Allometopon suspirium, Owen Lonsdale, 2016

Owen Lonsdale, 2016, Revision of the genus Allometopon Kertész (Diptera: Clusiidae), Zootaxa 4106 (1), pp. 1-127 : 60

Allometopon suspirium spec. nov.

Figs 264–268

Description. General: ( Figs 264, 265 ) Body length 2.8–3.2mm. Arista short plumose. M1+2 ratio 3.9–5.6. First flagellomere broadly lobate ventrally, dorsum narrower but more produced. Female unknown.

Chaetotaxy: Three fronto-orbital setae with anterior seta slightly shorter. Ocellar and postvertical setae approximately as long as tubercle. Interfrontal seta absent. First flagellomere along distal margin with hairs longer than width of base of arista. Anterior dorsocentral half length of posterior dorsocentral. Acrostichal seta not much longer than surrounding setulae. One lateral scutellar seta.

Colour: Setae yellow, brown dorsally on abdomen. Head mostly light yellow, white below antenna; antenna yellowish-white to white, sometimes very faintly brownish dorsally on outer surface; arista white, brownish on distal half; ocellar tubercle dark brown; parafacial, gena and postgena silvery tomentose; back of head with incomplete brownish to orange stripes that radiate from foramen. Scutum yellow with anteromedial margin narrowly brown; with one pair of short, narrow, irregular light brown postsutural stripes with wider, pale-mottled base; anterior region of postsutural stripe sometimes faded ( Fig. 264 ); postpronotum and lateral margin of scutum paler. Scutellum yellow with lateral corner narrowly brown (faded if scutal stripe faded). Metanotum yellow with mediotergite light brown. Pleuron and legs yellowish-white. Wing dusky on distal half, slightly darker anteriorly. Halter white. Abdomen yellow with tergite 1 and lateral margin of tergites yellowish-white; tergites 2–6 and sternite 8 brown dorsally; sometimes dorsal stripe on tergites 2–5 narrows anteriorly on each tergite and has encloses a yellow anteromedial spot; epandrium dark brown with distal 1/4 yellow.

Male terminalia: ( Figs 266–268 ) Cerci fused, subtriangular. Surstylus as high as epandrium, broad at base and narrow and sinuate on distal half with apex rounded (slightly less sinuate in Sumatra male); inner-distal surface with cluster of tubercle-like setae. Hypandrium with long ventral lobe confluent with arm along length, with one apical seta. Phallapodeme well-developed, rod-like, with apex of ventral shield perpendicular to shaft. Pregonite and postgonite small, ovate, with several setae. Basiphallus short, stout, with small distoventral epiphallus. Distiphallus 2/3 length of phallapodeme. Paraphallus well-developed, minutely spinulose on dorsoapical half and along distolateral margin.

Etymology: The specific epithet is Latin for “sigh”, and refers to the faint colour pattern.

Distribution: Indonesia (E Kalimantan, Sumatra).

Holotype: INDONESIA. E. Kalimantan Kac. Pujungan, Kayan-Mentarang Nat. Reserve, D.C. Darling, vi–viii.1993, lowland diptero. forest WWF station, Lalut Biral vicinity of base camp, log emergence traps, 2°52′N, 115°49′E, 378m (1♂, MZB).

Material examined: INDONESIA. Sumatra, Aceh Gunung Leuser Nat. Pk., Ketambe Res. Sta., 3°41′N, 97°39′E, 1–31.xii.1989, D.C. Darling, 1° rainforest, young (T3) & mature (T4) forest, light gap and canopy, 350–400m, Malaise trap with pans (1♂, ROME), same collection as holotype (1♂, CNC), E. Kalimantan Kac. Pujungan, Kayan-Mentarang Nat. Reserve, D.C. Darling, ix–xi.1993, lowland diptero. forest WWF station, Lalut Biral vicinity of base camp, log emergence traps, 2°52′N, 115°49′E, 378m (1♂, MZB).

Comments: The genitalia of Allometopon suspirium are similar to those of A. malayensis ( Figs 179–181 ), but the surstylus of A. suspirium is sinuate and narrower apically but with the apex more broadly rounded, the distiphallus is larger and broader and the hypandrium is unusual in outline. Colouration is otherwise quite dissimilar.

Figures

FIGURES 264 – 268. Allometopon suspirium spec. nov.; 264: paratype (CNC) with paler scutal stripes, photo, dorsal; 265: same, lateral; 266: paratype (MZB), external genitalia, left lateral; 267: same, posterior; 268: internal genitalia, left lateral.

FIGURES 173 – 183. Allometopon malayensis Sasakawa; 173: paler female, photo, dorsal; 174: male, dorsal; 175: same, left lateral; 176: holotype, notum (from Sasakawa (1993 )); 177: darker female, photo, dorsal; 178: same, lateral; 179: Indonesian male, external genitalia, left lateral; 180: same, posterior; 181: same, internal genitalia, left lateral; 182: Malaysian non-type male, external genitalia, left lateral; 183: same, posterior.