Hybos kaluang, PLANT, 2013

PLANT, ADRIAN R., 2013, The genus Hybos Meigen (Diptera: Empidoidea: Hybotidae) in Thailand, Zootaxa 3690 (1), pp. 1-98 : 31-32

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

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scientific name

Hybos kaluang

sp. nov.

Hybos kaluang View in CoL sp. nov.

( Figs 68–73 View FIGURES 68–73 , 254 View FIGURES 251–259 , 292 View FIGURES 291–298 )

Type material. HOLOTYPE ♂: THAILAND, Chiang Mai Province, Doi Inthanon National Park , campground pond, 18°32.657'N, 98°31.482'E, 1200 m, 22.vii–2.viii.2006, Malaise trap, Y. Areeluck [ T117 ] ( QSBG). GoogleMaps PARATYPES: 3♂, 3♀, same data as holotype, 22.vii.-2.viii.2006, 2–9.viii.2006 ( QSBG and NMWC)

Additional material. 1♀, Lampang Province, Chae Son National Park, Doi Laan   GoogleMaps unit-2, 18°51.815'N, 99°22.122'E, 1423 m, 15–21.v.2008: 1♀, Petchaburi Province, Kaeng Krachan National Park, Pa La-U/ Waterfall   GoogleMaps / Ficus tree, 12°32.154'N, 99°28.098'E, 27.xi.-4.xii.2008: 3♀, Chiang Mai Province, Doi Chiangdao, Pakea Station, Evergreen forest   GoogleMaps , 19°18'50.7"N, 98°49'57.8"E, 1560 m, 31.v.-6.vi.2009, 6–12.vi.2009, 18–24.vi.2009: 1♀, Kamphaeng Phet Province, Mae Wong National Park, Chong Yen   GoogleMaps , 16°5.212'N, 99°6.576'E, 1306 m, 16–24.vi.2008 ( QSBG and NMWC) .

Etymology. The species is named from a contraction of the Thai kaa (leg) and see luang (yellow) in reference to its predominantly yellow legs.

Diagnosis. A species with antennal stylus bare. Mid tibia clear yellow, hind tibia yellow at least on basal half, front tibia yellow at base only. Distinct ventral bristles are present near the base of both the front and mid metatarsi. Mid tibia near middle with a very long bristle dorsally and another ventrally just beyond it. Hypandrium with distinctive hook-shaped subapical process.

Description. Male: body length 3.0 mm. Head subshining black dusted greyish; face yellowish black; postocular occipital setae black, some pale bristles on lower occiput. Antenna greyish black; postpedicel slightly paler, ovate in lateral view, ~2.0–2.5X long as wide, lacking dorsal seta; stylus bare, ~5X long as postpedicel, apical 0.2 narrower, whitish in some lights. Mouthparts blackish, palpus very narrow, with 2 indistinct fine bristles apically. Thorax with ground colour black, subshining; pleurae paler, dark yellowish black; yellowish about postalar callus, scutellum vaguely at base and postpronotal lobes very narrowly on outer edge; scutum subshining, thinly greyish dusted, more shining patch laterally outside line of dc; acr 2-serial, fine and hair-like; dc uniserial, similar to acr but posterior dc and acr before prescutellar area strong; 1 long, 1 shorter npl, 1 strong pa and 2 apical sct with several fine pale marginal hairs. Legs with coxae and femora black. T 1 blackish, narrowly yellow at base; T 2 clear yellow; T 3 clear yellow on proximal 0.3–0.5, becoming brownish black distally. Tarsomeres 1 and 2 of all legs yellow; distal tarsomeres blackish. Coxae with hairs and bristles whitish. F 1 with pv and av fringes of pale hairs very fine, hardly as long as limb is deep. F 2 very slightly concave about middle viewed from above; a few fine setae anteriorly near base, short pv fringe of very fine hairs, ~2–3 short dark bristles anterodorsally near tip, otherwise short-haired. F 3 moderately inflated, widest 0.6–0.8 from base were ~2X wide as at base; ventral spines comprising av row of 6–7 strong bristles as long as limb is deep behind which are 8–10 somewhat shorter bristles; pv fringe with 3–4 strong black bristles on distal 0.3, continued basally by shorter yellowish hairs; with ~5 strong black curved anterior proclinate bristles on distal 0.5. T 1 with distinct fine bristle dorsally at 0.7 from base; ventral fringe of fine pale hairs becoming rather longer than limb is deep on distal 0.3; apical circlet weakly developed except 1 dorsal setae ~0.6X long as MT 1. T 2 with long somewhat proclinate bristle 0.7 X long as limb dorsally at ~0.3 and ventrally at 0.4–0.5 from base; apical circlet of ~6–7 strong setae, including 2 ventrally and anteroventrally 0.5 and 0.7X long as MT 2. T 3 slightly swollen distally, strong bristles dorsally at 0.5 and 0.6 and anteriorly at 0.8–0.9; apical circlet with only 1 dorsal and 1 av strongly developed. Anterior and mid tarsi with pair of fine but distinct dorsal hairs apically on segments 1 and 2; MT 1 with short and MT 2 with longer (0.5X length of segment) ventral bristle at base; MT 3 with 3 short spines ventrally. Wing membrane faintly brownish, veins brown; stigma fairly distinct, reaching costa 0.5–0.6 distance between end of R 1 and R 2+3. Squamae with pale fringes. Halter white with darker stem. Abdomen brownish black, dusted, with somewhat bronze reflections, paler ventrally; long pale setae on posterior margins of tergites, becoming shorter on distal segments. Terminalia ( Figs 68–71 View FIGURES 68–73 ) black; right epandrial lamella with short pointed apical process. Left surstylus ( Fig. 70 View FIGURES 68–73 ) with two narrow lobes; right surstylus ( Fig. 71 View FIGURES 68–73 ) moderately elongate, curving inwardly, a small anteriorly directed pointed process on inner face near base. Hypandrium rather broad ( Fig. 69 View FIGURES 68–73 ), with subapical hook-shaped process and mostly fine hairs apically. Female. Differing from male as follows. T 3 less strongly inflated, widest 0.7–0.9 from base where only ~1.5X wide as at base; pv fringe fine and hair-like throughout, with only 1 black bristle apically; only 1 strong black curved slightly proclinate bristle anteriorly at 0.8–0.9. Abdomen with all setae shorter. Terminalia ( Figs 72, 73 View FIGURES 68–73 ) rather broad, truncate apically; tergite 8 black, strongly sclerotized, almost encircling abdomen, not divided dorsally; sternite 8 narrow, apically curved dorsally and partially hidden in lateral view by whitish membranous structure ( Fig. 73 View FIGURES 68–73 ). Sternite 10 and cerci small, pilose.

Comment. Hybos kaluang sp. nov. is very similar to H. thaosaeo sp. nov. and may be distinguished by the yellow markings of the tibiae being more distinctly defined and clearer yellow than the more diffuse markings present on H. thaosaeo sp. nov. Also, the scutum of H. thaosaeo sp. nov. is more uniformly dusted and lacks the lateral shining patch present in H. kaluang sp. nov. However, differences in the male and female terminalia offer better diagnostic characters. Hybos kaluang sp. nov. is known from five forest localities in the Daen Lao, Thanon Thongchai, Khun Tan and Tenasserim ranges of north and west of Thailand ( Fig. 254 View FIGURES 251–259 ), mostly from May to August ( Fig. 292 View FIGURES 291–298 ) at altitudes of 1,000 –1,560 m.


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