A new genus of the tribe Blondeliini (Diptera: Tachinidae: Exoristinae) from the Oriental Region with morphological and molecular evidence Author Huang, Yu-Zen Author Tachi, Takuji text Zootaxa 2024 2024-08-19 5496 2 151 171 http://dx.doi.org/10.11646/zootaxa.5496.2.1 journal article 10.11646/zootaxa.5496.2.1 1175-5326 13346500 FDF92FEA-A841-4CB0-AE31-FC937007DEC0 Shimamyia vietnamensis sp. nov. ( Figs. 2E–F , 7 ) Type material. HOLOTYPE male ( BLKU ): [ V I E T N A M] / Danbri ( 800 m ) 15 km NW. Bao Lok / 29.V– 1.VI.2002 / Ta Huy Thinh. Diagnosis. Gena approximately 0.19 of eye height. Vertex approximately 0.2 of head width in male; antenna with postpedicel approximately 2.5 times as long as pedicel in male; 3 katepisternal setae; male abdominal tergite 4 and 5 with dense recumbent hairs dorsally; male postabdomen with surstylus swollen at middle and rounded apically in lateral view, tapering and strongly curved inward in dorsal view; cerci swollen nearly apex in dorsal view; pregonite tapering and pointed apically; female postabdomen not elongate. Description. Resembling the preceding species, but differing as follows: Body length: 6.36 mm . Male . Head with vertex approximately 0.2 of head width; inner vertical seta about 0.27 of eye height; outer vertical seta 0.58 times as long as inner vertical seta; frontal vitta about 2.2 times as wide as fronto-orbital plate at middle; approximately 8 frontal setae, lowest seta at level of middle of pedicel; 3–4 reclinate orbital setae, anterior seta stronger than posterior one; parafacial about 0.8 times as wide as postpedicel at mid-height; facial ridge with several setae approximately on lower 0.35; gena approximately 0.19 of eye height. Antenna with postpedicel about 2.5 times as long as pedicel, 3 times as long as wide; arista thickened approximately approximately on basal 0.15; palpus near 0.97 of postpedicel; prementum about 3 times as long as wide. Thorax with 2 postpronotal setae; 3 presutural acrostichal setae; 4 postsutural intra-alar setae; 3 katepisternal setae; scutellum with 3 pairs of marginal setae and a pair of discal setae present. Wing tinged with brown anteriorly; tegula and basicosta black; lower calypter brown. Relative lengths of 2nd, 3rd and 4th costal sectors 1.0:2.6:1.2; distance of vein M from crossvein dm-cu to bend about 0.75 times distance between bend and wing margin. Legs with mid tibia with 3 posterodorsal seta; hind tibia with 2 anterodorsal, 2 posterodorsal, 2 ventral setae. Abdominal with very thin whitish pruinosity. Hair very dense, recumbent and fine on dorsum of tergite 4 and 5. Syntergite 1+2 with a pair of lateral discal, a pair of median marginal and 2 pair of lateral marginal seta; tergite 3 with 2 pairs of lateral marginal setae; tergite 4 with a pair of discal setae; tergite 5 with a pair of discal and 12 marginal setae; sternite 5 rounded anteriorly, with some setae on posterior half. Postabdomen . Epandrium nearly trapezoidal and abruptly narrowed at apex and rounded dorsally in lateral view, with some setae; surstylus widened at middle, abruptly narrowed and rounded apically with some setae from apical 2/ 3 in lateral view, curved inward and pointed apically with some setae from apical 2/ 3 in dorsal view; cerci rounded apically with some setae along entire length in lateral view, nearly V-shaped, swollen near apex and pointed apically with some setae along entire length in dorsal view; pregonite pointed apically; postgonite with some setae. Female . Unknown. Etymology. The holotype was collected in Vietnam . Distribution. Vietnam . Remarks. Both this species and S. exigua are distributed in Vietnam . Although the male postabdomens of species are similar, they notably differ in the shape of the cerci and surstyli. In S. exigua , these structures are smoother, whereas in S. vietnamensis , they abruptly narrow at the apex.