Imitomyia wangi Zhang & Li, 2024

Li, Junjian, Li, Yue, Nie, Xutong & Zhang, Chuntian, 2024, One new species of Imitomyia Townsend and five newly recorded species of Dexiinae (Diptera: Tachinidae) from China, Zootaxa 5448 (1), pp. 102-116 : 104-105

Imitomyia wangi Zhang & Li sp. nov.

( Figs. 1–8 )

Type material. Holotype ♂: CHINA, Baima Snow Mountains, elev. 4000 m, 27°24ʹ–28°36ʹN, 98°57ʹ–99°25ʹE, Deqin , Yunnan, 7.VII.2006, MF Wang ( SYNU) . Paratypes: 4♂, same locality as holotype, elev. 3800–4200 m, 5–7.VII.2006, MF Wang ( SYNU) .

Etymology. The specific name is taken from the family name of the collector of these specimens, Prof. Mingfu Wang, as a recognition for his great contributions to the knowledge of Chinese flies.

Distribution. China (Yunnan).

Diagnosis. Body small and black. Head triangular-like. Eye bare. Frons at most 1/12 of eye width. Face with a broad median carina. Hairs on posteroventral half of head black. Antenna with postpedicel about 1.2 times as long as pedicel, arista pubescent. Palpus black and 4–6 times as long as wide. Prementum and labella 1.14–1.17 times as long as head height. 2 presutural and 2 postsutural acrostichal setae, 2 supra-alar setae. Wing cell r 4+5 with a petiole at least as long as section of M beyond bend. Middorsal depression on abdominal syntergite 1+2 only on basal 1/3, tergites 3, 4 and 5 each with a complete row of long hair-like marginal setae and 1–2 irregular row of slender hair-like discal setulae.

Description. Body length: 2.9–4.3mm ( Figs. 1–2 ).

Male. Head ( Figs. 3–4 ) triangular, black in ground color, with gray pruinosity. Eyes bare, frons length 1.2–1.3 times of facial height, vertex at narrowest point about equal to anterior ocellar width, frons less than 1/12 of eyes width or about 0.4 of postpedicel width; frontal vitta black, linear at narrowest point from anterior to posterior part; Parafacial bare, about as wide as postpedicel, its inner and outer margins nearly paralleled, facial carina broad and high, upper surface flat, completely separating antennae; lower margin of facial protruding forward, visible in lateral view. Genal height 1/5–1/6 of eyes height, lower margin of gena nearly flat. Occiput with wholly black hairs or setulae, strongly inflated on posteroventral half. Postocular setulae slender and proclinate; 12 to 16 frontal setae slender, lowest one at level of scape base, upper one at narrowest point of frontal vitta, ocellar setae slender, 4–6 postocellar setae, inner vertical seta and outer vertical seta long hair-like, about as long as postocular setae; facial ridge with 3–4 setae lower 1/4, many slender subvibrissae present below slender vibrissa. Antenna short, black, situated at level of lower 3/7 of eyes falling to lower margin face about as long as pedicel; postpedicel 1.5–1.8 times as long as wide, 1.2–1.4 times as long as pedicel, outer dorsal surface of pedicel with 1 slender seta which nearly as long as antenna. Arista slightly longer than antenna, basal 1/3 thickened, pubescent, strongest aristal hairs slightly more than basal diameter width. Palpus black and short, 4–6 times as long as wide, its apex with 2 long setae which longer than palpi. Prementum and labellum specially elongated and nearly equal length and 1.14–1.17 times of head height.

