Drapetis mandai, Grootaert & Shamshev, 2012

Grootaert, Patrick & Shamshev, Igor V., 2012, The fast-running flies (Diptera, Hybotidae, Tachydromiinae) of Singapore and adjacent regions, European Journal of Taxonomy 5, pp. 1-162 : 62-64

Drapetis mandai sp. nov.

Figs 101-104

Diagnosis

Small species; antennal scape and pedicel brownish yellow, postpedicel yellow; palpus and proboscis brownish yellow; hind femur largely brownish, otherwise legs yellow; halter yellow.

Description

Male LENGTH. Wing 1.4 mm.

HEAD. Black. Occiput subshining, finely pollinose. Two pairs of vertical bristles present (inner pair longer). Frons subshining, strongly broadened toward ocellar tubercle, very narrow above antennae, narrower than anterior ocellus. Two pairs of equally short ocellars, anterior pair cruciate. Antenna ( Fig. 101 ) with scape and pedicel brownish yellow, postpedicel yellow; pedicel with short lower bristle; postpedicel with lower margin somewhat convex, 2.0 times longer than wide; stylus 3.5 times longer than postpedicel and 1.8 times longer than scape, pedicel and postpedicel combined. Palpus and proboscis brownish yellow.

THORAX. Black, with black setation. Prothoracic episternum with short setulae above fore coxa. Postpronotal bristle not prominent. Mesonotum with 2 notopleurals, 1 postsutural supra-alar, 1 postalar and 4 scutellars (inner pair very long, cruciate; outer pair very short); scutum entirely covered with short, pale uniform (except for 1 pair of long prescutellars) setulae.

LEGS. Short, with hind femur brownish in apical 2/3, otherwise yellow. Mid coxa with several rather long and strong setae anteriorly; mid trochanter with 3 black spinules. Fore femur thickened. Fore tibia spindle-like. Mid femur with row of spinule-like ventral setulae and 1 long anterior subapical bristle. Hind femur evenly thickened, with several longer anteroventral subapical bristles. Hind tibia thickened, arched, with slightly prominent apical projection. Tarsi of all legs unmodified, with unmodified setation.

WING. Normally developed, hyaline, covered with uniform microtrichia. Costal vein with rather long setulae along anterior margin. Costal bristle long, brown. Costal index: 24/11/22. Vein Rs originating before middle of cell r 1 (closer to humeral crossvein), somewhat longer than crossvein bm-cu. R 1 thickened. R 2+3 evenly bowed toward costa, meeting costa beyond middle of wing. R 4+5 and M 1+2 strongly divergent, evenly bowed. A 1 absent. Crossvein bm-cu transverse. Crossvein r-m beyond middle of cell bm. Halter yellow.

ABDOMEN. Tergites 4 and 5 with hardly prominent squamiform setae. Gland-like structure present between tergites 4 and 5.

TERMINALIA. Brown ( Figs 102-104 ). Cerci separated; left cercus long, digitiform, broadened in apical part, with moderately long unmodified setae; right cercus greatly reduced, represented as small subtriangular sclerite bearing several short setulae. Epandrium completely divided. Left epandrial lamella fused to hypandrium, with several very short setae apically. Left surstylus ( Fig. 104 ) with upper lobe rather large, elongate oval, covered with numerous long unmodified setae; middle lobe long, truncate, with several spines apically; lower lobe small, with 3 long unmodified setae. Right epandrial lamella ( Fig. 103 ) subtriangular, covered with numerous unmodified setae of different lengths. Right surstylus ( Fig. 102 ) represented by one lobe, long, divided at apex, with several unmodified setae of different lengths. Hypandrium lacking setation. Phallus elongate. Two rod-shaped apodemes present.

Female Unknown.

Material examined

Holotype ♂

SINGAPORE: Mandai mangrove, 9 October 2000, mangrove, sweeping (reg. 20038, leg. P.G. & N. Evenhuis; in ZRC).

Etymology

The new species is named after its type locality.

Distribution

Singapore.

Habitat and seasonal occurrence

This species occurs in mangroves with a single record from October.

Remarks

This species is similar to D. hutan sp. nov. and the main distinguishing features are indicated in the key.

Figures

Figs 101-104. Drapetis mandai sp. nov., ♂. 101. antenna, lateral view. 102. right surstylus, dorsal view. 103. epandrium and cerci. 104. left surstylus, lateral. Scale bar= 0.1 mm.