Thinophilus calangutensis Grichanov, 2023

Grichanov, I. Ya., 2023, Four new species of the genus Thinophilus Wahlberg, 1844 (Diptera: Dolichopodidae) with new records and a key to species known from India and adjacent regions, Far Eastern Entomologist 472, pp. 1-17 : 6-8

Thinophilus calangutensis Grichanov , sp. n.

https://zoobank.org/NomenclaturalActs/ ECF8788A-1B5B-403F-AD35-33D259A7620A

Fig. 1

TYPE MATERIAL. Holotype – ♂, India: Goa [state], Calangute , [15.54° N, 73.76° E], 18.I 2008, N. Vikhrev leg. ( ZMUM).

NOTE. Terminalia of the holotype are dissected and stored in glycerin in microvial pinned with the specimens .

DESCRIPTION. MALE ( Fig. 1A ). Head ( Fig. 1B ): postcranium blackish blue, white pollinose; frons blue-green, whitish pollinose; face and clypeus bluish black, brownish grey pollinose; face under antennae slightly wider than height of postpedicel; clypeus about as long as epistoma, 1.5 times longer than wide; palpus ( Fig. 1C ) yellow, elongate-triangular, bearing sparse black bristly hairs; proboscis dark brown; 2 diverging ocellars; 1 vertical, 1 postvertical, much stronger and longer than, and not in row with upper postoculars; upper postoculars uniseriate, black; middle and lower postoculars multiseriate, white, long; antennal scape, pedicel and postpedicel blackish dorsally, yellow ventrally; postpedicel black distally ( Fig. 1D ); scape with scale-like inner projection; pedicel simple, convex on inner side; postpedicel triangular, with short pubescence, as long as high at base (15/14); arista-like stylus basodorsal, black, thick basally, shortly pubescent; length ratio of scape to pedicel to postpedicel to stylus, 0.11/0.08/0.15/0.49.

Thorax: metallic, dark greenish blue; mesonotum shining; pleura weakly pollinose; no acrostichals; 4 strong dorsocentrals with posterior bristle stronger and 3 bristles of equal length, and small hair-like seta anteriorly; scutellum with 2 strong marginals and 2 hair-like laterals; 4–5 upper and 4–5 lower, short white propleural bristles.

Legs: fore coxa yellow; mid and hind coxae black, yellow at apex; legs mostly yellow with tarsomeres 4–5 brownish black. Fore leg. Coxa with long white bristles; femur simple, almost glabrous ventrally, with few short hairs at base; tibia bearing 2 short dorsals, glabrous anteriorly on distal 1/4; tarsus simple with tarsomere 5 slightly widened, with elongate apicodorsal setulae; length of femur, tibia and tarsal segments (in mm): 0.92/0.84/0.36/0.15/0.12/0.09/0.1. Mid leg. Coxa with white setae and 1 black bristle; femur with 3 black ventral setae at base, at most as long as femur height; tibia bearing 2 short anterodorsal, 2 short posterodorsal, 2 strong and long posteroventral bristles in middle, 4 apicals; tarsomere 5 inconspicuously thickened; length of femur, tibia and tarsal segments (in mm): 1.01/1.08/0.56/0.19/0.14/0.11/0.11. Hind leg. Coxa with 1 black exterior bristle; femur with 2–3 brown ventral setae at base, at most as long as femur height; tibia bearing 2 anterodorsal, 2 posterodorsal short bristles, 1–2 short ventrals, 2 apicals; tarsomere 5 inconspicuously widened; length of femur, tibia and tarsal segments (in mm): 1.24/1.26/0.34/0.33/0.19/0.14/0.14.

Wing ( Fig. 1E ): almost hyaline, without dark shades; veins yellow-brown, more yellowish at base; distal part of M1+2 convex; tip of R 4+5 parallel with M1+2; ratio of part of costa between R 2+3 and R 4+5 to that between R 4+5 and M1+2 (in mm), 0.31/0.18; crossvein dm-m straight; ratio of dm-m to distal part of M4, 0.18/0.33; anal vein distinct; halter yellow; lower calypter yellow, with white cilia.

Abdomen: dark green-blue, entirely grey dusted; setae and hind-marginal bristles on tergites black, short; sternites with short setae. Hypopygium ( Fig. 1F ) black, with yellow cercus covered with white bristles; epandrial lobe reduced; hypandrium fused with epandrium, short and broad, apically concave; phallosoma broad, not reaching apex of surstyli; phallus simple, broad; surstylus straight and narrow, pointed (lateral view), thickened at extreme apex, with several short dorsal and apical setae; cerci dorsally fused except apices, leaflike, with long marginal bristles ( Fig. 1G ).

MEASUREMENTS. Body length 2.7 mm; antenna length 0.7 mm; wing length 2.5 mm; wing width 0.7 mm.

FEMALE. Unknown.

DIAGNOSIS. Thinophilus calangutensis sp. n. is peculiar in its triangular antennal postpedicel with basodorsal arista-like stylus. It keys to T. seticoxis Becker, 1922 or T. minutus Samoh et al., 2017 ( Yang et al., 2011; Samoh et al., 2017; Grootaert, 2017, 2018), differing from these species in mid tibia bearing two strong and long posteroventral bristles in middle and morphology of hypopygium.

ETYMOLOGY. The species is named after the town in the North Goa district of the Indian state of Goa , where the type was collected .

Figures

Fig. 1. Thinophilus calangutensis sp. n. (holotype): A – habitus; B – head; C – palpus; D – antenna; E – wing; F – hypopygium, lateral view, after maceration; G – cerci, dorsal view.