Nanodromia spinulosa

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: 120-122

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Nanodromia spinulosa

sp. nov.

Nanodromia spinulosa  sp. nov.

Figs 172-173View Figs 172-177, 184View Figs 181-185, 193-195View Figs 193-195


Acrostichal and dorsocentral bristles undifferentiated. Hind femur and tibia somewhat brownish on middle. Male: hind tibia slightly curved, anteriorly on apical half without squamiform setae, but with a row of spinule-like setae. Abdomen with vessel-like glandular structure opening between tergites 4 and 5.


Male LENGTH. Body 1.4 mm, wing 0.98 mm.

HEAD. Black, with brown to black setation. Ocellar tubercle with 2 proclinate anterior and 2 lateroclinate posterior bristles, both pairs about as long as postpedicel. Two inclinate verticals slightly longer than ocellars. Antenna with scape and pedicel yellow, postpedicel also yellowish, but paler on basal half; pedicel with moderately long ventral seta shorter than pedicel is wide; stylus brown, about 3.5 times as long as postpedicel. Palpus brown, with pale yellow subapical seta.

THORAX. Black, subshining, with yellowish setation. Postpronotal bristle hardly prominent. Mesonotum with 1 notopleural, 1 supra-alar, 1 postalar and 4 scutellars (inner pair long); acrostichals and dorsocentrals undifferentiated, scutum uniformly covered with numerous short setae arranged in more or less regular rows.

LEGS. With faint brownish ring on hind femur and hind tibia, otherwise yellow. Fore femur thickened. Mid femur ( Fig. 184View Figs 181-185) more slender than fore femur, but swollen in basal third bearing dense pubescence, 1 yellow ventral bristle near extreme base (shorter than femur is wide) and 1 yellow anterior subapical bristle as long as femur is wide. Mid tibia with unmodified setation. Hind femur only slightly wider than mid femur. Hind tibia slightly twisted and thickened on apical two-thirds; anteriorly on apical half with row of spinule-like setae.

WING. With brown pattern. Calypter brown, with pale setation. Halter white.

ABDOMEN. With tergite 1 pale, tergite 2 narrowly brown along posterior margin; remainding tergites brown; sternites 1-2 pale, remainding sternites pale brown. Tergites with scattered pale setulae dorsally

and short lateral bristles becoming more numerous towards tergite 8. Intersegmental gland-like structures represented by 1 vessel-like internal structure opening between tergites 4 and 5.

TERMINALIA. Brown. Cerci ( Fig. 194View Figs 193-195) fused, with 2 subequally long apical spines and several unmodified setae of different lengths. Epandrium completely divided. Left epandrial lamella very narrow, separated from hypandrium. Left surstylus ( Fig. 195View Figs 193-195) undivided, elongate, tapered, bearing row of setae in basal part and at apex. Right epandrial lamella large, with several unmodified setae of different lengths. Right surstylus ( Fig. 193View Figs 193-195) divided into 3 lobes, with unmodified setae. Hypandrium with 1 short seta apically. Phallus short. Two rod-shaped apodemes present.


Body Length: 1.05-1.12 mm, wing length: 1.05-1.10 mm. Hind tibia without modified bristles anteroventrally near middle. Tergite 1 white, tergite 2 only posteriorly brown, remaining tergites completely brown. Sternites 1 and 2 white, remaining sternites weakly brownish, pale brown. Ovipositor and cerci brown. No glands present.

Material examined

Holotype ♂

SINGAPORE: Seletar, 2 November 2005, swamp forest, sweeping (reg. 25410, leg. P.G.; in ZRC).


SINGAPORE: 1 ♀, Nee Soon, 20 May 2005, swamp forest, Mal 1 (reg. 25144, leg. P.G.); 1 ♀, Sime forest, 8 February 2006, forest, Mal 2 (reg. 26027, leg. P.G.); 2 ♂♂, 6 ♀♀, Sungei Buloh, 26 August 2005, mangrove, Mal 2 (reg. 25320, leg. P.G.).


The epithet ' spinulosa  ' refers to the spine-like setae on the hind tibia.



Habitat and seasonal occurrence

This species ocurrs in swamp forests and mangroves. The species apparently is present throughout the year.


Nanodromia spinulosa  sp. nov. is closely related to N. taksin Grootaert & Shamshev  but the latter has the hind tibia modified with rows of squamiform setae. In N. spinulosa  sp. nov. the hind tibia is not so strongly curved and swollen and there is only an anterior row of spinule-like setae on the apical half instead of squamiform setae. Additionally, the new species resembles N. narmjeud Grootaert & Shamshev  that has also the basal third of mid femur swollen and pubescent. However, in N. narmjeud  the mid tibia is curved, while it is straight in N. spinulosa  sp. nov.