Tenuopus comorensis Grichanov, 2019

Grichanov, I. Ya., 2019, New Afrotropical species of Tenuopus Curran, 1924 (Diptera: Dolichopodidae), Russian Entomological Journal 28 (4), pp. 460-463 : 460-462

Tenuopus comorensis Grichanov , sp.n.

Figs 1–2 .

MATERIAL. Holotype ♂ (dried from ethanol and mounted on pin), [ Comoros:] Comoren , Grand Comore, bergauf von Bahani, 12.IV.2002, M. Kotrba ( ZSM).

DESCRIPTION. Male (somewhat discolorated). Head. Frons black, grey pollinose; one pair of short postvertical setae, shorter than 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 bulging; antennae as long as height of head, yellow; pedicel projected distally on inner side, with a crown of short black setae, one of dorsal setae nearly as long as pedicel; postpedicel rounded, as long as high at base (20/17); arista-like stylus dorsal, with short hairs; length ratio of scape to pedicel to postpedicel to stylus (1 st and 2 nd segments), 11/15/20/10/73; palpus and proboscis short, yellow, covered with white hairs, proboscis also with a pair of black lateral setae.

Thorax. Pleura dirty yellow; mesonotum orange, with narrow brown stripe along acrostichals, wider posteriorly and brown on scutellum dorsally; 6 dorsocentral setae with posterior pair shifted laterally; acrostichals regularly biseriate, strong, 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 dark fine erect ventral hairs on basal half, and 3 short black posteroventral cilia; fore tibia simple, with 1 anterodorsal and 1 posterodorsal at base, 2 apical setae; 2 nd segment of fore tarsus on distal third and 3 rd segment on basal half with posteroventral row of short semi-erect setulae; claws simple; mid femur without anterior preapical seta, with anteroventral row of black erect hairs, about half as long as diameter of femur; mid tibia with 3 anterior, 3 posterodorsal, 3–4 short ventral, 4–5 apical setae; mid basitarsus with several short ventral setae; hind femur ventrally with black erect hairs, about one-third as long as diameter of femur, with 1 strong anterior preapical seta; hind tibia with 4 anterior, 4 posterodorsal, 3–4 apical setae. Femur, tibia and tarsomere (from first to fifth) length ratio (in mm): fore leg: 1.85/1.98/1.69/1.13/0.86/0.59/0.31, mid leg: 1.86/2.79/2.07/ 0.96/0.76/0.45/0.19, hind leg: 2.45/3.81/1.26/1.25/0.80/0.49/ 0.24.

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; cross-vein dm-m straight; ratio of crossvein dm-m to apical part of M 1+2 (fork-handle) to apical part of M 4, 0.37/ 1.12/0.85; 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 brown posterior edging; 2 nd –5 th yellow, with narrow brown edging posteriorly and anteriorly; 6 th mostly brown; 8 th segment and epandrium entirely yellow; 8 th segment with brownish setae; cercus and surstylus yellow; cercus covered with yellow hairs and setae; hypandrium small, simple; phallus thin and simple; 2 long epandrial lobes distally on each side; thin epandrial lobe with 1 basal and 1 apical long setae, with 3 short setae; thick epandrial lobe expanded distally, with 5 setae at apex; surstylus slightly shorter than cercus, divided in 2 subequal lobes from middle, with 2 setae at apex of each lobe; cercus half as long as epandrium, elongate, with narrow distal process, covered with long setae dorsally and ventrally.

Measurements (in mm, in ethanol). Body length 7.0, antenna length 1.2, wing length 5.7, wing width 1.6.

Female. Unknown.

ETYMOLOGY. The species is named after the Comoro Islands.

DISTRIBUTION. Comoros.

DIAGNOSIS. T. comorensis sp.n. belongs to a group of species with biseriate acrostichals, being the closest to T. gorongosaensis Grichanov, 2018 and T. kirkspriggsi Grichanov, 2018 , differing in ciliation of fore leg and morphology of hypopygial appendages (see key below).

16. Cercus spatulate, slightly expanded distally;surstylus about as long as cercus, divided in 2 lobes from base; 3 rd to 5 th segments of fore tarsus with posteroventral row of short semi-erect setulae ............ T. gorongosaensis Grichanov

— Cercus swollen at base, narrow at apex; other features various ...................................................................... 16a

16a. Fore tibia with elongate ventral hairs and posterior setulae; fore tarsomeres covered with dense hairs ventrally and elongate setulae dorsally; surstylus about half as long as cercus, simple .......... T. kirkspriggsi Grichanov

— Fore tibia without elongate hairs and setulae; 2 nd segment of fore tarsus on distal third and 3 rd segment on basal half with posteroventral row of short semi-erect setulae; surstylus about as long as cercus, divided in 2 lobes from middle ............................................. T. comorensis sp.n.

Figures

Figs 1–4. Tenuopus spp., males: 1–2 — T. comorensis Grichanov, sp.n.; 3–4 — T. birketti Grichanov, sp.n.; 1, 3 — head; 2, 4 — hypopygium, lateral view. Рис. 1–4. Tenuopus spp., самцы: 1–2 — T. comorensis Grichanov, sp.n.; 3–4 — T. birketti Grichanov, sp.n.; 1, 3 — голова; 2, 4 — гипопигий, сбоку.