Teuchophorus ensicornis, Meuffels & Grootaert, 2004

Meuffels, Henk & Grootaert, Patrick, 2004, The genus Teuchophorus in South-East Asia and New Guinea, description of new species, species-groups and their phylogeny (Insecta, Diptera, Dolichopodidae), Journal of Natural History 38 (2), pp. 143-258 : 180-182

Species 17: Teuchophorus ensicornis sp. nov. (male)

(figures 93–96)

Etymology. The name ensicornis [Lat. ensis, ‘sword’, cornu, ‘horn, antenna’] alludes to the very long third antennal segment, shaped like a knife blade.

Diagnosis. Small species. Has the same very long antenna as T. gladiator sp. nov., but its hind legs are not deformed. Eyes separated by narrow face. Costa not thickened.

Material examined. Type material: Brunei, Kuala Belalong , Temburong river,    male, 17 April 1993 river in primary rain forest (No. 93025, leg. P. Grootaert) .

Male

Body length 1.45 mm; wing length 1.4 mm.

Head. Frons broad, with brownish black ground colour, feebly shining. Face brownish black, at its narrowest point about two or three times as wide as the distance between the two ocellar bristles. Palpi small, rounded, yellow, with a small black apical bristlet. Rostrum yellow. Occiput brownish black. Chaetotaxy as usual; two small postocellars. Postocular cilia very short, uniseriate, black. Antenna (figure 93): very long, brown; first segment and lengthened apex of third segment lighter coloured. First segment very small, second segment cup-shaped, short, with a circlet of very short bristlets, that are longest above. Third segment with a long, pointed apex. Arista inserted on tip of basal part of third antennal segment, about one-third times as long as antenna.

Thorax. Mesoscutum and scutellum glossy brown. Pleurae yellowish brown, with a small black spot on metapleurae. Chaetotaxy as usual; acr uniseriate. Scutellum with two marginals. No propleural bristle.

Legs. Legs and coxae yellow.

Fore leg. Coxa anteriorly with sparse short brownish hairs and towards apex with a row of short brownish setae. Femur with a minute preapical pv. Tibia without bristles or serration. Length of tibia and tarsal segments (in mm): 0.29: 0.11:0.05:0.045:0.04: 0.05.

Mid leg. Coxa with few short brownish hairs. Femur with two very short brownish preapical pv, and a very small preapical av. Tibia with one ad and one pd on basal third; ventrally on apical half a row of slightly lengthened hairs; apical crown consisting of one short and two somewhat longer bristles. Length of tibia and tarsal segments (in mm): 0.45: 0.2:0.11: 0.08:0.06:0.06.

Hind leg (figure 94). Coxa with a small black exterior bristlet. Femur with a thin av near apex, hardly as long as diameter of femur. Tibia posteriorly with a row of slightly lengthened hairs; at apical rim posteriorly a small spinule; two or three short dorsal bristles on apical two-fifths. Tarsus a little thickened (especially so the first segment), but not deformed. Length of tibia and tarsal segments (in mm): 0.47: 0.08:0.14:0.08: 0.05:0.04.

Wing. Wing (figure 95) hyaline. Costa not thickened. r4+5 and m1+2 diverging apically. Halters brownish yellow. Squamae small, dark brown, with brown cilia.

Abdomen. Abdomen light brown; venter yellowish. Hairs and bristles extremely short, dark. Hypopygium (figure 96) very small, brown.

Female Unknown.

Discussion See under T. gladiator sp. nov.