Hybos shamshevi, PLANT, 2013

PLANT, ADRIAN R., 2013, The genus Hybos Meigen (Diptera: Empidoidea: Hybotidae) in Thailand, Zootaxa 3690 (1), pp. 1-98 : 59-60

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https://doi.org/ 10.11646/zootaxa.3690.1.1

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Hybos shamshevi

sp. nov.

Hybos shamshevi View in CoL sp. nov.

( Figs 151–156 View FIGURES 151–156 , 230, 231, 237 View FIGURES 226–239 , 270 View FIGURES 269–277 )

Type material. HOLOTYPE ♂: THAILAND, Chiang Mai Province, Doi Phahompok National Park , Doi Phaluang , 20°1.06'N 99°9.581'E, 1449 m, 28.iv.–7.v.2008, Malaise trap, K. Seesom [ T6084 ] ( QSBG) GoogleMaps . PARATYPES: 1♂, 1♀, same data as holotype ; 4♂, 3♀, Doi Phahompok National Park   GoogleMaps , Kiewlom 1/ Montane Forest, 20°3.549'N 99°8.552'E, 2174 m, 21–28.iv.2008 and 21–28.iv.2008 ( QSBG and NMWC) .

Etymology. The species is named in honour of Igor Shamshev, a dedicated student of Hybotidae .

Diagnosis. A black legged species with entirely pale setae on coxae and stylus micropilose on basal 0.8. The mid tibia has 1 dorsal and 1 ventral seta very long; in males the hind femur is moderately inflated but distinctly narrower in females and hind tibia rather slender, only slightly swollen apically in both sexes. Distinguished from H. zhejiangensis , H. phahompokensis sp. nov. and H. inthanonensis sp. nov. primarily by differences of male and female terminalia.

