandrium with a pair of black long conical dorsoapical processes in lateral view. Surstylus broken, hypandrium broad and membranous. Gonopod confluent with hypandrium, phallus consisting of a pair of sclerites in ventral view and a pair of lateral acute processes near base, with V-shaped apical concavity, broad basally and narrow apically in lateral view, with a dorsal acute process subapically, apex acute and curved dorsally. Phallapodeme claviform in ventral view. Ejaculatory apodeme bent.

Female. Unknown.

Remarks.

This new species is very similar to Luzonomyza gaimarii from China (Yunnan) in the wing spots and the thoracic and abdominal spots, but it can be separated from the latter by the pair of brown stripes on the face that extend down from antennal base and are confluent on ventral margin; by the 4 rows of acrostichal setulae; by r-m extending beyond middle of discal cell; by the absence of a lateral concavity in the hypandrium; and by the phallus being acute and curved dorsally in lateral view. In Luzonomyza gaimarii , the face has no spot; the acrostichal setulae are arranged in 2 rows; crossvein r-m is in the middle of the discal cell; the hypandrium has a lateral concavity; and the phallus is not curved dorsally in lateral view.

Distribution.

China (Yunnan).

Figures

Figures 26 - 30. Luzonomyza vittifacies sp. nov. Male 26 head, anterior view 27 wing 28 habitus, lateral view 29 thorax, dorsal view 30 abdomen, dorsal view.

Figures 31 - 34. Luzonomyza vittifacies sp. nov. Male 31 syntergosternite and epandrium, lateral view 32 epandrial complex, posterior view 33 phallic complex, ventral view 34 phallic complex, lateral view. Scale bar: 0.5 mm.