Teuchophorus tiomanensis, Grootaert, 2006

Grootaert, Patrick, 2006, The Genus Teuchophorus (Diptera: Dolichopodidae) In Singapore, Raffles Bulletin of Zoology 54 (1), pp. 59-82 : 75-77

Teuchophorus tiomanensis , new species

( Figs. 40-44 )

Material examined. – Holotype male: MALAYSIA: Pulau Tioman , Paya, 19 Jul.2005 (25237, coll. P. Grootaert, Tio 44).

Paratypes: MALAYSIA: 198 males, 118 females, Pulau Tioman , Paya, 19 Jul.2005 (25237, coll. P. Grootaert, Tio 44; 25 males selected for DNA sequencing) ; 10 males, Juara , 20 Jul.2005 (25244, coll. P. Grootaert, Tio 77) ; 30 males, Juara , 20 Jul.2005 (25245, coll. P. Grootaert, Tio 87) , 16 males, Juara , 20 Jul.2005 (25246, coll. P. Grootaert, Tio 126). Females of the Juara samples could not be separated from the females of T. simplicissimus .

Diagnosis. – Antenna brownish black with third antennal segment as long as wide. No stigma present and costa between r1 and r2+3 only faintly darkened. Acr uniseriate. Fore tibia with dorsal serration. First tarsomere of fore leg with a small basal spinule. Mid tibia ventrally with a row of spinules in apical half. Hind femur with minute bristles, except for 3 av bristles in apical third. Hind tibia with 3 dorsal bristles; posteroventrally in apical half a row of hairs about as long as tibia is wide. Hypandrium black, pointed. Cercus with long apical bristles, surpassing tip of ventral surstylus. Dorsal surstylus not developed.

Description. – Male. Body length: 1.6-1.75 mm; wing length: 1.5-1.6 mm.

Head. Frons subshining metallic green. Face wide, almost as wide as basal antennal segment. Palpi small, black, with a small black bristle. Rostrum brown. Occiput subshining dark metallic green. Chaetotaxy as usual. Postoculars short, uniseriate, black. Antenna ( Fig. 40 ) short; first and second segments brownish black; third segment dark brown, with a lighter coloured apex. Third segment as long as wide, with a rounded tip. Arista 3.5 times as long as antenna, shortly pubescent; basal segment longer 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. Acr uniseriate, much shorter than dc; 5 dc.

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

Fore leg. Coxa anteriorly with short, sparse, brownish hairs; towards tip a row of 4 brownish bristles. Femur with a very weak preapical pv. Tibia about as long as femur, with an anterodorsal serration ( Fig. 42 ). First tarsal segment with a spinule at base. Length of femur, tibia and tarsal segments (in mm): 0.49: 0.41: 0.21: 0.07: 0.07: 0.07: 0.08.

Mid leg. Coxa anteriorly with short brownish hairs, no exterior bristle. Femur with a rather long preapical av, and a slightly shorter preapical pv; ventrally with only minute hairs. Tibia about as long as femur; 2 ad, 1 pd; ventrally on apical third a row of 4-5 short spine-like bristles; apical bristles short. Length of femur, tibia and tarsal segments (in mm): 0.59: 0.59: 0.25: 0.17: 0.09: 0.08: 0.07.

Hind leg. Coxa with a weak black exterior bristle. Femur ( Fig. 41 ) without ventral bristles, with two long av preceding the preapical a. Tibia about as long as femur; 3 dorsal bristles; a weak posterior in basal 2/5; posteroventrally in apical half a row of hairs about as long as tibia is wide ( Fig. 41 ). Length of femur, tibia and tarsal segments (in mm): 0.59: 0.63: 0.13: 0.24: 0.11: 0.07: 0.07.

Wing hyaline. Costa not thickened between tips of r1 and r2+3, hardly darker than the rest of the costa. r4+5 and m1+2 apically more or less parallel. Apical half of m1+2 about twice as long as tp. Halter white. Squama brown, darker at apex, with dark cilia.

Abdomen dorsally dark bronze-brown, subshining. Sternites brown. Hairs and marginal bristles on terga short, black. Hypopygium ( Figs. 43-44 ) dark brown. Hypandrium broad at base, but tip narrow and elongate. A single short basal epandrial bristle present. Dorsal surstylus absent. Cercus yellowish, but with a brown tip bearing about 3-4 long bristles.

Female. Body length: 1.4-1.7 mm; wing length: 1.3-1.45 mm. In most respects identical to male. Fore tibia with a weak serration. First tarsal segment also with a basal spinule. Mid tibia without ventral spinules in apical half; a strong av bristle near middle (absent in male), a strong anterior at basal quarter and an anterior just below middle. Hind tibia without a pv row of hairs.

Etymology. – The name tiomanensis refers to the type locality Pulau Tioman, a Malaysian island in the South China Sea. Discussion. – T. tiomanensis is related to T. simplicissimus but can easily be distinguished from the latter by its cerci that are as long as the single surstylus, and that bear a number of long bristles at tip.

Distribution and habitat. – Malaysia, Pulau Tioman. Mangrove.

Figures

Figs. 40-44. Teuchophorus tiomanensis, new species, male: 40, antenna; 41, hind leg anteriorly with detail of tibia in posterior view; 42, fore leg; 43, hypopygium ventral view; 44, hypopygium lateral view.