Teuchophorus eurystigma, 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 : 187-188

Species 25: Teuchophorus eurystigma spec. nov. (male)

(figures 106–110)

Etymology. Gr. eurýs, ‘broad’, stígma, ‘a brand’.

Diagnosis. Small species with a short, but very broad, ovaloid costal stigma, whose distal apex does not reach the level of tp. Eyes touching just below middle of face. Third antennal segment short. Legs very poorly bristled; femora without ventral bristles.

Material examined. Type material: Thailand, Phang-Nga province : Phang-Nga, Tham Luk Sia, freshwater pool in cave, 12 April 1996,    male (No. 96072, leg. P. Grootaert) .

Male

Body length 1.2 mm; wing length 1.05 mm.

Head. Frons and face shining dark metallic green. Face rapidly narrowing downwards beneath antennae; eyes touching over a very short distance just below middle of face. Palpi small, brownish yellow, each bearing a small black apical bristle. Rostrum brownish yellow. Occiput shining greenish black. Chaetotaxy as usual; a pair of minute postocellars. Postocular cilia short, uniseriate, black. Antenna (figure 106): short; first and second segments brownish black; third segment brownish yellow, somewhat darkened dorsally. Second segment with short black marginal bristlets, longest above. Third segment roughly triangular, about as long as deep, with a subacute apex. Arista nearly four times as long as antenna, shortly pubescent; basal aristal segment as long as third antennal segment.

Thorax. Mesoscutum and scutellum shining dark metallic green, sidewards with a brownish hue. Pleurae partly dark brown, partly yellowish brown, with a metallic green gloss on mesopleura and metapleura; metapleura with a black spot anteriorly. Metanotum and underside of scutellum brown. Neck yellow. Acr uniseriate; five dc. No propleural bristle.

Legs. Legs, including coxae, yellow. Mid coxa with a vague indication of a dark longitudinal streak.

Fore leg. Coxa anteriorly with short pale hairs; at apex a row of four short brown bristles. Femur with a tiny preapical pv. Tibia about as long as femur, with a very short, inconspicuous anterodorsal serration. Length of tibia and tarsal segments (in mm): 0.35: 0.175: 0.1:0.075: 0.05: 0.06.

Mid leg. Coxa anteriorly and at apex with short pale hairs. Femur with a preapical av and a preapical pv, both very short. Tibia a little longer than femur; two ad, one pd; a few very short apicals. Length of tibia and tarsal segments (in mm): 0.5:0.225:0.125:0.1: 0.055:0.07.

Hind leg. Coxa with a weak black exterior bristle. Femur (figure 107) with a very small preapical av. Tibia (figure 107) a little longer than femur; one dorsal bristle just beyond middle; one very weak preapical dorsal bristle. First tarsal segment slightly thickened, at apex obliquely cut off, with a very short pale fringe. Length of tibia and tarsal segments (in mm): 0.5:0.1:0.15:0.1: 0.065:0.06.

Wing. Wing (figure 108) hyaline, slightly brownish tinged. Costa with a remarkable, short, but very broad, ovaloid dark brown swelling, that is rounded at base (figure 109). The lower edge of this stigma is evenly curved, enclosed by r1. The tip of this stigma does not reach the level of tp. r4+5 and m1+2 slightly diverging apically. Ratio of basal and apical parts of m1+2 about 1:2. No anal vein; only a weak fold. Halters yellow. Squamae yellow, with narrowly darkened tips, and blackish cilia.

Abdomen. Abdomen dorsally dark brown, feebly shining. Hairs and marginal bristles on terga black, very short. Venter brown. Hypopygium (figure 110) moderately large, brown, partly dark brown; cerci yellowish.

Female Unknown.

Discussion

By its strongly enlarged costal stigma, its small size, and its feebly bristled legs this species comes near to T. pusio Mf. & Gr.