Poecilosomella brevisecunda, Papp, 2002

Papp, L., 2002, Eighteen New Oriental Species Of Poecilosomella Duda (Diptera: Sphaeroceridae), Acta Zoologica Academiae Scientiarum Hungaricae 48 (2), pp. 107-156 : 120-122

Poecilosomella brevisecunda sp. n.

( Figs 16–19 )

Holotype male ( ROM): INDONESIA: Sumatra, Aceh, Gunung Leuser Nat. Pk., Ketambe Res. Sta., 9–21 SEP 1989, DC Darling, ROM 893087 – 1 ° rainforest. Young forest , Terrace 3, closed canopy, 350 m, 3° 41’N, 97° 39’E, Malaise trap head.

Paratypes: 1 male ( HNHM): ibid., 3–10 SEP, B Hubley, DC Darling, ROM 893027 ; 1 male ( ROM): ibid., 7 SEP, ROM 893059 – 1 ° rainforest, 350 m, 3°41’N, 97°39’E. Screen sweep ; 1 female ( ROM): ibid., B Hubley, DC Darling, ROM 893045 – Mature forest , Terrace 4, light gap, 400 m .

Measurements in mm: body length 1.85 (holotype), 1.55–1.80 (paratype males), 2.00 (paratype female), wing length ca. 1.87 (holotype), 1.57–1.95 (paratypes), wing width 0.86 (holotype), 0.85–0.95 (paratypes).

A single strong, posterior, 0.18 mm long orbital seta present, anterior one hair-like and hardly longer than diameter of the posterior one at base. Facial plate shiny reddish yellow. Antennae reddish, first flagellomere enlarged but less than in P. hayashii , 0.125 mm, scape and pedicel combined 0.103 mm long. Arista 0.05+ 0.50 mm long, aristal cilia 0.04 mm, cilia on flagellomere slightly shorter than 0.02 mm. Two pairs of thin and short ifr setae.

Mesonotum blackish brown, almost dull, with 4 sagittal, 4 dorsocentral and 3 lateral silvery spots. Scutellum somewhat wider than long, with 5 silvery spots.

Costal vein terminates at R 4+5, vein R 2+3 meets costa perpendicularly. Second costal section about 3/5 length of third section (not precisely measurable on downcurved wings). Wings without vein appendage on R 2+3 subapically. Second costal section much shorter than third, costa terminates at vein R 4+5. Wings completely dark, only cross-veins light, no light spot amidst cell r2+3, as in hayashii . Knob of halter dark brown, stalk yellow.

Legs dark brown, except for the following: apices of femora yellowish, all tibiae with broad medial and apical light rings. Basal 3/4 of fore basitarsus and the whole 5th tarsomere dark, other parts of fore tarsus white. Mid tarsus white at apices of basitarsus and 2nd tarsomere, as well as whole 3rd tarsomere white, other parts dark. Hind basitarsus and 2nd tarsomere enlarged and thickened but in a less extent than in HAYASHIi , only 3rd hind tarsomere white. Fore tibia thickened but less than in P. hayashii . Mid tibia with a strong anterior seta at 11/20, anterodorsals at 1/4 and 17/20, posterodorsals at 1/5, 9/20 and 3/4, and a strong mid ventral seta distally to the middle (at 13/20). Male mid tibia without long hairs. No true ventroapical on mid tibia, 3 small black setae instead, though the longest one longer than basitarsal diameter.

Sternite 5 slightly asymmetrical, the complex of sternite 5 & 6 ( Fig. 19 ) with at least 3 rows of long thin hairs on a rather broad median part. Epandrium with comparatively short setae. Subepandrial sclerite ( Fig. 18 ) peculiar with a pair of sclerotized and black melanized inner processes and with a pair of rather long, knobbed, rounded, hairy, ventral (outer) processes. Male surstylus ( Fig. 16 ) comparatively long, anterior and posterior lobes not clearly separated but with a posterior, rather ventral tooth. Postgonite ( Fig. 17 ) rather short, apical third strongly curved, with two small apical view. Scales: 0.1 mm for Figs 16–18 , 0.2 mm for Fig. 19

projections over its narrowly rounded apex. Distiphallus shorter than aedeagal apodeme, without any conspicuous (melanized) sclerotization, apically upcurving.

Female terminalia not studied in detail; both epiproct and hypoproct rather short, female cerci with 2 pairs of rather straight medium long hairs, i.e. shorter than in P. hayashii .

Etymology: The name of this species refers to its rather short second costal section. Distribution: Indonesia (Sumatra).

P. brevisecunda sp. n. is an easily recognisable species; it is probably closely related to P. hayashii sp. n. However, not only is the second costal section comparatively short, but vein R 2+3 meets the costa perpendicularly. Anterior orbital seta reduced to a minute hair (see more in key).

Figures

Figs 16–19. Poecilosomella brevisecunda sp. n., paratype male. 16 = surstylus, lateral view, 17 = postgonite, 18 = subepandrial sclerite, caudal view, 19 = sternite 5 and pregenital sternites, ventral