Tenuopus gorongosaensis 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 : 9-11

Tenuopus gorongosaensis Grichanov , sp. n.

Figs 2 , 9 , 16, 17

TYPE MATERIAL. Holotype – ♂, [ Mozambique:] Gorongosa mountain ,

Manica-Sofala Dist., Port. East Africa, 840 m, gallery forest, IX 1957, Stuckenberg

[ NMSA]. Paratypes : 1♂, 1♀, same label [ NMSA] .

DESCRIPTION. Male. Head: frons black, grey pollinose; one pair of short postvertical setae, as long as uppermost postocular seta; upper postocular setae black,

increasing in length upward; lateral and lower postoculars white; ventral postcranium covered with irregular white hairs; face silvery-white, 7 times as high as wide in middle, nearly as wide as postpedicel; clypeus slightly bulging; antennae as long as height of head, with yellow scape and pedicel and yellow-brown postpedicel;

pedicel projected distally on inner side, with a crown of short black setae, one of dorsal setae as long as pedicel; postpedicel rounded, as long as high at base (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), 5/5/6/2/32; palpus and proboscis short, yellow,

covered with white hairs, proboscis also with a pair of black lateral setae.

Thorax: pleura dirty yellow; mesonotum brownish orange, with narrow black stripe along acrostichals, wider posteriorly and black on scutellum dorsally; 6

dorsocentral setae with posterior pair shifted laterally; acrostichals irregularly biseriate, short, nearly reaching 5 th dorsocentrals; scutellum with 2 strong bristles and 2 short lateral hairs; proepisternum with 2 yellow setae.

Legs yellow; last segments of tarsi brown; fore and mid coxae with black hairs anteriorly and 5-7 black apical bristles of various length; hind coxa with one long black outer bristle above middle; fore femur with only few light fine erect ventral hairs on basal half, and 3 short black posteroventral cilia; fore tibia simple, with 1

anterodorsal and 1 posterodorsal at base, 1-2 apical setae; 3 rd to 5 th segments with posteroventral row of short semi-erect setulae; claws simple; mid femur with strong anterior preapical seta, practically glabrous ventrally, with microscopic white ventral hairs; mid tibia with 4 anterior, 4 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 5 anterior, 5 posterodorsal, 3-4 apical setae. Femur, tibia and tarsomere (from first to fifth) length ratio: fore leg:

10/11/9/4/3/2/1, mid leg: 13/18/13/5/4/2/1, hind leg: 14/23/9/6/4/2/1.

Wing greyish, almost hyaline, veins brown; 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, 6/1; M 1 with gentle arc to apex, reaching costa right 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, 4/11/13; anal vein foldlike, not reaching wing margin; anal angle obtuse; lower calypter yellow, with black apex and pale setae; halter yellow with orange knob, halter stem thin and long, with dorsal and ventral groups of short hairs distally.

Abdomen mostly yellow-orange, black setose; 1 st segment yellow, with narrow black posterior edging; 2 nd –5 th yellow, with narrow black posterior edging and broad black triangular spot anteriorly; 6 th mostly black, yellow distally; 8 th segment and epandrium entirely yellow; 8 th segment with yellow hairs; cercus and dorsal surstylus yellow, ventral surstylus brown; cercus covered with dark-yellow hairs and setae; hypandrium small, simple; phallus thin and simple; 2 epandrial lobes distally on each side; thick epandrial lobe with 3 apical setae; thin epandrial lobe with 2 apical setae; short epandrial seta close to epandrial lobes; 1 short and 1 long epandrial setae at base of hypandrium; surstylus about as long as cercus, divided in

2 lobes from base, with both lobes curved towards longitudinal axis of hypopygium; ventral lobe of surstylus with 1 short apical spine; cercus half as long as epandrium, spatulate, slightly expanded distally, covered with long hairs dorsally and distally.

MEASUREMENTS (in mm). Body length 6.3; antenna length 1.3; wing length

5; wing width 1.5.

Female. Similar to male except lacking male secondary sexual characters. Face wider; legs simple; femur, tibia and tarsomere (from first to fifth) length ratio: fore leg: 9/10/9/5/3/2/1, mid leg: 10/16/11/5/3/1.5/1, hind leg: 13/22/8/6/4/2/1.

MEASUREMENTS (in mm). Body length 6.9; wing length 6.1; wing width 2.

ETYMOLOGY. The species is named after the type locality.

DISTRIBUTION. Mozambique.

DIAGNOSIS. T. gorongosaensis sp. n. belongs to a group of species with biseriate acrostichals, being the closest to T. kirkspriggsi sp. n., differing from the latter in male cercus half as long as epandrium, subtriangular (see key above).

Female is close to T. taitensis , differing from the latter in hind tibia and basal half of hind basitarsus yellow (see key above).

mouthparts (abbreviations: clyp – clypeus; lbl – labellum; lbr – labrum; plp – palpus; premnt –

prementum); 8–14 – hypopygium after maceration, right lateral view: 8 – T. bururiensis sp. n.;

9 – T. gorongosaensis sp. n.; 10 – T. kirkspriggsi sp. n.; 11 – T. kylei sp. n.; 12 – T. lomholdti

sp. n.; 13 – T. shcherbakovi Grichanov ; 14 – T. unicolor (Becker) .

Figures

Figs 1–6. Tenuopus spp., head: 1 – T. bururiensis sp. n.; 2 – T. gorongosaensis sp. n.; 3 – T. kirkspriggsi sp. n.; 4 – T. kylei sp. n.; 5 – T. lomholdti sp. n.; 6 – T. unicolor (Becker).

Figs 7–14. Tenuopus spp. 7 – T. shcherbakovi Grichanov, head in ethanol with everted

Figs 15–18. Tenuopus spp., epandrial lobes and surstylus, right (15, 18) and left (16) lateral