Czernyola luteigenis, Yang & Yin & Xi, 2021

Yang, Shuai-Lai, Yin, Xin-Ming & Xi, Yu-Qiang, 2021, Three new species of the genus Czernyola Bezzi, 1907 (Diptera, Clusiidae) from China, ZooKeys 1029, pp. 175-183 : 175

Czernyola luteigenis sp. nov. Figures 1-6

Type material.

Holotype: ♂, China, Tibet, Motuo, Mt. Nanzelama, 1200 m, 23.VI.2018, leg. Qi-Cheng Yang. Paratypes: 2 ♂♂, same date as holotype.

Diagnosis.

Head mostly yellowish; postgena with a single well-developed seta. Scutum dark yellow, mesonotum with dark brown subtriangular marking. Abdomen dark brown, anterior half of tergite I yellow. Surstylus with four distal tubercules. Pregonite with large distal lobe, distal 3/5 setulose, 1 medial seta.

Description.

Male. Body length 3.5 mm, wing length 2.9 mm.

Head (Fig. 1 ) yellowish, postgena slightly brownish; frons dark yellow; occiput dark yellow in the middle and dark brown on both sides; gena ~ 1/5 as high as eye. Setae and setulae black, ocellar tubercle and anterolateral margins of the frons dark brown. Four fronto-orbitals, hind seta weak. Three genal setae and 1 well-developed seta on postgena. Antenna yellowish, first flagellomere white without infuscation. Arista sparsely short plumose. Palpus light yellow.

Thorax dark yellow, pronotum dark brown anteriorly, mesonotum with dark brown subtriangular marking and anterior extend to prontum, scutellum brown and lateral margins slightly yellow. Prescutellar acrostichal seta present. One postpronotal seta, 2 notopleural setae, 1 presutural supra-alar seta, 3 dorsocentral setae, anterior seta about 1/3 length of posterior seta, 1 postsutural intra-alar seta, 2 postalar setae, 2 later scutellar setae. Prescutellar about 1/3 length of posterior dorsocentral seta. Thoracic pleura light yellow, anepisternum and posterior half of katepisternum dark brown, mediotergite brown dorsally, meron with brown tinge. One anepisternal seta, 1 katepisternal seta. Legs light yellow, coxa white. Wing (Fig. 2 ) dusky, more heavily infuscated on distal 1/3, along r2+3, the front half of all veins of the whole wing brownish and poster half of veins dark brown, M1 ratio: distal portion of M1 (the part beyond Dm-Cu) 5 × as long as Dm-Cu. Halter white.

Abdomen dark brown, anterior half of the tergite I yellow; setulae and setae on abdomen black. Male genitalia (Figs 3-6 ): epandrium as wide as high; cerci large, oval-shaped, 2 × as high as wide, 1/4-1/2 unified at the base and the rest separated; surstylus 0.5 × length of epandrium, distal 2/3 expanded, 2 × as wide as anterior 1/3; inner and outer faces with sparse setulae, four apical tubercules. Pregonite with large distal lobe, setulose on distal 3/5, 1 medial seta. Distiphallus long, membranous, with sclerotized bands along length, distally pointed and slightly forked.

Female. Unknown.

Distribution.

China (Tibet).

Etymology.

The specific name refers to the yellow gena.

Remarks.

This new species is somewhat similar to Czernyola varicolor (Sueyoshi), but differs in the surstylus bearing apical tubercules and the pregonite having obvious setae. In C. varicolor the surstylus has no apical tubercules, and the pregonite is without obvious medial setae ( Sueyoshi 2006).

Figures

Figures 1 - 6. Czernyola luteigenis sp. nov. (male) 1 head, lateral view 2 wing 3 epandrium, cerci, and surstyli, posterior view 4 epandrium, cerci, and surstyli, lateral view 5 hypandrial complex, posterior view 6 hypandrial complex, lateral view. Scale bars: 0.1 mm. Abbreviations: epand - epandrium; cerc - cerci; sur - surstylus; hypd - hypandrium; pregt - pregonite; basph - basiphallus; distph - distiphallus.