Thinophilus subpalpatus, Grichanov, 2023

Grichanov, Igor Ya., 2023, A review of the Afrotropical Thinophilus Wahlberg, 1844 (Diptera: Dolichopodidae), with the descriptions of ten new species, European Journal of Taxonomy 878, pp. 1-52 : 43-45

publication ID 10.5852/ejt.2023.878.2153

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scientific name

Thinophilus subpalpatus

sp. nov.

Thinophilus subpalpatus sp. nov.

Fig. 15 View Fig


Thinophilus subpalpatus sp. nov. keys to T. medvedevi sp. nov., differing in mid femur with row of ventral setae on distal half, 2 × as long as femur height; tarsi gradually darkened towards tips. The male of T. medvedevi sp. nov. has mid femur with rows of ventral setae, half as long as femur height; tarsomere 5 of all tarsi deep black; tarsomeres 1–4 of fore and mid tarsi yellow.


The specific epithet reflects its morphological similarity with T. palpatus Parent, 1929 .

Material examined

Holotype SOUTH AFRICA • ♂; “[Eastern] Cape Province, Umngazi Mouth ; 31290a; [31°67′ S, 29°45′ W]; coastal dunes; 20 Oct. 1972; M.E. Irwin leg.”; NMSA. GoogleMaps

Paratypes SOUTH AFRICA • 4 ♂♂, 12 ♀♀; same collection data as for holotype; NMSA .


Male ( Fig. 15A View Fig )

MEASUREMENTS. Body length 4.5–4.7 mm; antenna length 0.8 mm; wing length 3.8 mm; wing width 1.0 mm.

HEAD ( Fig. 15B View Fig ). Postcranium, frons, face, clypeus, thorax and abdomen all monochrome, black, densely whitish grey pollinose; face under antennae 1.7 × as wide as height of postpedicel; clypeus 0.35 × as long as epistoma, 1.6 × as wide as long; palp yellow, bearing white hairs; proboscis black; 2 diverging ocellars; 1 vertical, 1 postvertical, about as strong and long as, and not in row with upper postoculars; upper postoculars uniseriate, black; middle and lower postoculars multiseriate, white, long; antenna almost entirely orange-yellow ( Fig. 15C View Fig ); scape and pedicel simple; pedicel straight on inner side; postpedicel apically darkened, rounded, with short pubescence, as high as long; arista-like stylus dorsal, dark and thick basally, white and thin distally, shortly pubescent; length ratio of scape to pedicel to postpedicel to stylus, 0.09/0.06/0.13/0.54.

THORAX. No acrostichals; 6 dorsocentrals decreasing in length anteriorly; scutellum with 2 strong marginals and 2 laterals, half as long as median bristles; about 5 upper and about 5 lower, white propleural bristles of different length.

LEGS. Fore coxa yellow; mid and hind coxae black, yellow at apex, whitish grey pollinose; legs mostly yellow; fore tarsomeres 2–4, mid and hind tarsomeres 1–4 blackish at apex; segment 5 almost entirely black.

FORE LEG. Coxa with very short white setae; femur slightly thickened, with about 5 fine white ventral setae at base, half as long as femur height, with 3 posteroventral preapical black setae; tibia bearing 2 anterodorsal, 2 posterodorsal and 2–3 apical short bristles, devoid of black setulae anteriorly on distal ⅓; tarsomeres weakly thickened, with elongated setulae; length of femur, tibia and tarsal segments (in mm): 1.12/0.95/0.42/0.2/0.16/0.12/0.15.

MID LEG. Coxa with 1–2 black setae; femur with rather short fine white ventral setae; anteroventral row of 5–7 black setae, as long as femur height, 1–2 preapical posteroventral short setae; tibia bearing 2 anterodorsal; 2 posterodorsal, 4 apical short bristles; tarsal segments 4–5 slightly thickened; length of femur, tibia and tarsal segments (in mm): 1.19/1.19/0.78/0.28/0.19/0.12/0.16.

HIND LEG. Coxa without exterior bristle; femur with 1 preapical anterior and 2 preapical posteroventral short setae, without ventrals; tibia bearing 3 anterodorsal, 3 posterodorsal, 1 ventral bristles, 3 apicals; tarsal segments 4–5 slightly thickened; length of femur, tibia and tarsal segments (in mm): 1.69/1.5/0.4 5/0.36/0.21/0.17/0.16.

WING ( Fig. 15D View Fig ). Hyaline, without darker shades; veins yellow-brown, more yellowish at base; distal part of M 1+2 straight; tip of R 4+5 parallel with M 1+2; ratio of part of costa between R 2+3 and R 4+5 to that between R 4+5 and M 1+2 (in mm), 0.31/0.19; crossvein dm-m straight; ratio of dm-m to distal part of M 4, 0.38/0.46; anal vein distinct; halter yellow; lower calypter yellow, with white cilia.

ABDOMEN. With setae and hind-marginal bristles on tergites black, short; sternites with very short setulae. Hypopygium ( Fig. 15E View Fig ) black, cercus yellow; epandrial lobe fingerlike, with strong apical bristle; hypandrium short, apically concave; phallosoma relatively narrow, pointed apically, reaching apex of ventral lobe of surstylus; phallus thin, long and simple, curved at apex of phallosoma; surstylus bilobate, with thinner and longer dorsal lobe ( Fig. 15F View Fig ); each lobe with 1 long ventral bristle and short setae at apex; cerci free, evenly broad to apex, with long marginal bristles.


Similar to male except lacking male secondary sexual characters.


KwaZulu-Natal Museum













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