Tenuopus soderlundi Grichanov, 2018

Grichanov, I. Ya., 2018, A new subfamily of Dolichopodidae (Diptera) for Tenuopus Curran, 1924 with description of new species from Tropical Africa, Far Eastern Entomologist 365, pp. 1-25 : 19-21

Tenuopus soderlundi Grichanov , sp. n.

Figs 26–28

TYPE MATERIAL. Holotype – ♂, South Africa: Cape Province, 10 km S of

Citrusdal, Koomlandskloof, 32°40'S, 19°01'E, Malaise-trap, at stream in low indigenous forest, 5–8.X 1994, M. Söderlund [ ZMLU]. Paratype: 1♂, Republic of

South Africa: Cape Province, 10 km S of Citrusdal, Koomlandskloof , 32°40'S ,

19°01'E, Malaise-trap, fynbos on mountain, 5–7.X 1994, Michael Söderlund

[ ZMLU].

DESCRIPTION. Male (somewhat discolorated). Head: frons black, shining; one pair of short postvertical setae; upper postocular setae black, slightly increasing in length upward; lateral and lower postoculars white; ventral postcranium covered with irregular white hairs; face silvery-white, 6 times as high as wide in middle,

nearly as wide as postpedicel; clypeus bulging; antennae as long as height of head,

with yellow scape and pedicel and orange postpedicel; pedicel projected distally on inner side, with a crown of short black setae, 1-2 dorsal setae longer; postpedicel rounded, as long as high (1/1); arista-like stylus dorsal, with short hairs; length ratio of scape to pedicel to postpedicel to stylus (1 st and 2 nd segments), 5/6/8/6/39; palpus and proboscis short, yellow, covered with white hairs, proboscis also with a pair of black lateral setae.

Thorax: pleura yellow; mesonotum orange, with median black stripe half as wide as surface between dorsocentral bristles, wider posteriorly; scutellum black dorsally; 6 dorsocentral setae with posterior pair shifted laterally; acrostichals absent; scutellum with 2 strong bristles and 2 short lateral hairs; proepisternum with

2 long yellow setae.

Legs including coxae yellow; tarsi brown from tip of basitarsus; fore and mid coxae with black hairs anteriorly and 4-7 black apical bristles of various length;

hind coxa with one long black outer bristle above middle; fore leg without remarkable

26 – head; 27 – wing; 24, 28 – hypopygium after maceration, right lateral view; 25 – epandrial lobes and surstylus, right lateral view.

hairs and setae; fore tibia simple, with 1 short anterodorsal at base, 1-2 short apical setae; claws simple; mid femur with strong anterior preapical seta; mid tibia with 2-

3 anterior, 3 posterodorsal, 3-5 ventral, 4-5 apical setae; mid basitarsus with several short ventral setae; hind femur without long hairs, with 1 strong anterior preapical seta; hind tibia with 4-5 anterior, 2 anterodorsal, 2 posterodorsal, 3-4 apical setae.

Femur, tibia and tarsomere (from first to fifth) length ratio: fore leg: 13/13/11/5/

3/2/2, mid leg: 16/21/14/6/4/2/2, hind leg: 19/27/8/9/5/3/2.

Wing hyaline, veins yellow; subcosta very thin; ratio of part of costa between

R 2+3 and R 4+5 to that between R 4+5 and M 1, 4/1; M 1 with gentle arc to apex, reaching costa far before wing apex; M 2 present as fold on membrane; crossvein dm-m

straight; ratio of crossvein dm-m to apical part of M 1+2 (fork-handle) to apical part of M 4, 2.5/6/11; anal vein foldlike, not reaching wing margin; anal angle obtuse;

lower calypter yellow, with brown apex and pale setae; halter yellow, halter stem thin and long, with dorsal and ventral groups of short hairs distally.

Abdomen mostly yellow, black setose; 1 st segment yellow, with white hairs ventrally; 5 th segment mostly brown, 6 th segment black; epandrium yellow-brown;

surstylus and epandrial lobes brown; hypandrium relatively long, simple; phallus thin and simple; basoventral epandrial lobe reduced to 3 long apical setae at base of hypandrium; 1 long epandrial lobe distally with short setae at apex; 2-3 short setae between basoventral and distoventral lobes; surstylus short, about 1/3 as long as epandrium, strongly sclerotised, paw-shaped, with 4 apical processes; cercus yellow, half as long as epandrium, rounded, with short apical projection, covered with short hairs and several setae.

MEASUREMENTS (in mm). Body length 5-5.2; antenna length 1.1; wing length 4.2; wing width 1.4.

Female. Unknown.

ETYMOLOGY. The species is named after the Swedish entomologist, Dr. M.

Söderlund ( ZMLU), the collector of the type specimens .

DISTRIBUTION. South Africa.

DIAGNOSIS. T. soderlundi sp. n. is the smallest fly in the genus and belongs to a group of species with uniseriate acrostichals or without acrostichals, being the closest to T. cognatus , differing from the latter in wing vein M 4 more than 4 times longer than dm-m; abdomen with 2 nd –4 th segments entirely yellow (see key above).

Figures

Figs 23–28. Tenuopus spp. 23–25 – T. cognatus Parent; 26–28 – T. soderlundi sp. n.; 23,