Description. Male: body length 4.5–5.0 mm. Head subshining black, dusted greyish, more strongly so about mouth edge behind eye; face black, vaguely yellowish below; postocular occipital setae black, becoming pale below and short pale bristles on lower occiput. Antenna black; postpedicel slightly paler, ovate in lateral view, 2.0– 2.5X long as wide, apparently lacking dorsal seta; stylus 6X long as postpedicel, black, micropilose on proximal 0.8, hairs hardly longer than stylus is deep, apical 0.2 bare. Mouthparts blackish, palpus very narrow, with 1–2 distinct dark hairs apically and 2–3 smaller setae on basal 0.5. Thorax with ground colour black, weakly subshining, vaguely yellowish on postalar callus laterally and pleura about base of wing; rather heavily dusted greyish or whitish, more strongly on prescutellar area and scutum laterally where brownish viewed from above; acr biserial, fine and hair-like; dc uniserial, similar to acr but posterior dc and acr before prescutellar area strong; 2 npl, 1 pa and 2 apical sct with several fine pale marginal hairs. Legs rather slender, dull black, dusted greyish; ‘knees’ of front and mid legs narrowly and vaguely dark yellowish; T 3 more broadly dark yellowish brown basally. Coxae with hairs and bristles pale yellow. F 1 with ventral fringe of pale hairs longer on basal 0.6 but nowhere as long as limb is deep. F 2 very slightly concave about middle viewed from above; ventral fringe very short, hardly distinguished from other pubescent hairs; anterior fringe of fine bristles distinct only on basal 0.2. F 3 moderately inflated ( Fig. 230 View FIGURES 226–239 ), widest 0.5–0.6 from base (were>2X width of tip of T 3); ventral spines comprising an av row of 10–12 setae, most of which are conspicuously longer than limb is deep, and similar, mostly somewhat shorter pv series; pv fringe of short yellowish hairs becoming much stronger and black on distal 0.5; about 5 strong curved anterior proclinate bristles on apical 0.6; T 1 with ventral fringe of pale hairs rather erect, no longer than limb is deep; dorsal fringe darker, rather proclinate, sparser, 1 much stronger but still fine bristle 2–3X long as limb is deep at 0.5 from base and 1 smaller bristle preapically; 1 very strong apical ad (0.4X length of MT 1) and several much smaller apical setae. T 2 with long proclinate bristles 0.7 X long as limb dorsally at 0.3 and ventrally at 0.5 from base; about 6 apical and preapical bristles of different lengths, including an apicoventral 0.7X long as MT 2 and 1 similarly long posterior preapical. T 3 ( Fig. 237 View FIGURES 226–239 ) slightly swollen on distal 0.3 (~1.3X as wide at tip as at base), with dorsal hairs as long as limb is deep, 2 strong dorsal bristles 4–5X long as limb is deep near middle; ventral hairs shorter and more numerous, merging into yellowish pile on apical 0.2; 1 weak anterior preapical, shorter than anterior and dorsal apicals; apical circlet otherwise weak. MT 1 with strong bristle (0.2X long as segment) near base; and pair of longish fine hairs dorsally before tip of MT 1 and second tarsal segment. MT 2 with strong bristle near base and progressively smaller bristles at 0.5 and near tip. MT 3 with ventral spine-like setae stout but hardly longer than surrounding pubescence. Wing membrane faintly brownish, veins brown; stigma distinct, brown, moderately long, reaching costa 0.6–0.7 distance between end of R 1 and R 2+3. Squamae with pale fringes. Halter white. Abdomen brownish black with somewhat bronze reflections, dusted greyish; bristly hairs pale, longest and more numerous laterally and ventrally but terminalia ( Figs 151–154 View FIGURES 151–156 ) deep black with very strong, shining, black bristles on left epandrial lamella. Right epandrial lamella ( Fig. 152 View FIGURES 151–156 ) with inner margin bearing long flattened process; left epandrial lamella ( Fig. 151 View FIGURES 151–156 ) with short upturned process on inner margin; right surstylus comprising elongate narrow process with shorter, more rounded process beneath at base; left surstylus ( Fig. 154 View FIGURES 151–156 ) with 2 apical digitiform processes; hypandrium ( Fig. 153 View FIGURES 151–156 ) narrowed apically and basally with distinct bristles on left margin. Female. Similar to male but F 3 distinctly less inflated ( Fig. 231 View FIGURES 226–239 ), widest 0.8–0.9 from base; ventral spines more or less uniserial, comprising 8–9 setae about as long as limb is deep and ~3 conspicuously longer bristles 2X long as limb is wide at 0.3 and 0.5 and 0.8 from base; pv fringe of finer hairs, becoming stronger distally, entirely yellowish, not culminating in strong bristles on distal 0.3; only 2 bristles anteriorly at 0.6 and 0.9. Longer bristles of metatarsi less strongly developed. Abdomen brownish black; all setae shorter than in male, becoming longer on distal sternites. Terminalia ( Figs 155, 156 View FIGURES 151–156 ) with tergite 8 shining black, tubular, encircling abdomen, posterior margin linear or slightly convex, with strong bristles; sternite 8 rather elongate rectangular in ventral view, densely packed strong bristles on distal part; tergite 10 completely divided dorsally, with small lateral irregularly trapezoid plates; sternite 10 small, inflected more or less vertically.

Comment. Compared with H. zhejiangensis Yang & Yang, 1995 , males of H. shamshevi sp. nov. have the posterior tibia hardly swollen distally, the hind femur is slightly stouter and more strongly bristled, the thorax is more strongly dusted, anterior bristles on the hind femur are strongly proclinate, on the mid tibia the posterior preapical and apicoventral setae are of similar length and on the hind tibia the anterior preapical is as long as anterior and dorsal apical setae. Both sexes of the two species are more readily separated from each other and from closely similar H. phahompokensis sp. nov. and H. inthanonensis sp. nov. by differences of the terminalia. Hybos ruyuanensis Yang, Merz & Grootaert, 2006 from the Nanling Mountains, China apparently has legs of similar shape and chaetotaxy but entirely yellow; the form of its hypandrium is similar to H. shamshevi sp. nov. and H. zhejiangensis suggesting that all five species are closely related. Hybos shamshevi sp. nov. is only known from the Daen Lao Range at Doi Phahompok in the far north of Thailand ( Fig. 270 View FIGURES 269–277 ). It occurs between 1,449–2174m in April and May and thus adults are active in the same locality and season as are those of closely similar H. phahompokensis sp. nov. whereas those H. zhejiangensis are predominantly found in September and October.


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