Compsiluroides meifengensis, Huang & Tachi, 2019

Huang, Yu-Zen & Tachi, Takuji, 2019, Taxonomic review of the genus Compsiluroides Mesnil (Diptera: Tachinidae), with the description of a new species, Zootaxa 4608 (2), pp. 345-356 : 353-355

Compsiluroides meifengensis sp. nov.

( Figs 4 , 20–26 )

Type material. HOLOTYPE Ƌ ( NMNS): [T A I W A N] Nantou, Meifeng / 24°05'22.2"N, 121°10'27.3"E, 2100m / 18.viii.2015, H. Shima leg. // HOLOTYPE / Compsiluroides meifengensis / Huang & Tachi, 2019.

PARATYPES. China: 1 Ƌ ( KUM), Sichuan, Dujangyan Shi, Qingchen Shen , 1300m, 12–13.viii.1993, H. Shima leg. Taiwan: 1 ♀ ( NMNS), Nantou, Meifeng , 18.viii.2015, H. Shima leg. ; 1 Ƌ ( BLKU), Nantou, Meifeng , 18.viii.2015, T. Tachi leg. ; 1 ♀ ( NMNS), Kaohsiung, Maolin, Tona forest rd., 17K [road sign], 29.iv.1998, W.T. Yang leg.

Diagnosis. Lower facial margin not protruded in lateral view; prementum short, about 3 times as long as wide; gena wider than 1/5 of eye height in female; surstylus tapered to apex in dorsal and lateral views.

Description. Body length: 5.3–7.6 mm.

Male. Head grayish-white pollinose, fronto-orbital plate brownish-gray; antenna and arista black; palpus yellow. Vertex 0.23–0.25 of head width; inner vertical seta strong, about 0.6 of eye height; outer vertical seta present, 0.4–0.5 times as long as inner vertical seta; ocellar setae present, slightly shorter than anterior reclinate orbital seta; frontal vitta widened anteriorly, about 1.7 times as wide as fronto-orbital plate at middle; 6 frontal setae, lowest seta at level of middle of pedicel; 2 reclinate orbital setae, anterior seta stronger than posterior one; parafacial bare, slightly narrowed in lower part, 0.75–0.85 times as wide as 1 st flagellomere at mid-height; face concave; facial ridge with several setae on lower 7/10; lower facial margin not protruded in lateral view; vibrissa arising at level of lower margin of face; compound eye hairy; gena 1/7–1/6 of eye height; occiput flattened; upper occiput with 1–2 rows of black setose; antenna not reaching level of lower facial margin; 1 st flagellomere 4–4.5 times as long as pedicel, about 3 times as long as wide; arista thickened on basal 0.3, 2nd aristomere about as long as wide; palpus weakly clavate, about 0.8 times as long as 1 st flagellomere ; prementum about 3 times as long as wide.

Thorax black in ground color; postpronotal lobe and notopleuron densely grayish-white pollinose, other portions of scutum and scutellum thinly gray pollinose; presutural area with 3 longitudinal gray vittae; pleurae rather densely grayish-white pollinose. Two postpronotal setae; 3 presutural and 3 postsutural acrostichal setae, first presutural seta fine; 3 presutural and 3 postsutural dorsocentral setae; 2 presutural and 3 postsutural intra-alar setae, first presutural seta fine; 1 presutural and 3 postsutural supra-alar setae, first postsutural seta fine; proepisternum bare; 3 katepisternal setae, lower anterior seta 0.6 times as long as upper one; anatergite bare; scutellum with 3 pairs of marginal setae, basal seta strong, subapical setae strong and divergent, about as long as lateral seta; a pair of discal setae sometimes present. Wing hyaline, slightly tinged with pale brown anteriorly; tegula and basicosta black; lower calypter pale yellowish-brown. Second costal sector setose ventrally; relative lengths of 2nd, 3rd and 4th costal sectors approximately 1:2.25:1; distance of vein M from crossvein dm-cu to bend about 2.75 times distance between bend and wing margin. Legs black, pulvilli pale yellowish-brown. Fore tibia with 2 posterior, 1 preapical dorsal and 1 preapical posteroventral setae; mid tibia with 1 anterodorsal, 2 posterodorsal, 1 ventral, 1 preapical anterodorsal, 1 preapical posterior and 2 preapical ventral setae; hind tibia with 4 anterodorsal, 2 posterodorsal, 2 ventral, 2 preapical dorsal and 1 preapical ventral setae; claws and pulvilli longer than 5th tarsomere.

Abdominal dorsum black in ground color, whitish pollinose on anterior 1/5 of tergite 3, 2/5 of tergite 4, and 1/2 of tergite 5; mid-dorsal longitudinal vitta distinct on tergites 3–5. Syntergite 1+2 and tergite 3 with pairs of median and lateral marginal setae; tergite 4 with 7 marginal setae; tergite 5 with 7 marginal setae; sternite 5 with V-shaped cleft bearing some setae. Postabdomen. Epandrium nearly trapezoidal in lateral view, with some setae; surstylus slender, tapered to apex in lateral view, tapering and curved inward, with some setae in apical 1/ 4 in dorsal view; cercus pointed apically in lateral view, nearly triangular, with dense setae along entire length in dorsal view; hypandrial arms not fused; pregonite fused with hypandrium ventrally at base, nearly rectangular, with some setae dorsally; postgonite nearly square and rounded apically; epiphallus short, subequal in length to postgonite; distiphallus membranous medially with many spinules ventrally in lateral view, apex narrowly rectangular in dorsal view.

Female. Differs from male as follows: vertex about 0.29 of head width; gena 2/9–1/4 of eye height; scutellum with apical setae, parallel to slightly divergent, horizontal [hair-like in 1 specimen].

Etymology. This species is named after the type locality Meifeng (Nantou, Taiwan).

Distribution. China (Sichuan), Taiwan.

Remarks. Compsiluroides meifengensis sp. nov. is similar to C. flavipalpis . However, it can be distinguished from this species by surstylus tapered to apex in lateral view and cercus wider in dorsal view in male and gena wider, more than 1/5 of eye height, in female. The type specimens were collected from mountainous areas between 1300 and 2100 m.

Figures

FIGURES 1–4. Compsiluroides spp., male heads in lateral view. 1. Compsiluroides communis Mesnil (China, Sichuan; KUM); 2. Compsiluroides communis (China, Shaanxi; KUM); 3. Compsiluroides flavipalpis Mesnil (Japan, Honshu; BLKU). 4. Compsiluroides meifengensis sp. nov. (paratype from Meifeng, Taiwan; BLKU). Arrows indicate protruded lower facial margin. Scale bars: 0.5 mm.

FIGURES 20–25. Compsiluroides meifengensis sp. nov., holotype Ƌ (NMNS). 20. Habitus in lateral view (prior to dissection of terminalia). 21. 5th sternite in ventral view. 22. Epandrium, cerci and surstyli in dorsal view. 23. Epandrium, cercus and surstylus in lateral view. 24. Hypandrium, pregonite, postgonite and phallus in lateral view. 25. Apex of distiphallus in posterior view. Scale bars: 1 mm (Fig. 20); 0.25 mm (Figs 21–25).

FIGURE 26. Distribution map for Compsiluroides spp. in East Asia. Black dot = C. communis Mesnil; blue dot = C. flavipalpis Mesnil; red dot = C. meifengensis sp. nov.