Hybos mediasiaticus, Shamshev, Igor, Grootaert, Patrick & Kustov, Semen, 2015

Shamshev, Igor, Grootaert, Patrick & Kustov, Semen, 2015, New data on the genus Hybos Meigen (Diptera: Hybotidae) from the Palaearctic Region, Zootaxa 3936 (4), pp. 451-484 : 471-473

Hybos mediasiaticus sp. nov.

( Figs 38, 39 , 32 , 55 , 56)

Type material. HOLOTYPE, ♂ labelled [printed in Cyrillic] [ KYRGYZSTAN] “ур. [ur. =urochische] Машалаган [Mashalagan, 39°57'N 71°43'E], Алайский [Alayskiy] хр. [khr. =ridge], 15 км З Шахимардана [15 km W Shakhimardan], Фрунз. [Frunz. =Frunzenskiy, now Kadamzhayskiy] р-н. [r-n. =District], Ошской [Osh] обл. [obl. =Province], 18.vii.1986, Танасийчук [Tanasiychuk]” ( ZIN). PARATYPES: TAJIKISTAN: 1 ♂, Kondara, 1100 m, valley of Varzob, 7.ix.1945, Gussakovskiy ( ZIN); 1 ♀, Gafil’abad, upper river Luchob, 2500 m, 13.viii.1940, Gussakovskiy ( ZIN); 1 ♀, Shakhdora, waterfall 8 km SW of Khorog, 2700 m, 11.vii.1965, Nartshuk ( ZIN).

Recognition. Postpedicel without dorsal setae; mesonotum with 4 shining vittae, bearing pale to yellow setae; legs with fore and mid femora largely brownish, hind femur entirely black, fore and mid tibiae brownish yellow, hind tibia brown, fore and mid tarsomeres 1–2 yellow, tarsomeres 3–5 brownish, hind tarsus yellowish. Male: hypandrium long, subrectangular, with short digitiform apical projection on left margin, bearing row of several strong, long subapical setae.

Description. Male. Wing length 4.0 mm. Head black. Occiput densely greyish pollinose, with yellow to pale setae. Ocellar tubercle with 2 moderately long, fine brownish-yellow anterior ocellars. Antenna black; postpedicel lacking setae. Proboscis dark brown. Palpus black, as long as labrum; with scattered short black setae.

Thorax black; largely light greyish tomentose, scutum with 4 shining vittae (one narrow vitta between acrostichals and dorsocentrals and one broad vitta on supra-alar face); with pale to yellowish setation. Postpronotal lobe with several short fine setae (one somewhat longer). Mesonotum with 2 notopleurals (posterior seta longer), 1 postalar and 4 inclinate scutellars (apical pair longer); additionally, short hair-like setae present on supra-alar space and scutellum; dorsocentrals mostly uniserial, fine and short, 1 pair of long prescutellars; acrostichals arranged in 2 irregular rows, longer posteriorly.

Legs with hind coxa, hind trochanter and hind femur black, fore and mid coxae and hind tibia brown (somewhat paler on extreme apex and base), fore and mid trochanters yellowish-brown, fore and mid femora largely brownish to brownish-yellow becoming yellow towards apex; fore and mid tibiae brownish-yellow to yellow; fore and mid tarsomeres 3–5 and hind tarsomere 5 brownish, otherwise tarsi yellow. Coxae and trochanters finely greyish pollinose, with pale setae of different lengths; hind coxa considerably larger than mid coxa. Fore and mid femora slender, with rows of long, pale hair-like anteroventral and posteroventral setae; no strong anterodorsal bristles on mid femur. Fore tibia with 1–3 hardly prominent, brownish dorsal setae; clothed in long pale hair-like setae posteriorly and ventrally; setae of subapical circlet long hair-like. Fore basitarsus clothed in long pale hairlike setae, tarsomere 2 with similar but shorter setation. Mid tibia with 2 moderately long brownish anterodorsal bristles on basal half, clothed in pale hair-like setae, no strong anteroventral bristles; subapical circlet including 2 long yellow bristles ventrally. Mid basitarsus with brownish-yellow spinule-like setae ventrally and long pale hairlike setae. Hind femur strongly thickened, convex, clothed in numerous long, pale hair-like setae; with two complete rows of ventral spines and complete row of somewhat longer anteroventral spines, bearing 3 moderately long, strong black anterodorsal bristles on apical part. Hind tibia thickened, clothed in long pale hair-like setae, somewhat serrate closer to apex ventrally. Hind basitarsus with several black spines ventrally, clothed in long hairlike setae.

Wing hyaline, uniformly covered with microtrichia (except extreme base); veins yellowish brown; no costal bristle; stigma very indistinct, elongate-ovate; R1 close to costa subapically; R4+5 and M1+2 somewhat divergent near wing margin. Squama yellow, with pale setae. Halter pale yellow.

Abdomen black, finely greyish pollinose, subshining in dorsal view, covered with pale fine setae longer on tergites laterally and sternites. Terminalia ( Figs 38, 39 ) black, somewhat broader than abdomen. Cerci short, with some short fine setae. Right epandrial lamella subtriangular in dorsal view, with numerous moderately long setae; right surstylus rather digitiform (dorsal view), with some short setae. Left epandrial lamella with several very long setae on apical part ( Fig. 38 ); left surstylus short, subtriangular, with several short setae. Hypandrium ( Fig. 39 ) elongate, subrectangular, with short digitiform apical projection on left margin, bearing row of several strong, long subapical setae.

Female. Similar to male but hair-like setae on legs somewhat shorter; hind femur more slender and uniformly thickened, no black anterodorsal bristles; tergite 7 unmodified; sternite 7 considerably broader than sternite 6; segment 8 short, partly exposed, somewhat upturned; tergites 8 with anterior margin entirely encircling abdomen, stronger sclerotised, with long posteromarginal setae (except ventrum bare), including 1 longer and stronger on each side dorsally, slightly concave posteriorly ( Figs 55, 56 ); sternite 8 separated from tergite 8, ovoid, covered with numerous setae of different lengths; segment 10 broad; tergite 10 membranous; sternite 10 weakly sclerotised, with minute spinule-like setae; cerci brownish, short, subglobular, broadly separated.

Etymology. The name of the new species refers to the area of its origin, Middle Asia.

Distribution. PALAEARCTIC: Kyrgyzstan and Tajikistan ( Fig. 32 ). This is the first record of Hybos from Middle Asia.

Remarks. The new species is closely related to H. andradei sp. nov. The main differences between these species have been noted in the key.

Figures

FIGURE 32. Distribution map of Hybos femoratus and H. mediasiaticus sp. nov.

FIGURES 38 – 39. Hybos mediasiaticus sp. nov., male terminalia. 38. epandrium and cerci, dorsal view; 39. hypandrium, ventral view. Scale bar— 0.1 mm.

FIGURES 55 – 59. Hybos, female terminalia. 55, 56. H. mediasiaticus sp. nov.: 55. ventral view, 56. lateral view; 57. H. striatellus, ventral view; 58, 59. H. vagans: 58. ventral view, 59. lateral view. Abbreviations: c—cercus, fr—furca, T 8, T 10 — tergites 8 and 10, S 8, S 10 — sternites 8 and 10, respectively. Scale bar: 0.1 mm.