Paravibrissina parvula, 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 : 55-56

Paravibrissina parvula sp. nov.

Figs. 19–22 , 24 .

Recognition. This species closely resembles P. pacifica in general appearance, but is smaller and lacks median marginal setae on the abdominal syntergum 1+2. The male terminalia of this species have broad and short cerci, which differ from the rather narrow and slender cerci in P. pacifica .

Description. Closely resembling S. pacifica , but differing as follows:

Male. Vertex slightly narrower than 1/5 of head width (about 0.19); parafacial about 1/2 as wide as 1st flagellomere at middle height; gena about 1/5 of eye height, with occipital dilation on lower 1/2. Inner vertical seta about 2/3 as long as eye height; ocellar seta absent; 2 reclinate orbital setae, anterior seta slightly longer than posterior seta and about 3/4 as long as inner vertical seta; 8–10 frontal setae, upper 1–2 setae strong and reclinate; gena with a row of 3–4 long and strong setae and several fine hairs. Antenna falling short of lower margin of face by about 2/3 length of pedicel; 1st flagellomere about 2.5 times as long as pedicel.

Thoracic dorsum with 4 narrower longitudinal black vittae on presutural area, scutellum black on basal 2/ 3. Distance between bases of 2 subapical scutellar setae about 2/3 of that between subapical and basal setae of corresponding side.

Wing hyaline, well tinged with brown on anterior and basal portions. Second costal sector about 3/5 as long as 3rd and nearly subequal in length to 4th.

Abdominal syntergum 1+2 without median marginal setae; 3rd tergum with 2 strong median marginal setae; 4th tergum with a row of strong marginal setae; 5th tergum with a row of discal and marginal setae; discal setae absent on 3rd and 4th terga; venter of 4th tergum with hair patch of short and fine hairs on quadrate area of entire length, 5th tergum without hair patch. Male terminalia: 5th sternum with U-shaped median cleft, posterior lobe only slightly less than 1/2 of whole length of the sternum; 6th tergum of 2 small hemitergites, each with a long hair; cerci in dorsal view short and wide, strongly narrowed to apex, narrowly separated from each other on apical 1/5 and converging at apex, in lateral view weakly curved dorsally on apical 1/5; surstylus in lateral view weakly curved dorsally near middle, about 2 times as long as wide, with several short fine hairs; pregonite bare.

Female. Unknown.

Body length: 5mm.

Distribution. New Caledonia.

Holotype. Male, NEW CALEDONIA: Hiengen to Bourail, 23.ii. 1978, H. Shima (BPBM).

Etymology. Specific name refers to the smaller size of this species in comparison to the similar and also sympatric species, P. pacifica .

Figures

FIGURES 19 – 22. Paravibrissina parvula sp. nov. 19. Epandrium, cerci and surstylus in dorsal view (hairs omitted). 20. Same in lateral view (hairs on epandrium and cerci omitted). 21. Hypandrium, pregonite, postgonite and aedeagus in lateral view. 22. Male 5 th sternum in ventral view (hairs omitted on left side). Scale bars for 19 – 21 and 22 = 0.1 mm.

FIGURES 23 – 24. Male 5 th abdominal sternum, 6 th tergum, 6 th sternum and syntergosternum 7 + 8 in posterolateral view. 23. Paravibrissina pacifica sp. nov. 24. P. parvula sp. nov. Scale bars = 0.1 mm.