Drapetis yaekelaensis Grootaert et Shamshev

Grootaert, Patrick & Shamshev, Igor, 2013, The flies of the family Hybotidae (Diptera, Empidoidea) collected during the Boyekoli Ebale Congo 2010 Expedition in Democratic Republic of Congo, Zootaxa 3603 (1), pp. 1-61 : 16

Drapetis yaekelaensis Grootaert et Shamshev sp. nov.

( Figs. 16–18 )

Material examined. HOLOTYPE, 3 labelled: D.R. CONGO, Yaekela , 2–7 May 2010, Malaise trap 1 in primary rain forest (reg. 30025, leg. P. Grootaert; MS name Drap3); Holotype / Drapetis yaekelaensis / Grootaert et Shamshev sp. nov. ( RBINS).

Diagnosis. Antennae and palpi brownish, entirely yellow legs, hind femora dorsoventrally curved; tergites 4–5 with squamiform setae.

Description. Male. Length: body 1.4 mm, wing 1.0 mm. Occiput black, subshining viewed dorsally; with black setation; inner verticals long, inclinate. Ocellars of different length, anterior pair short, inclinate and cruciate; posterior pair moderately long, lateroclinate. Frons narrow, subshining. Antenna brownish; postpedicel with upper margin straight and lover margin convex; 2.3 times long as wide; stylus subapical, long, 2.8 times long as postpedicel. Proboscis yellowish brown. Palpus brownish, small, rounded, bearing scattered setulae, subapical seta short, thin.

Thorax black, shining, with black setation. Prothoracic episterna without long upturned seta just above fore coxa, with several setulae on upper part. Postpronotal seta not prominent. Anepisternum (= mesopleuron) with some setulae on upper posterior corner. Mesonotum with 2 notopleurals, 1 postsutural supra-alar, 1 postalar and 4 scutellars (apical pair long, cruciate; lateral pair short); acrostichals and dorsocentrals undifferentiated, scutum evenly covered with numerous setulae, 1 pair of prescutellars long.

Legs robust with fore and hind femora and tibiae thickened, hind femur dorsoventrally curved, hind basitarsus somewhat thickened; entirely yellow. Coxae and trochanters with unmodified setation. Fore femur with rows of minute anteroventral and posteroventral setulae. Fore tibia lacking prominent bristles (except subapicals). Mid femur with rows of minute anteroventral and posteroventral setulae, 1 long yellow seta near base and 1 black subapical seta anteriorly. Mid tibia lacking ventral spinules and prominent bristles (except subapicals). Hind femur with 2 moderately long anteroventrals subapically and some short erect dorsal setae near base. Hind tibia lacking prominent setae; apical projection small, rounded. Tarsi of all legs unmodified, with unmodified setation.

Wing normally developed, hyaline. Costal bristle long, black. Costal index: 21/9/19. Vein R2+3 strongly curved. Veins R 4+5 and M1+2 divergent near wing apex, both slightly bowed. Crossvein bm-cu transverse. Crossvein r-m beyond middle of cell bm. Halter brown.

Abdomen. Tergite 1 narrow, divided medially; tergites 2–3 and 6–7 of subequal width, with unmodified setation; tergite 4 broader, dark brown, with squamiform setae; tergite 5 very narrow, with squamiform setae; tergite 7 with short posteromarginal setae. Sternites well sclerotised, undivided but sternites 3–5 deeply roundly concave posteriorly. Gland-like structure present between tergites 4–5. Terminalia ( Figs. 16–18 ) rather large, brown. Cerci separated; right cercus very small, subglobular, with several unmodified setae of different lengths; left cercus rather subrectangular, somewhat broadened apically, long, with numerous unmodified setae of different lengths; hypoproct not prominent. Epandrium completely divided. Right surstylus represented by 2 sclerites ( Fig. 16 ), covered with unmodified setae. Left epandrial lamella fused to hypandrium, with several short setae apically. Left surstylus ( Fig. 18 ), with marginal spinules and numerous unmodified setae of different lengths. Phallus short. Two rod-shaped apodemes.

Female. Unknown.

Etymology. The name refers to the type locality Yaekela .

Distribution. D.R. Congo.

Remarks. In having vein R2+3 strongly curved, D. yaekelaensis sp. nov. can be compared only with D. hiatus Whittington, 1993 described from South Africa ( Whittington 1993). Besides the colour of palpus noted in the key, these two species can be distinguished by the colour of legs, some details of the wing venation and by clearly different male genitalia.

Figures

FIGURES 16 – 18. Drapetis yaekelaensis Grootaert et Shamshev sp. nov. 16. Right surstylus; 17. Epandrium with cerci; 18. Left surstylus.