Thinophilus sambharensis 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 : 13-16

Thinophilus sambharensis Grichanov , sp. n.

https://zoobank.org/References/ B4C4440D-5D5B-4AED-81A3-922C6DE9C5BA

Fig. 4

TYPE MATERIAL. Holotype – ♂, India: Rajasthan [state], Sambhar salt lake, 26.92° N, 75.19° E, 24.II 2011, N. Vikhrev leg. ( ZMUM).

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

DESCRIPTION. MALE ( Fig. 4A ). Head ( Fig. 4B ): postcranium blackish green, white pollinose; frons densely brownish grey pollinose, with violet spot under ocellar tubercle; face and clypeus greenish blue, brownish grey pollinose; face under antennae 2 times as wide as height of postpedicel; clypeus about half as long as epistoma, 1.5 times wider than long; palpus yellow, 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; antenna mostly yellow; pedicel brown dorsally and postpedicel brownish distally; scape with scale-like inner projection; pedicel simple, convex on inner side; postpedicel ( Fig. 4C ) rounded, with short pubescence, slightly higher than long (19/15); arista-like stylus dorsal, black, thick basally, shortly pubescent; length ratio of scape to pedicel to postpedicel to stylus, 0.09/0.13/0.15/0.67.

Thorax: metallic, whitish grey dusted; mesonotum dark blue-green; pleura bluish black; no acrostichals; 6 dorsocentrals decreasing in length anteriorly; scutellum with 2 strong marginals and 2 short laterals; 7–8 upper and 7–8 lower, white propleural bristles of different length.

Legs: fore coxa black in basal half, yellow in distal half; mid and hind coxae black, yellow at apex; fore femur mostly black, yellow at knee; fore tibia blackish brown; fore tarsus mostly dirty yellow with last segment black; mid leg mostly yellow with last tarsomere black; mid tibia partly brown; hind femur black dorsally on distal 1/3; hind tibia blackish brown; hind tarsus mostly black, brown ventrally. Fore leg ( Fig. 4D ). Coxa with long black bristles; femur swollen, with 2 ventral rows of short setae, with 5–6 posteroventral setae, as long as femur height; tibia slightly squeezed laterally, bearing 3 long anterodorsal, 3 short posterodorsal, 2 long spinelike apicoventral bristles and 2 ventral rows of short setae, longer at base; basitarsus slightly curved at base; tarsomeres 1–2 with ventral row of short spines, and with posteroventral row of setae, longer than width of segments; tarsomeres 3–4 with dorsal setae, 2 times longer than width of segments; tarsomere 4 with long dorsal bristle, nearly 4 times longer than width of segment; tarsomere 5 slightly widened, with elongate apicodorsal setulae; length of femur, tibia and tarsal segments (in mm): 1.63/1.42/0.58/0.29/0.21/0.18/0.22. Mid leg. Coxa with long black setae and 1 black bristle; femur with anteroventral row of short black setae, posteroventral row of short black setae, longer in distal half, posterior row of short setae in distal half; tibia bearing 3–4 anterodorsal, 3 posterodorsal, 4 apical bristles; segment 5 slightly flattened dorso-ventrally and widened; length of femur, tibia and tarsal segments (in mm): 1.72/1.93/0.95/0.29/0.23/0.18/0.24. Hind leg. Coxa with 1 black exterior bristle; femur with anteroventral row of short black setae, posteroventral row of somewhat longer black setae, about half as long as femur height, anterodorsal row of 5 bristles in distal half; tibia bearing 5 anterodorsal, 4 posterodorsal bristles, 3 ventrals, 2 apicals; segment 5 with elongate apicodorsal setulae; segment 5 inconspicuously widened; length of femur, tibia and tarsal segments (in mm): 2.31/2.48/ 0.62/0.51/0.32/0.24/0.25.

Wing ( Fig. 4E ): hyaline, with distinct dark shades on dm-m and M1+2; 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), 0.49/0.37; crossvein dm-m straight; ratio of dm-m to distal part of M4, 0.48/0.67; anal vein distinct; halter yellow; lower calypter yellow, with white cilia.

Abdomen: green-blue, entirely white dusted; setae and hind-marginal bristles on tergites black, short; sternites with short setulae; tergite 5 with rounded ventral projections. Hypopygium ( Fig. 4F ) black with brown-black appendages; cercus brownish, black at base, with black bristles; epandrial lobe reduced; hypandrium fused with epandrium, short and broad, apically concave; phallosoma broad, rounded at apex, reaching apex of surstyli; phallus long, simple, apically coiled, hidden under phallosoma; surstylus ( Fig. 4G ) slightly curved, narrow, angular at apex (lateral view), with 2 long dorsal bristles and several short and long ventral and apical setae (Fig. 8F); cerci dorsally fused in basal half, elongate-ovate, with short bristles ( Fig. 4H ).

MEASUREMENTS. Body length 5.8 mm; antenna length 0.9 mm; wing length 5 mm; wing width 1.7 mm.

FEMALE. Unknown.

DIAGNOSIS. Thinophilus sambharensis sp. n. keys to T. flavipalpis (Zetterstedt, 1843) , T. setiventris Grootaert et Meuffels , and T. nigrilineatus Grootaert, 2018 ( Yang et al., 2011; Grootaert, 2017, 2018; Samoh et al., 2017). It differs from these species in the morphology of hypopygium and armament of fore tarsus. The new species is closest to the mainly Palaearctic T. flavipalpis , differing from the latter in lighter antenna and legs, shorter bristle on fore tarsomere 4, weaker curved fore basitarsus, different shape and setation of hypopygial surstylus (see Negrobov, 1979: Fig. 1366).

ETYMOLOGY. The species is named after the Sambhar salt lake in the Indian state of Rajasthan, near the Sambhar Lake Town, Jaipur district, where the type was collected.

Figures

Fig. 4. Thinophilus sambharensis sp. n. (holotype): A – habitus; B – head; C – antenna; D – fore leg; E – wing; F – hypopygium, lateral view, after maceration; G – surstylus, lateral view; H – cerci, dorsal view.