Tachina jilongensis Zhang & Dong, 2024

Dong, Ruiqing, Li, Junjian, Yang, Hui & Zhang, Chuntian, 2024, Three new species and two newly recorded species of Tachininae from Tibet, China (Arthropoda, Insecta, Diptera, Tachinidae), ZooKeys 1191, pp. 215-235 : 215

Tachina jilongensis Zhang & Dong sp. nov.

Fig. 6

Materials examined.

Holotype: China • ♂ (SYNU-XZ 210001); Tibet (= Xizang); Rikaze, Jilong County, Jipu Village , Grand Canyon ; 28°22'N, 85°19'E; 2742 m elev.; 21-22.VII.2021; C.T. Zhang & X.Y. Li leg. Paratypes: 3♂ (SYNU-XZ 210002 to 210004); same data as holotype • 1♂ (SYNU-XZ 210005); Tibet; Rikaze, Jilong County, Langjiu Village , Inspection Station ; 28°21'N, 85°20'E; 2578-2902 m elev.; 23.VII.2021; C.T. Zhang & X.Y. Li leg.

Etymology.

The specific epithet is taken from Jilong County where the type locality of this species is located.

Diagnosis.

This species is closely similar to T. rohdendorfiana Chao & Arnaud, but it is distinguished from the latter in having wider frons and parafacial, narrower postpedicel in male, genal height 0.8-0.9 of eye height, apical scutellar setae parallel, abdomen with black median portion which wider than 1/3 of the tergites 3 and 4, tergites 3 with a pair of large, brownish-yellow lateral markings, tergite 4 covered with two yellowish-white lateral pruinose markings, with dense, straight, yellowish-white hairs on lateral surface and black hairs on median dorsal portion, syntergite 1+2 with 12 median marginal and 3-5 lateral marginal and laterodiscal setae, without ventral marginal seta, with black and some yellowish-white hairs on ventral surface, tergites 3 with a complete row of black marginal setae on dossal surfaces, with 1-3 laterodiscal setae and without ventral marginal seta, with black and some yellowish-white hairs on ventral surface, tergite 4 covered with two yellowish-white pruinose lateral markings, with a complete row of marginal setae and black hairs on dorsal and ventral surfaces and 3-5 laterodiscal setae, only tergite 5 entirely black, with erect, dense, long, brownish-red hairs on dorsal and ventral surface and a row of strong, black, discal setae and a row of black marginal setae on dorsal and ventral surfaces. Sternite 2 with 5-6 setae.

Description.

Male. Body length 12-14 mm.

Head (Fig. 6C, D ). With grayish-white pruinosity; frontal vitta reddish brown to brown, fronto-orbital plate with pale-yellow pruinosity; lunule brown; parafacial and gena with grayish-white pruinosity; occiput with grayish-white pruinosity. Antenna with postpedicel black, with thin, gray pruinosity; pedicel brown to dark brown, with grayish-white pruinosity; base of arista dark brown to brown; palpi yellow; prementum gleaming black. Eye bare. Frons 0.3-0.33 times width of head or slightly narrower than width of eye; frontal vitta widened anteriorly, narrower than fronto-orbital plate width at narrowest point. Parafacial about as wide as postpedicel in anterior view. Genal height 0.8-0.9 of eye height; lower margin of face protruding forward; 5-6 pairs of frontal setae, with lowest setae at level with base of pedicel. Inner vertical setae strong and parallel, slightly longer than eye height; outer vertical seta outward, about 0.67 times as long as inner vertical seta; ocellar seta strong, proclinate, and about as long as upper frontal setae; a pair of smaller postocellar setae upward. Fronto-orbital plate with fine black hairs; parafacial mostly with black hairs and only white hairy on upper portion. Facial ridge with 3 setae inserted above of vibrissa. Vibrissa strong, inserted above level of lower margin of face, equal or longer than postpedicel, with a row of slender subvibrissae below vibrissae. Gena with white hairs. Occiput with long, pale-yellow hairs behind postocular setae. Postpedicel ovate, slightly narrower than parafacial and shorter than pedicel; arista bare, about as long as the combination of pedicel and postpedicel; 2nd aristomere 2-2.5 times as long as its diameter. Palpi slender, longer than antenna or prementum. Prementum 4-5 times as long as wide.

Thorax (Fig. 6A, B ) darkly colored, with thin, gray pruinosity; dorsum with 4 dark, longitudinal vittae; outer vittae on anterior 3/5 of postsutural scutum, inter vittae on anterior 2/5 of postsutural scutum; scutellum dark on base, reddish yellow on apical 2/3, with dense, long, yellow hairs. Anterior spiracle brownish yellow, with yellow hairs; posterior spiracle dark yellow. Thoracic dorsum densely covered with yellow fine hairs and mixed with some fine black hairs. Postpronotal lobe with 5-6 setae; 3 strong basal setae set in a triangle, 3-4 presutural and 2 postsutural acrostichal setae, 4 presutural and 4 postsutural dorsocentral setae, 1 presutural and 2 postsutural intra-alar setae, 3 strong supra-alar setae, proepisternum hairy, prosternum bare, 2 notopleural setae, meron with a row of setae, katepimeron (= barette) bare, 3 katepisternal setae. Scutellum reddish yellow except for dark base, with erect, dense, yellowish hairs, 4 pairs of marginal setae, and three pairs of discal setae along margin; apical scutellar setae standing in a straight line, not crossed, about 2 times as long as wide, and as long as subapical scutellar setae.