Thorax black in ground color, with brownish gray pruinosity, 4 longitudinal thin black vittae on presutural scutum, postpronotal lobe and postalar callus black in ground color, 2 presutural and 2 postsutural acrostichal setae, 2 presutural and 3 postsutural dorsocentral setae, 0 presutural and 1–2 postsutural intra–alar setae, 1 short prealar seta, 2 supra-alar setae, 3 slender postpronotal setae arranged in a straight line. Scutellum black, with 2 pairs of marginal setae, apical scutellar setae crossed, which longer than scutellum; prosternum and proepisternum bare, 1 seta on upper front part of anepisternum and a row 6–7 setae on hind part of that, anterior and posterior thoracic spiracles dark brown and small, posterior lappets of the latter U-shaped. 2 slender hair-like anepimeral setae, at most to hind margin of upper calypters, 2 katepisternal setae, katatergite bare, meron with 3–4 slender setae on upper hind part. Wing brown, hyaline, calypters brown and dark brown on margin, divergent from scutellum, halters dark brown. Tegula and basicosta dark brown, relative lengths of costal sectors 2nd, 3rd and 4th approximately 2:8:3.5; base of vein R 4+5 bare dorsally and ventrally, R 4+5 closed with vein M forming a petiole at least as long as section of M beyond bend, section of M between dm-cu and bend of M about 3.2 to 4 times as long as section between bend of M and posterior margin of wing, section of M between dm-cu and bend of M 1 to 2 times section of M between crossveins r-m and dm-cu, dm-cu crossvein slightly longer than last part of Cu vein. Halter dark brown to black on distal half and brown to dark brown on basal half. Legs with femora and tibiae brown to dark brown, claws brown, claws and pulvilli shorter than 5th tarsomere, inner anterior surface of fore coxa predominantly bare, fore tibia with 1–2 posterior setae, preapical anterodorsal seta shorter than preapical dorsal seta, mid tibia with 1 anterodorsal, 2 posterodorsal and 1 ventral setae; hind tibia with 2–4 anterodorsal, 2 posterodorsal and 2 ventral setae, 3 preapical dorsal setae, preapical anteroventral seta distinctly longer than preapical posteroventral seta.

Abdomen wide ovate, black, with densely dark grayish pruinosity and mid-dorsal narrow black longitudinal vitta, syntergite 1+2 medially excavated only on basal 1/3, not extending to posterior margin, with a row of slender marginal setulae, an irregular row of hair-like discal setae; tergites 3 and 4 nearly equal in length, each with a complete row of marginal setae and 1(male) or 2 (female) irregular row of erect seta-like discal setulae. Tergite 5 about 1.1 (male) or 1.3 times (female) as long as tergite 4. Sternite 5 ( Fig. 8 ) with a V-shaped median cleft, its depth about 0.6 times of the sternite length, apex of lateral lobe bluntly round, with a U-shaped median depression on base. Abdominal sternites broadly exposed. Male terminalis as in Figs. 5–7 . In caudal view, cerci separated on discal 1/2, apex blunt on outer surface and slightly pointed on inner surface, surstyli short, situated at the level of basal 1/4–1/3 of cerci, slightly pointed at apex. In lateral view, apex of cerci slight bent posteriorly, surstylus small, pointed at apex. Aedeagal apodome, hypandrium, pegonite, postgonite and phallus in profile: aedeagal apodome slender, ejaculatory apodeme fan-shaped, distiphallus slender, plate-like, basiphallus short, postgonite short. Pregonite slightly pointed at apex, about as long as basiphallus in dorsal view.

Female. Unknown.

Remarks. This new species belongs to the tribe Imitomyiini ( Crosskey 1976: 43) and is treated as one species of Imitomyia Townsend, 1912 . It is closely similar to Imitomyia mica Richter (1976: 591) distributed in western Mongolia, but it is distinguished from the latter by the following characters: body larger, gena 1/5–1/6 of eyes height, prementum and labellum 1.14–1.17 times as long as head height, 2 presutural and 2 postsutural acrostichal setae, 2 presutural and 3 postsutural dorsocentral setae, section of M between dm-cu and bend of M about 3.2–4 times as long as section between bend of M and posterior margin of wing, abdominal tergites 3 and 4 each with a complete row of marginal setae and 1(male) or 2 (female) irregular row of slender hair-like discal setulae. tergites 5 at most 1.1 (male) or 1.3 (female) times as long as tergite 4.

Figures

FIGURES 1–8. Imitomyia wangi Zhang & Li sp. nov., male. 1–2. Body in lateral and dorsal views. 3–4. Heads in lateral and anterior views, 5–6. Ejaculatory apodeme, epandrium, cerci and surstyli in caudal and lateral views. 7. Phallus: Aedeagal apodeme, hypandrium, pregonite, postgonite, basiphallus, distiphallus in lateral view. 8. Sternite 5.