Parerigone atrisetosa, Wang, Qiang, Zhang, Chuntian & Wang, Xinhua, 2015

Wang, Qiang, Zhang, Chuntian & Wang, Xinhua, 2015, Review of the genus Parerigone Brauer (Diptera: Tachinidae) with five new species from China, Zootaxa 3919 (3), pp. 457-478 : 461-463

Parerigone atrisetosa sp. nov.

( Figs. 1–4 , 21–24 , 41 )

Diagnosis. Body broad, covered with dense golden yellow pruinosity. Vertex 0.21–0.23 (male), 0.3 (female) of head width; gena 0.34–0.36 of eye height in both sexes; all thoracic hairs black in male, yellowish hairs on pleura in female; abdomen black in ground color, hairs on dorsum black in male, yellowish on lateral and ventral parts of tergites in female; legs black in both sexes.

Description. Body length: 11.0– 12.5 mm.

Male. Head black in ground color, parafacial and gena reddish, fronto-orbital plate brown to black, frontal vitta reddish brown to black, genal dilation reddish brown, lower face pale yellowish; fronto-orbital plate, parafacial, face, gena and genal dilation covered with grayish yellow pruinosity, occiput with pale yellow or yellowish white hairs and 2–3 short black hairs behind postocular seta, covered with yellowish white pruinosity; antenna brown to dark brown, basal 1/8 of 1st flagellomere reddish brown; palpus reddish yellow. Vertex 0.21–0.23 of head width; frontal vitta 1.7–2.0 times as wide as fronto-orbital plate at middle; parafacial 0.8–0.9 times as wide as 1st flagellomere at middle height; face weakly concave, lower margin strongly protruded forward, extending beyond base of vibrissa; gena 0.34–0.36 of eye height. Inner vertical seta long, 0.73–0.75 of eye height; outer vertical seta hair-like or indistinguishable from postocular setae; ocellar seta fine, 0.45–0.50 times as long as inner vertical seta and with several fine black hairs on ocellar triangle; 2 postocellar setae, 0.43–0.45 times as long as inner vertical seta; 2 post vertical setae, 0.35–0.40 times as long as inner vertical seta; 8 long frontal setae, lowest seta nearly level with basal of pedicel; fronto-orbital plate with only several fine black hairs among row of frontal setae; vibrissa inserted above level of lower margin of face; facial ridge with 2–3 setae and several fine short hairs at most on lower 1/5; 4–5 rather long subvibrissal setae. Antenna falling short of lower margin of face by about 1.4 times of pedicel length; pedicel bearing black hairs and a long seta, the latter 0.9–1.0 times as long as pedicel; 1st flagellomere 1.7–1.9 times as long pedicel; arista with micro-pubescence, 3rd aristomere thickened on basal 2/7.

Thorax black in ground color, with dense golden yellow pruinosity; dorsum with 4 narrow longitudinal vittae, outer vittae about twice as wide as inner vittae and about 0.25 times as wide as pruinose portion between inner and outer vittae; pleura with dense pale yellowish white or grayish white pruinosity. All thoracic hairs black, fine short and suberect; anatergite bare; 2 presutural and 3 postsutural acrostichal setae; 3 presutural and 3 postsutural dorsocentral setae, scutellum with 4 pairs of marginal setae and 1 pair of rather fine long discal setae, the latter about as long as scutellum, basal, lateral and subapical setae subequal in length and 1.6–1.7 times as long as scutellum, apical seta about 1.4 times as long as scutellum, sometimes 1 rather fine long hair inserted before basal seta.

Wing hyaline, evenly and weakly tinged with pale yellow on basal and anterior margins; basicosta reddish brown to black; lower calypter pale yellowish on middle and yellowish on margin. Costa between subcosta and vein R1 about 0.4 times as long as that between R1 and R2+3; bend of vein M nearly right angled, vein M from dm-cu crossvein to its bend 2.0–2.1 times as long as distance between the bend and wing margin extending along vein M.

Legs black, pulvilli yellowish brown; legs hairs black; fore tibia with 4 fine anterodorsal and 2 strong posterior setae; mid tibia with 2 anterodorsal, 2 posterodorsal and 1 ventral setae; hind tibia with 2–4 strong submedian anterodorsal setae among them, if 4 setae present then upper and the 3rd setae fine, 2–4 posterodorsal setae, if 4 setae present then upper and the 3rd setae fine, and 2–4 strong anteroventral setae, if 4 setae present then upper 2 setae fine, and with 2 preapical dorsal setae.

