Asiorrhina asiatica ( Senior-White, 1922 ) Senior-White, 1922

Blagoderov, Vladimir, Hippa, Heikki & Ík, Jan Šev Č, 2009, Asiorrhina, a new Oriental genus of Lygistorrhinidae (Diptera: Sciaroidea) and its phylogenetic position, Zootaxa 2295, pp. 31-45 : 37-40

Asiorrhina asiatica ( Senior-White, 1922) , comb. n.

Lygistorrhina asiatica Senior-White, 1922: 196

Material studied. Holotype: Male, Ceylon, Suduganga, 20/4/1920, R. Senior-White, on window, 7 am; pinned male, moulded, thorax and one wing preserved, abdomen glued on plastic next to minuten ( BMNHE 254360). Other material: Male, Ceylon, Suduganga, 21/6/1922, R. Senior-White; slide mount in Canada balsam; male ( BMNHE 819008); Suduganga, 5.vi. 1922., on window, R. Senior-White; slide mount in Euparal ( BMNHE 819007); all in BMNH.

Description. Male. Measurements: Head height 0.34–0.38 mm (holotype 0.34); body without head 2.7- 3.2 mm; wing, measured from humeral vein, 1.5–1.7 mm (holotype 1.5); antenna 1.0 mm; proboscis 0.8 mm; palpus 0.5 mm.

Head ( Fig. 2 A) rounded, slightly wider than high. Frons, vertex and occiput uniformly dark brown, covered with short setae. Three ocelli in triangle, diameter of lateral ocellus 1.8x diameter of median one. Frontal furrow surrounds median ocellus and continues on vertex. Eyes dichoptic, oval, without emarginations. Ommatidia round, equal in size, 19-20 ommatidia across eye, with interocular setae as long as diameter of ommatidium. Antennae set a little lower than middle of head. Scape very short, obovate, dorsal side longer than ventral; pedicel spherical. Flagellum 14-segmented, flagellomeres with polygonal setal pattern ( Fig. 3 A). Flagellomeres cylindrical, slightly compressed laterally. Scape, pedicel and flagellomeres 1–13 with long dorsal setae spread widely apart; flagellomeres 1–9 with short, thick ventral setae. Flagellomere 1 length 0.9x width, flagellomere 4 width 0.5x length in lateral view ( Fig. 3 A) and 1.7x width in dorsal view, apical flagellomere length 2x width in lateral view and 3.5x width in dorsal view; apical appendage on flagellomere 14 weak ( Fig. 3 B). Clypeus as long as wide, with 8-9 dorsal setae. Length of proboscis approximately 2x height of head. Palpi one-segmented, 0.65x length of proboscis, narrow at base, evenly tapering towards apex, with setae spread out in basal third and single row of setae in apical 2/3. Labellum same width through whole length, uniformly covered with short setae and microtrichia (except extreme apex), rounded at apex.

Thorax. Scutum moderately convex, uniformly covered with short setae, with longer lateral setae in irregular row and a few stronger dorsocentral setae. Scutellum with 6 pairs of long setae. Antepronotum divided from proepisternum with distinct suture, bearing 9–10 setae, proepisternum with 8–9 setae. Laterotergite medium size, defined, with 10–11 setae in central part.

Legs. Fore coxae densely setose anteriorly, with 3–4 postero-apical setae. Mid coxa densely setose on apical third. Hind coxa with a row of 6–7 postero-lateral setae and a row of 5 latero-apical setae. Tibial organ on fore tibia without horseshoe-shaped sclerotized crest ( Fig. 4 B). Mid tibiae not preserved on studied specimens. Hind tibia gradually slightly expanding towards apex, hind tibial spurs subequal. All tarsal claws pointed.

Wing ( Fig. 5 A). Costal setae about 2x width of Costa. R with 29-30 dorsal setae, other veins bare. R5 slightly sinusoid. M stem and base of fork M1 and M2 reduced, M2 extends more basally than M1. M1 and M2 gently curved posteriorly, slightly diverging, so M1 ends at wing apex. M3+4 and CuA strongly curved posteriorly, M3+4 slightly sinuous apically. Distance between apices of M2 and M3+4 1.3x distance between M3+4 and CuA. Vein iCu strong, vein A1 not apparent.

Abdomen. Tergite 8 elongated, slightly pointed at apex, with long setae in apical half. Tergite 9 pearshaped ( Fig 6 A), a little longer than gonocoxites; evenly covered dorsally with long setae, with a group of densely spaced short setae at apex. Gonocoxites wide ventrally in apical half, irregularly setose ( Fig. 6 B). Gonostylus shorter than gonocoxite, with two blunt, apical lobe-like teeth (the ventral one being slightly longer), and a thin, long medial flagellate seta at the middle of mesial margin ( Fig. 6 C).

Differential diagnosis. For characters distinguishing A. asiatica from A. parasiatica , see under the latter.

Figures

FIGURE 2. Male head, frontal view. A: Asiorrhina asiatica (Senior-White), comb. n.; B: Asiorrhina parasiatica, sp. n. (holotype).

FIGURE 3. Antenna (C), antennal flagellomere 4 (A, D) and antennal flagellomere 14 (B, E), lateral view. A, B. Asiorrhina asiatica (Senior-White). C – E. A. parasiatica sp. n., (holotype); scale 0.1 mm.

FIGURE 4. Thorax, lateral view, (A) and tibial organ (B, C) of Asiorrhina. A, C: Asiorrhina parasiatica, sp. n. (holotype); B: Asiorrhina asiatica (Senior-White), comb. n.

FIGURE 5. Wings, dorsal view. A: Asiorrhina asiatica (Senior-White), comb. n.; B: Asiorrhina parasiatica, sp. n.; scale 0.5 mm.

FIGURE 6. Asiorrhina asiatica (Senior-White), comb. n. A: Hypopygium, dorsal view; B: Hypopygium, ventral view; C: Gonostylus, ventral view; scale for A, B 0.1 mm, for C 0.05 mm.