Trichoformosomyia cuonaensis Zhang & Li, 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

Trichoformosomyia cuonaensis Zhang & Li sp. nov.

Fig. 2

Materials examined.

Holotype: China • ♂ (SYNU-XZ 21006); Tibet (= Xizang); Shannan Prefecture, Cuona, Mamamenba Village ; 27°52'N, 91°47'E; 2796-2850 m elev.; 3.VIII.2021; C.T. Zhang & X.Y. Li leg. Paratype: 1♂ (SYNU-XZ 21007); same locality and date as holotype; JJ Li leg.

Etymology.

The specific epithet is derived from the locality name, Cuona County, southern Tibet, China.

Diagnosis.

This species is similar to Trichoformosomyia sauteri Baranov, which is distributed in Japan, Russia (southern Far East), China (Hunan, Guangxi, Sichuan, and Taiwan), Vietnam, Myanmar. It differs from the latter in having entirely dark-brown antennae and a dark postprontal lobe with gray pruinosity, dark-brown coxae and tibiae, abdominal syntergite 1+2 with 2 median marginal setae.

Description.

Male. Body length 9.1 mm.

Head (Fig. 2C, D ). Frontal vitta linear, fronto-orbital plate, and parafacial with grayish-white pruinosity; occiput with grayish-white pruinosity. Antenna dark brown. Palpi yellow, labella yellow. Frons narrower than postpedicel width, 1/7-1/8 of eye width; genal height 1/8-1/9 of eye height or as wide as postpedicel; lower margin of face protruding forward. Vibrissa inserted at level of lower margin of face. 11-13 frontal setae, upper ones strongest, with a pair of uppermost setae strong and crossed; ocellar setae slender, hair-like. Inner vertical setae slender, hair-like; outer vertical seta hair-like, about as long as postocular setae; postocellar setae 2. Occiput mostly with white hairs except for a row of black hairs below postocular setae. Antenna with postpedicel about 3 times as long as pedicel or about 5 times as long as wide in dorsal view; pedicel with a slender seta on dorsal surface, which about twice as long as pedicel. Arista plumose; longest aristal hairs about as wide as postpedicel. Prementum 4.5-5 times as long as wide.

Thorax (Fig. 2A, B ) black, with brownish-gray pruinosity; scutum with 2 broad outer and 2 narrow inner longitudinal vittae; pruinose distance between inner and outer vittae on presutural scutum about 2.5 times as wide as inner vitta; two inner longitudinal vittae on postsutural scutum combined with a broad black longitudinal vittae and extending to level of last posterior dorsocentral seta. Scutellum dark black. Postpronotal lobe black, with gray pruinosity; postalar callus dark brown. Notopleura and pleura with grayish-white pruinosity. Prosternum with hairs on sides. Postpronotal lobe with 3-4 setae arranged in a triangle; anterior 1-2 finer. One presutural and 2-3 postsutural acrostichal setae; 2 presutural and 3 postsutural dorsocentral setae, 3 postsutural intra-alar setae, 3 supra-alar setae, first one distinctly shorter than notopleural seta and first one postsutural intra-alar seta. Scutellum with three pairs of marginal scutellar setae; apical scutellar setae crossed and slightly longer than scutellum and subequal in length to basal scutellar setae; subapical scutellar setae distinctly longer than apical scutellar setae. Proepisternum bare; anepisternum with 2 upper anterior setae and a row of posterior setae; 3 katepisternal setae; anepimeral setae hair-like; katepimeron with 2-3 black hairs; katatergite bare.

Wing pale brownish, distinctly tinged with pale yellow on basal and anterior portion; tegula and basicosta dark brown. Calypters pale yellowish; lower calypter with short fringe on outer margin and not divergent from scutellum. Halter yellow. Relative lengths of 2nd, 3rd, and 4th costal sectors approximately as 1:2.1:1. Base and apex of first costal sector with distinctly long setae; dorsally setulae on r4+5 about twice as long as setulae on first and 2nd costal sectors. Base of vein R4+5 to vein r-m with a row of setulae ventrally and 3 setae on basal part dorsally. Bend of vein M bluntly angulated; section of M between crossveins R-M and dM-Cu longer than section between dM-Cu and bend of M, the distance between vein M from crossvein dM-Cu to bend about 2.4 times distance between bend to posterior margin of wing, or slightly shorter than distance between bend to apex of M. Crossvein dM-Cu slightly bent anteriorly. Ultimate section of wing vein CuA1 about 1/2 length of crossvein dM-Cu.

Legs coxae dark brown, with grayish pruinosity; trochanters reddish brown; femora, tibiae, and tarsi dark brown. Claws dark brown; pulvillus pale yellow. Fore claw slightly longer than 5th tarsomere; fore tibia slightly longer than head height, with a row of 4-6 short, anterodorsal setae on upper 2/3; 1 posterior seta; 1 preapical dorsal seta distinctly longer than preapical anterodorsal seta; 1 preapical posteroventral seta. Mid femur with 2 anterior setae on middle and 2 preapical posterodorsal setae. Mid tibia with 1 anterodorsal, 2 posterior, and 1 ventral seta; 3 preapical dorsal setae, including 1 dorsal, 1 posterodorsal, and 1 posterior setae; 1 preapical anteroventral and 1 preapical posteroventral setae; 2 preapical posterodorsal setae. Hind femur with a row of posteroventral setae on basal half, a row of complete anterodorsal setae, 1 preapical anteroventral seta. Hind tibia with 4-5 anterodorsal setae, 2 strong, 2-3 posterodorsal setae, 4-5 ventral setae (lowest one strong), 3 preapical dorsal setae, 1 preapical anteroventral seta, without distinct preapical posteroventral seta.

Abdomen long, ovate, reddish yellow; dark brown on middle longitudinal portion of tergites, posterior 2/3 of tergite 4 and entire tergite 5; tergite 5 with grayish-white pruinosity on anterior half. Syntergite 1+2 medially excavate to 2/3-3/4, with 2 median marginal setae, with 1 lateral marginal and 3-4 lateral discal setae. Tergites each with erect hairs; tergite 3 with 2 median marginal setae, 1 lateral discal seta, without median discal seta; tergite 4 with a row of marginal setae, without median discal and lateral discal seta; tergite 5 separately with a row of marginal setae and 2 lateral discal setae. Sternite 1 with black hairs on margin.

Sternite 5 and male terminalia as Fig. 2E-I . In ventral view, sternite 5 nearly square; V-shaped median cleft about 5/9 of the sternite length; apex of lateral lobe slightly blunt and with an inner protruding and pointed apically. In caudal view, syncercus distinctly narrowed and pointed only at apex; surstylus long, thin, slightly blunt at apex. In lateral view apex of syncercus distinctly arc-like and bent ventrally; surstylus long, straight, bluntly rounded at apex; membranous and sclerotized parts of distiphallus long and narrow; pregonite long; ejaculatory apodeme large; postgonite short and arc-like.

Female. Unknown.

Distribution.

China (Tibet; Fig. 8 ).

Figures

Figure 2. Trichoformosomyia cuonaensis sp. nov. A, B ♂, bodies, dorsal and lateral views C, D ♂, heads, anterior and lateral views E sternite 5, ventral view F, G phallus (ejaculatory apodeme, aedeagal apodeme, hypandrium, pregonite, postgonite, basiphallus and distiphallus) of male, dorsal and lateral views H, I 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.