Paravibrissina leucogaster, Shima, Hiroshi & Tachi, Takuji, 2008

Shima, Hiroshi & Tachi, Takuji, 2008, New species of the genus Paravibrissina Shima (Diptera: Tachinidae) from Southeast Asia and South Pacific, Zootaxa 1870, pp. 43-60 : 51-53

Paravibrissina leucogaster sp. nov.

Figs. 10–14 , 28 , 30 .

Recognition. This species resembles P. argentifera at a glance, but differs from it in having 4 postsutural dorsocentral setae instead of 3 and lacking ventral seta on the mid tibia. The female terminalia resemble those of S. argentifera . Eggs lack reticulation on the chorion surface and marginal ring bears many spinules.

Description. Male. Head with dark grayish pollinosity on fronto-orbital plate, parafacial, gena and face, pollinosity appearing more whitish on parafacial and face when seen from above; interfrontal area velvety dark brown; occiput dark brown; antenna dark brown to black; palpus black. Vertex about 1/7 of head width; interfrontal area widened anteriorly, slightly wider than fronto-orbital plate at middle; parafacial well narrowed below, about 1/2 as wide as 1st flagellomere at middle height; gena slightly less than 1/5 of eye height, with occipital dilation on lower 1/2; facial ridge rather weakly bulged. Inner vertical seta about 1/2 as long as eye height; outer vertical seta absent; 2 reclinate orbital setae, anterior seta slightly longer than posterior one and about 3/4 as long as inner vertical seta; 8 frontal setae, uppermost seta reclinate and lowest seta nearly level with lower margin of pedicel, a row of 3–4 strong setae present outside row of frontal setae at level of base of antenna; facial ridge with strong downcurved setae on lower 3/5 and with a row of several fine setulae outside row of strong setae; gena with several fine and long hairs; occiput with dense fine short black hairs, pale hairs confined on posteromedian portion. Antenna falling short of lower margin of face by about 1/3 length of pedicel; 1st flagellomere about 3.5 times as long as pedicel; arista thickened on basal 1/4. Palpus about 4/5 as long as 1st flagellomere, weakly widened on apical 2/3 and flattened, with dense short setulae on its entire length. Eye with dense long hairs.

Thorax shining black in ground color, with grayish brown pollinosity on postpronotal lobe, notopleural area and most part of pleura; when seen from behind dorsum with two narrow longitudinal vittae of brownish pollinosity on presutural area of scutum and transverse band of brownish pollinosity on posterior 1/2 of postsutural scutum; scutellum with dark brownish pollinosity when seen from behind. Four postsutural dorsocentral setae; 3 katepisternal setae; distance between bases of two subapical scutellar setae about 3/4 of that between subapical and basal setae of corresponding side; 1 fine lateral scutellar seta present, about as long as scutellum.

Wing pale brownish hyaline, more brownish basally; tegula and basicosta black; lower calypter brownish. Second costal sector about 4/7 as long as 3rd and slightly shorter than 4th; bend of vein M about 1.5 times closer to wing margin than to r-m crossvein.

Legs black; pulvilli pale brownish. Fore tibia with 1 posterior seta; mid tibia with 1 anterodorsal and 2 posterodorsal setae, without ventral seta; hind tibia with 2 preapical dorsal setae; claws and pulvilli longer than 5th tarsomeres.

Abdomen dark brown in ground color, black on syntergum 1+2, reddish on sides of 3rd and 4th terga, with dense whitish pollinosity on dorsum of 3rd to 5th terga, the pollinosity appearing silvery with direction of light; venter with very thin pale brownish pollinosity. Hairs on dorsum rather dense short fine and suberect, stronger and erect on mid dorsal area, on venter fine and dense; a pair of small roundish hair patches on venter of 5th tergum; syntergum 1+2 with 2 median marginal setae; 3rd tergum with 3–4 irregularly set median discal and 2 strong median marginal setae; 4th tergum with 2 median discal and a row of strong marginal setae; 5th tergum with regular rows of strong discal and marginal setae. Male terminalia: 5th sternum with median cleft U-shaped, posterior lobes about 2/5 of whole length of the sternum; 6th tergum absent; cerci in dorsal view narrowed to apex, narrowly separated on apical 1/5 and converging apically, in lateral view curved dorsally on apical 1/4; surstylus in lateral view about 1.5 times as long as wide, rounded apically, with several fine hairs; pregonite with only 2 fine short hairs.

Female. Resembling male, but differing as follows: Parafacial and face with more whitish pollinosity; vertex wider, slightly less than 1/5 of head width; 2 strong proclinate orbital setae, subequal in length and slightly shorter than inner vertical seta; 1st flagellomere about 3 times as long as pedicel; palpus clavate with dense short setulae; fore tibia with 2 posterior setae; mid tibia with 1 ventral seta; claws and pulvilli shorter than 5th tarsomere; abdomen broadly reddish brown in ground color, mid dorsal longitudinal portion weakly darkened; abdominal hairs recumbent, 3rd and 4th terga each with 4 median discal setae; venter of 5th tergum without hair patches. Female terminalia: 6th tergum of small hemitergites, with several strong hairs posteriorly; 7th tergum of small hemitergites, longer than 6th hemitergite, with a row of hairs on posterior margin; 8th tergum of small semi-circular hemitergites; 8th sternum very small; epiproct absent.

Body length: 5.7–6.2mm.

Holotype. Female, INDONESIA: Mt. Topidi nr Malino, 1350 m, Sulawesi, 18.vii. 1994, D. Tikuliling (MZB).

Paratypes. INDONESIA: 1 male, 1 female, same data as holotype (BLKU, MZB).

Distribution. Indonesia (Sulawesi).

Etymology. Specific name is taken from the characteristic silvery white abdomen of this species.

Figures

FIGURES 10 – 14. Paravibrissina leucogaster sp. nov. 10. Epandrium, cerci and surstylus in dorsal view (hairs omitted). 11. Same in lateral view (hairs on epandrium and cerci omitted). 12. Hypandrium, pregonite, postgonite and aedeagus in lateral view. 13. Male 5 th sternum in ventral view (hairs omitted on left side). 14. Female terminalia in lateral view. Scale bars for Figs. 10 – 12 and 13 = 0.1 mm, for Fig. 14 = 0.2 mm.

FIGURES 25 – 28. Eggs and 1 st instar larva. 25. Paravibrissina adiscalis Shima (left below, anterior portion of 1 st instar larva; right below, part of marginal ring). 26. P. argentifera sp. nov. (chorion somewhat deformed and marginal ring removed with treatment of KOH solution). 27. P. aurigera sp. nov. 28. P. leucogaster sp. nov.

FIGURES 29 – 34. 29. Paravibrissina argentifera sp. nov., male, dorsal view. 30. P. leucogaster sp. nov., male, dorsal view. 31. P. aurigera sp. nov., female, dorsal view. 32. Same, lateral view of head. 33. P. pacifica sp. nov., male, dorsal view. 34. Same, lateral view of head.