Abdomen broad ovate, black in ground color, entirely covered with dense golden yellow pruinosity, irregular spots appearing with direction of light on dorsum of syntergite 1+2 to 5th tergite. Hairs on dorsum black, fine long and suberect; syntergite 1+2 excavated half way to posterior margin, with 2 strong median marginal and 1–2 lateral marginal setae; 3rd tergite with 2 strong median discal and a row of 8 marginal setae; 4th tergite with 2 strong median discal and a row of 12 strong marginal setae; 5th tergite with a row of median discal and marginal setae.

Male terminalia. Fifth sternite ( Fig. 23 ) broadly V-shaped in ventral view, broadly excavated posteromedially, without membranous area anterior to the excavation, with fine and long hairs on posterior lobe; cerci ( Fig. 21 ) in dorsal view narrowly separated as V-form on apical 2/3, lateral margin nearly straight, with dense long and strong hairs, apex pointed, in lateral view dorsal margin arced and ventral margin excavated near middle, dorsal area with dense fine long hairs; surstylus ( Fig. 22 ) long, rounded apically, in lateral view dorsal margin nearly straight and ventral margin strongly bulged, basal 1/3 strongly inwardly concave, apex with dense and short hairs; bacilliform sclerite short; pregonite nearly straight from base to apex; postgonite overlapping pregonite on basal 1/3; distiphallus elongate, distal area expanded laterally; ejaculatory apodeme long, nearly fan-shaped ( Fig. 24 ).

Female. Differing from male as follows: Fronto-orbital plate, parafacial, face, gena and genal dilation covered with golden yellow pruinosity; palpus reddish yellow; vertex about 0.3 of head width; frontal vitta about as wide as fronto-orbital plate at middle; 3 strong reclinate orbital setae, middle one rather strong and about 0.85 times as long as inner vertical seta; 7 rather strong frontal setae; ocellar seta black, hair-like, several black long hairs on ocellar triangle; hairs on pleura yellowish; mid tibia with 2 anterodorsal, 3 posterodorsal and 1 ventral setae; claws and pulvilli shorter than 5th tarsomere; hairs on lateral and ventral portion of abdomen tergites yellowish. Female terminalia ( Fig. 41 ). Sixth tergite long and broad; 6th sternite long and broad, flat posteriorly; 7th tergite long and broad; 7th sternite long, divided into two elongate lobes on posterior portion; 8th tergite short, rounded apically; 8th sternite long and strongly sclerotized, posterior portion strongly curved ventrally and forming a piercer.

Holotype male, Maolan, Libo, 850–1080 m, Guizhou, China, 20–21.v.2011, C.T. Zhang (SYNU).

Paratype. CHINA: 1 female, Dongshanpo Forestry Centre, Jingyuan, 2200–2300 m, Ningxia, 28.vi.2008, J.Y. Liu (SYNU).

Etymology. Specific name is taken from the black hairs on thoracic and abdominal dorsum of this species.

Remarks. Parerigone atrisetosa is one of five species in the genus with 4 pairs of scutellar marginal setae and 1 ventral seta on mid tibia in male, the other species being P. aurea , P. brachyfurca , P. eristaloides and P. tianmushana . Within this group of five species, P. atrisetosa and P. aurea are the only two with mostly dense yellowish or golden yellow pruinosity on the body and pedicel of antenna bearing black hairs. Parerigone atrisetosa differs from P. au re a in having black thoracic hairs, legs and abdomen with black hairs.

Distribution. China (Guizhou, Ningxia).

Figures

FIGURES 1 – 4. Parerigone atrisetosa sp. nov., male. 1. Body in dorsal view. 2. Body in lateral view. 3. Head in lateral view. 4. Head in anterior view.

FIGURES 21 – 24. Male terminalia of Parerigone atrisetosa sp. nov. 21 – 22. Epandrium, cerci and surstyli. 21. Caudal view. 22. Lateral view. 23. Sternite 5 in ventral view. 24. Aedeagal apodeme, ejaculatory apodeme, hypandrium, pregonite, postgonite, basiphallus, distiphallus in lateral view. Scale bars = 0. 25 mm.

FIGURES 41 – 44. Female terminalia in lateral view. 41. Parerigone atrisetosa sp. nov. 42. Parerigone flava sp. nov. 43. Parerigone flavisquama sp. nov. 44. Parerigone laxifrons sp. nov. Scale bars = 0. 25 mm.