Thinophilus somnathensis 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 : 8-11

Thinophilus somnathensis Grichanov , sp. n.

https://zoobank.org/NomenclaturalActs/ 527C25DF-D510-437F-8F0B-804B68D53ABE

Fig. 2

TYPE MATERIAL. Holotype – ♂, India: Gujarat [state], Somnath , 20.86º N, 70.41º E, 7.IX 2012, seaside, K. Tomkovich leg. ( ZMUM) . Paratypes – 2♂, same data as for holotype ( ZMUM) .

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

DESCRIPTION. MALE ( Fig. 2A ). Head ( Fig. 2B ): postcranium greenish black, grey pollinose; frons bluish black, grey pollinose; face and clypeus black-violet, grey pollinose; face under antennae 1.3 times as wide as height of postpedicel; clypeus half as long as epistoma, about as wide as long; palpus yellow, bearing sparse black bristly hairs; proboscis black; 2 diverging ocellars; 1 vertical, 1 short postvertical, as long as uppermost postocular; upper postoculars uniseriate, black; middle and lower postoculars multiseriate, white, long; antenna mostly orange-yellow, darker dorsally; scape with scale-like inner projection; pedicel simple, convex on inner side; postpedicel ( Fig. 2C ) rounded, with short pubescence, slightly higher than long (15/12); arista-like stylus dorsal, black, thick basally, shortly pubescent; length ratio of scape to pedicel to postpedicel to stylus, 0.08/0.09/0.12/0.39.

Thorax: metallic bluish black, mesonotum brownish grey pollinose; pleura whitish 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; 2–3 upper and 2–3 lower, white propleural bristles of different length.

Legs: fore coxa yellow; mid coxa black and hind coxa blackish brown, both yellow at apex; legs mostly yellow with tarsomeres 4–5 brownish black. Fore leg. Coxa with short sparse black setae, longer at apex; femur slightly swollen in basal half, with two ventral rows of few fine blackish hair-like setae in basal third, at most as long as femur height; tibia bearing 2 anterodorsal, 2 posterodorsals, elongate ventral and apical setulae, white microtrichia posteroventrally in distal half; tarsus simple, with white microtrichia ventrally and elongate setulae; tarsomere 5 slightly widened, with elongate apicodorsal setulae; length of femur, tibia and tarsal segments (in mm): 0.91/0.84/0.29/0.15/0.12/0.09/0.11. Mid leg. Coxa with short black setae and 1 black bristle; femur with posteroventral row of black setae in distal third, about as long as femur height; tibia bearing 2 anterodorsal, 2 posterodorsal, 4 apicals; tarsomeres 1–4 with short apicoventral setae; segment 5 inconspicuously thickened; length of femur, tibia and tarsal segments (in mm): 1.06/1.11/0.46/0.18/0.13/0.12/0.13. Hind leg. Coxa with 1 black exterior bristle; femur ( Fig. 2D ) slightly swollen, with 2 anterodorsal bristles and 2 ventral rows of hair-like black setae, about half as long as femur height; tibia bearing 2 anterodorsal, 2 posterodorsal bristles, 4 apicals; tarsomeres 1–4 with short apicoventral setae; segment 5 inconspicuously thickened; length of femur, tibia and tarsal segments (in mm): 0.99/1.05/0.25/0.22/0.16/0.1/0.13.

Wing ( Fig. 2E ): 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), 0.31/0.16; crossvein dm-m straight; ratio of dm-m to distal part of M4, 0.19/0.41; anal vein distinct; halter yellow; lower calypter yellow, with brownish cilia.

Abdomen: bluish or greenish black, entirely grey dusted; setae and hind-marginal bristles on tergites black, short; sternites with short setae; sternite 5 with deep posterior emargination and 2 groups of elongate setae, including 4–5 setae, as long as sternite 6. Hypopygium ( Fig. 2F ) black, with brown cercus covered with black setae; epandrial lobe reduced; hypandrium fused with epandrium, short and broad, apically concave; phallosoma short and broad; phallus long, simple, narrow; surstylus straight and narrow, pointed (lateral view), with 2 long ventral bristles and few short setae at apex; cerci ( Fig. 2G ) dorsally separated, narrow, with long marginal bristles.

MEASUREMENTS. Body length 2.7 mm; antenna length 0.7 mm; wing length 2.6 mm; wing width 0.8 mm.

FEMALE. Unknown.

DIAGNOSIS. Thinophilus somnathensis sp. n. keys to T. phollae Hollis, 1964 , T. dongae Grootaert, Tang et Yang, 2015 , T. minutus Samoh, Satasook et Grootaert, 2017 , or T. minor Grootaert, 2018 ( Yang et al., 2011; Grootaert et al., 2015; Grootaert, 2017, 2018; Samoh et al., 2017). It differs from these species in the morphology of hypopygium and following combination of characters: postvertical bristle short, as long as uppermost postocular; four strong dorsocentrals with posterior bristle stronger; fore coxa with short sparse black setae; fore femur slightly swollen in basal half, with two ventral rows of few fine blackish hair-like setae in basal third, at most as long as femur height; tibia bearing elongate ventral and apical setulae, white microtrichia posteroventrally in distal half; tarsus simple, with white microtrichia ventrally; mid femur with posteroventral row of black setae in distal third, about as long as femur height; femur slightly swollen, with two anterodorsal bristles and two ventral rows of hair-like black setae, about half as long as femur height; abdominal sternite 5 with deep posterior emargination and two groups of elongate setae, including 4–5 long setae, as long as sternite 6.

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

Figures

Fig. 2. Thinophilus somnathensis sp. n. (holotype): A – habitus; B – head; C – antenna; D – hind femur; E – wing; F – hypopygium, lateral view, after maceration; G – cerci, dorsal view.