Wing hyaline, tinged with brownish; tegula dark brown and basicosta brownish yellow. Upper calypter pale brown except whitish anterior half; lower calypter yellowish white. Halter dark brown on apical 1/2, and brown on basal half. Costal spine absent; second costal sector of wing bare ventrally; relative lengths of 2nd, 3rd and 4th costal sectors approximately as 2.5:3.5:1; bend of vein M about right-angled; last section of vein Cu about 2/3 as long as crossvein dM-Cu; base of vein R4+5 with 5-6 short, black hairs on dorsal and ventral surfaces; cell R4+5 open.

Legs dark brown except for apex of femora reddish brown; tibiae and tarsi reddish yellow; claws reddish yellow except for dark apex; pulvillus pale yellow. Fore claws and pulvillus longer than 4th and 5th tarsomere combined; first tarsomere with dense, short, yellow, brush-like hairs on ventral surface. Fore tibia with a row of anterodorsal and posterodorsal setae; 2 posterior setae; mid femur with 3 anterior setae; mid tibia with a row of strong anterodorsal setae, 5 posteroventral setae, 1 strong ventral seta. Hind femur with a row of anteroventral setae, 3 preapical anterodorsal setae and 3-4 preapical dorsal setae; hind tibia with a row of irregular anterodorsal setae, 4 posterodorsal and 2 ventral setae, and apex with 2 dorsal setae, 1 anterior, 1 anteroventral, and 1 posteroventral seta.

Abdomen ovate, black on base; median depression of syntergite 1+2 extending to posterior margin; tergites 3 and 4 each with a pair of large, brownish-yellow lateral markings, and covered with dense, yellowish-white pruinose markings on tergite 4; tergite 5 gleaming black, with a shallow median depression at posterior portion. Syntergite 1+2 and tergite 3 with dense, straight, black hairs; tergite 4 with two yellowish-white pruinose lateral markings and covered with dense, straight, yellowish-white hairs, black hairs on dorsal-median portion; tergite 5 with dense, fine, brownish-red hairs. Syntergite 1+2 with 12 (6 pairs of) black, median, marginal setae, 3-5 lateral marginal setae, and 2-4 laterodiscal setae; without ventral marginal seta; with black and some yellowish-white hairs on ventral surface; tergite 3 with a complete row of 24-26 black marginal setae on dorsal surface and 1-3 laterodiscal setae, without ventral marginal seta, with black and some yellowish-white hairs on ventral surface; tergite 4 with a complete row of 30-34 marginal setae, black hairs on dorsal and ventral surfaces, and 3-5 laterodiscal setae; tergite 5 with a row of strong, black discal setae and a row of black marginal setae on dorsal and ventral surfaces. Sternite 1 with yellowish hairs; sternite 2 with 5-6 setae; sternite 3 with 6-8 setae; sternite 4 with 8 setae. Sternite 5 and male terminalia as Fig. 6E-H . In ventral view, sternite 5 nearly rectangular, with V-shaped median cleft about 1/3 of the sternite length; lateral lobe slightly pointed at apex. In caudal view, cerci slender and narrowed and pointed apically; surstylus slightly shorter and pointed apically, with a medially deep crevice. In lateral view, cerci slightly bent ventrally and pointed at apex; surstylus broad, bluntly rounded. Distiphallus with some setulae on membranous and sclerotized parts. Pregonite long and pointed apically; postgonite short and blunt apically, bent anteriorly.

Female. Unknown.

Distribution.

China (Tibet; Fig. 8 ).

Figures

Figure 6. Tachina jilongensis sp. nov. A, B ♂, bodies, dorsal and lateral views C, D ♂, heads, anterior and lateral views E sternite 5, ventral view F phallus (aedeagal apodeme, pregonite, postgonite, basiphallus and distiphallus) of male, lateral view G, H cerci, surstyli and epandrium of male, caudal and lateral views.

Figure 8. New distribution records of Tachininae from Tibet, China. 1, 2 Leskia latisurstyla Zhang & Dong, sp. nov. 3 Trichoformosomyia cuonaensis Zhang & Li, sp. nov. 4 Tachina jilongensis Zhang & Dong, sp. nov. 5 Nemoraea javana (Brauer & Bergenstamm, 1895) 6 Nemoraea echinata Mesnil, 1953.