Poecilosomella pilimana, Papp, 2002

Papp, L., 2002, Eighteen New Oriental Species Of Poecilosomella Duda (Diptera: Sphaeroceridae), Acta Zoologica Academiae Scientiarum Hungaricae 48 (2), pp. 107-156 : 135-137

publication ID	https://doi.org/ 10.5281/zenodo.12587600
persistent identifier	https://treatment.plazi.org/id/5B5787B6-5F68-FFF2-402A-78F4FB0932A2
treatment provided by	Felipe
scientific name	Poecilosomella pilimana
status	sp. nov.

Treatment

Poecilosomella pilimana View in CoL sp. n.

( Figs 42–45 View Figs 42–45 )

Holotype male ( ROM): INDONESIA: Sumatra, Aceh, Gunung Leuser Nat. Pk., Ketambe Res. Sta., 9–21 SEP 1989, DC Darling, ROM 893087 – 1 View Materials ° rainforest. Young forest , Terrace 3, closed canopy, 350 m, 3°41’N, 97°39’E, Malaise trap head GoogleMaps . Paratype: 1 female ( HNHM): same data as for the holotype GoogleMaps .

Measurements in mm: body length 2.20 (holotype), 2.51 (paratype), wing length 1.90, 1.95, wing width 0.90, 0.93.

Orbits, vertex and ocellar triangle dark, interfrontal stripe and other parts of frons red, face reddish yellow, genae dirty (greyish) yellow. Antennae yellow (pedicel and scape of paratype reddish). Longest aristal cilia 0.025 mm, cilia on apex of flagellomere slightly shorter. Two pairs of comparatively thick orbitals and two (on paratype female 3) pairs of short ifr. Genal seta only 0.10 mm.

Mesonotum with the usual pattern, anterior katepisternal seta longer than half length of posterior one. Scutellum basallyas wide as long.

Wings light brownish, dark brown spots at R 2–5 fork to R 1 , around apices of R 1 , R 2 +3, also a small dark spot on apex of R 4 +5; base of wing over vein H dark brown, in cell h subbasally a light spot present. Costa just overruns vein R 4 +5, yellow, brown on area of spots, other veins yellow. No vein appendage on R 2 +3. Second costal section 0.463 mm, third section 0.60 mm, ratio 0.77. Intercrossvein section of M/dMCu 0.20/ 0.143 mm, ratio 1.40 (holotype male). Halteres waxy yellow, knob greyish yellow .

Male fore femur ventrally with long hairs, fore tibia as well as three basal tarsomeres ventrally and anteriorly with extremely long fine hairs (longest hairs on tibia 0.225mm, on basitarsus 0.22mm). view, 45 = postgonite, lateral view. Scale: 0.2 mm for Figs 42, 44 View Figs 42–45 , 0.1 mm for Figs 43, 45 View Figs 42–45 Armature of mid tibia: anterodorsals: at 13/40 (strong), smaller anterodorsal proximad and at 5/6 (long and thick), posterodorsals: 12, 14, 17/40, a large at 3/4 and a dorsal at 3/4, no true anterior seta. Male mid tibia with fine (i.e. not thick and stiff) hairs longer than tibial diameter ventrally, no ventroapical seta, but ventroapical part of male mid tibia with a patch of ca. 10 short black setulae.

Epandrium dorsally with 1 pair of very long setae and elsewhere with several medium long setae. Sternite 5 ( Fig. 44 View Figs 42–45 ) strongly asymmetrical, broadly emarginated medially. Emargination not sclerotized, but with fine hairs. Sternite 6 ( Fig. 44 View Figs 42–45 ) with a narrow (short) medial sclerotized part. Sagittal part of sternite 6 with longer hairs, the less sclerotized broad medial parts with flat black scales and caudally with fine hairs. Medial part of subepandrial sclerite ( Fig. 42 View Figs 42–45 ) separated, with short black pegs but with a limited number of longer setae. Surstylus ( Fig. 43 View Figs 42–45 ) bilobed, anterior lobe broad with long setae, posterior lobe more narrow but rounded apically, there with a thick black tooth. Posterior lobe laterally with an extremely long curved, posteriorly directed spine (process), whose base bordered by 3 peculiar, angularly bent setae. Postgonite ( Fig. 45 View Figs 42–45 ) S-shaped, curved, with minute hairs only, apex rounded but narrow.

Female genitalia: epiproct shiny, pentangular with almost straight caudal margin and with a pair of 0.13mm (i.e. very long) hairs. Cerci dark brown with a pair of medial (0.13mm), 1 pair of long (0.163mm) apical and 3 pairs of shorter lateral hairs.

Distribution: Indonesia (Sumatra).

Etymology: It is named on the very long hairs of male fore tibia and tarsus.

P. pilimana sp. n. is a member of the P. punctipennis species-group. The male of this species exhibits the longest fore tibial and tarsal hairs, ventral hairs of mid tibia are fine and definitely longer than tibial diameter. The lateral, extremely long, curved process of the male surstylus makes it easily recognisable.