Teuchophorus bulohensis, Grootaert, 2006

Grootaert, Patrick, 2006, The Genus Teuchophorus (Diptera: Dolichopodidae) In Singapore, Raffles Bulletin of Zoology 54 (1), pp. 59-82 : 77-78

Teuchophorus bulohensis , new species

( Figs. 45-47 )

Material examined. – Holotype male: SINGAPORE: Sungei Buloh , 28 Mar.2005 (25037, coll. P. Grootaert, Si 553).

Diagnosis. – Rather large species with short surstyli; cerci longer than surstyli. Hind tibia with some short posteroventral bristles near middle (not erect like in T. simplicissimus ).

Description. – Male. Body length: 1.5 mm; wing length: 1.6 mm.

Head. Frons and face shining metallic green. Face broad, about as wide as basal antennal segments. Palpi small, brown, with a small black bristle. Rostrum brownish yellow. Occiput subshining dark metallic green. Chaetotaxy as usual; minute postocellars. Postoculars short, uniseriate, black. Antenna ( Fig. 45 ) short; first and second segments brownish black; third segment dark brown, with a paler apex. Third segment short, shorter than wide, with a rounded apex. Arista about 3 times as long as antenna, shortly pubescent; basal segment slightly shorter than upper margin of third antennal segment. Thorax. Mesoscutum and scutellum subshining dark metallic green. Pleurae dark brown, with a metallic green gloss on mesopleura and metapleura; the latter with a black anterior border. Acr uniseriate; 5 dc. A minute propleural bristle.

Legs, including coxae, yellow. Mid coxa exteriorly with a vague brown longitudinal streak.

Fore leg. Coxa anteriorly with short, sparse, black hairs; towards tip a row of 4-5 short black bristles. Femur with a preapical pv, without ventral bristles. Tibia about as long as femur, with an anterodorsal serration, most in apical two thirds. First tarsal segment with a small spinule at base. Length of femur, tibia and tarsal segments (in mm): 0.46: 0.39: 0.22: 0.07: 0.06: 0.07.

Mid leg. Coxa anteriorly with short black hairs, no exterior bristle. Femur with a rather long preapical av (preapical pv probably broken); ventrally at base with some short bristles about half as long as femur is deep; tibia about as long as femur, with a strong anterior at middle; 2 ad, 1 pd; ventrally on apical half a row of 4-5 black spinules; apical bristles short. Length of femur, tibia and tarsal segments (in mm): 0.59: 0.59: 0.29: 0.17: 0.98: 0.98: 0.07.

Hind leg. Coxa with a weak black exterior bristle. Femur without ventral bristles (preapical probably rubbed off). Tibia about as long as femur; 5 dorsal bristles and some short, but distinct posteroventral bristles near middle (not erect like in simplicissimus ). Length of femur, tibia and tarsal segments (in mm): 0.57: 0.59: 0.14: 0.21: 0.14:?:?.

Wing hyaline. Costa not thickened between tips of r1 and r2+3. r4+5 and m1+2 apically more or less parallel. Length ratio of basal and apical parts of m1+2 about 1:2.5. Halter yellow. Squama brown, broadly blackened at apex, with 6 black cilia.

Abdomen dorsally dark bronze-brown, subshining. Sternites brownish. Hairs and marginal bristles on terga short, black. Hypopygium ( Figs. 46-47 ) dark brown. with short truncate ventral surstylus. Cercus a little longer than surstyli.

Female unknown.

Etymology. – The species is named after the type locality Sungei Buloh, a mangrove nature reserve on the North coast of Singapore.

Discussion. – The short, truncate ventral surstylus is quite unique in Teuchophorus . Teuchophorus bulohensis resembles T. limosus but is bigger. It differs from T. simplicissimus in having the eyes wider separated on face and lacking the erect bristles on the posterior side of the hind tibia.

Distribution and habitat. – Singapore. Actually it is only known from the holotype male found in mangrove.

Figures

Figs. 45-47. Teuchophorus bulohensis, new species, male: 45, antenna; 46, hypopygium ventral view; 47, hypopygium lateral view.