Hydrotaea barkalovi, Sorokina, Vera S. & Pont, Adrian C., 2011

Sorokina, Vera S. & Pont, Adrian C., 2011, Fanniidae and Muscidae (Insecta, Diptera) associated with burrows of the Altai Mountains Marmot (Marmota baibacina baibacina Kastschenko, 1899) in Siberia, with the description of new species, Zootaxa 3118, pp. 31-44 : 37-40

Hydrotaea barkalovi sp. nov.

Figs 3 A–D , 4 A–C

Diagnosis. This species is most closely similar to the Nearctic Hydrotaea lasiophthalma Malloch, 1919 , described from California (Lake Tahoe) and also known from Alberta and Colorado ( Huckett 1975). The holotype in the California Academy of Sciences, San Francisco, was studied by ACP in June 1979. Both species are black and elongate, with densely long-haired eyes and two ventral spinose setae at the base of hind femur. The new species differs as follows: frontal vitta narrow but visible throughout (obliterated at middle in H. lasiophthalma ), wingbase and margin of lower calypter deep yellow (creamy in H. lasiophthalma ), and fore femur with the basal patch of v+pv setae also including longer stouter setae along the pv edge (with only fine setae on the pv edge in H. lasiophthalma ).

It is also similar to H. ludingensis Ma, Li & Fan in Fan, 2008, from China (Sichuan), and to H. nepalensis Pont, 1975 , from Nepal, both of which have densely long-haired eyes and two ventral spinose setae at the base of hind femur. According to the brief information on H. ludingensis in English ( Fan 2008: 997), that species has only 5 av and 12 ad on hind femur (7–8 av and around 20 ad in H. barkalovi ). H. nepalensis has the fronto-orbital plate and parafacial entirely pruinose in both sexes, without shine.

Etymology. The species name is a patronym in honour of the eminent dipterist Anatoliy V. Barkalov (Novosibirsk), the teacher of V. S. Sorokina.

Type material examined. Holotype male, RUSSIA, Respublika Altai, Kosh-Agach area, Zerluykol’-Nur lake, 49º34'N 88º13'Е, 2300–2400 m, 23.vi.2005, A. Barkalov ( SZNM). Paratypes 1 male, same data as holotype ( SZNM); 3 males and 2 females, Respublika Altai, Ukok plateau, environs of Muzdy-Bulak lake, 2400–2900 m, 49º17'N 87º39'Е, 1,2. vii.2005, V. Sorokina, A. Barkalov , 11,12. vii.2008, V. Zinchenko, A. Barkalov; 2 males, Respublika Tyva, east bank of Hindiktig-Hol’, 50º30'N 89º54'E, 2334 m, 28.vii.2007, A. Barkalov ( SZNM); 17 males and 6 females, Respublika Altai, Chihacheva range, verkhov’ya r. Naryn-Gol [upper River Naryn-Gol], 49º49'N 89º32'Е, 2520–2600 m, na surchinakh [from Marmot burrows], 15–19.vii.2009, V. Sorokina, A. Barkalov, T. Novgorodova (2 males and 1 female each in ZMUM, BMNH & OUMNH, rest in SZNM); 1 female, Respublika Altai, Kosh-Agachskiy rayon, dolina r. Tara [River Tara valley], 2300 m, 49º39'N 88º13'E, na surchinakh [from Marmot burrows], 11.vii.2009, V. Sorokina, T. Novgorodova ( SZNM).

Description. Male: body 7.5–9.0 mm, wing 6.5–8.0 mm ( Fig. 3A ).

Head: Ground-colour black. Mouth-edge not projecting beyond level of profrons. Eye with long dense brown hairs. Fronto-orbital plate shining black, narrow, at narrowest point equal to diameter of anterior ocellus. Frontal vitta black, distinct throughout, at narrowest point slightly narrower than diameter of anterior ocellus. Frons with 7 pairs of strong frontal setae and as many weak setae between them, not reaching to ocellar triangle. Parafacial silvery-grey pruinose, upper part at level of base of antenna glossy black and contiguous with the shining frontoorbital plate; parafacial broad, 1.5 times as wide as width of postpedicel throughout. Gena broad, with a distinct dilation covered with dense setae (like Drymeia ). Antenna black, postpedicel a little longer than wide. Arista black, short pubescent, with the longest individual hairs much shorter than basal diameter of arista. Mentum of proboscis dusted. Palpus black.

Thorax: Black, mostly shining, with weak brownish-grey dust forming a median acr and a pair of dc vittae, these three fused after 2nd post dc to form a median patch; a pair of vittae through post ia, and a band along suture between dc and ia rows; postpronotal lobe whitish-grey dusted. Pleura dusted, katepisternum with a broad glossy patch in front of and below anterior seta. Scutellum shining black. 0 acr, 2+4 dc, 2 post ia, pra absent. Notopleuron without setulae. Katepisternal setae 1+1. Meron and katepimeron bare.

Wing: Clear, base conspicuously yellow. Calypters yellow; margin of lower one deeper yellow. Haltere black.

Legs: Black. Fore femur with a pair of unequal protuberances in apical part of ventral surface, with a row of long pd, and a tuft-like group of short setae and spinose setae on basal third of pv surface ( Fig. 3B ). Fore tibia emarginate on ventral surface on basal 1/3; without strong p setae, only with numerous hair-like setulae on pv surface. Mid femur with a few strong ad on basal third, with a row of long hair-like av and pv on basal 2/3 and with short strong subequal pv on apical third. Mid tibia with 1 ad at apical third and 3–5 p setae. Hind femur with 2 short, straight, adpressed ventral setae in basal quarter, separated from base of femur by twice their own length, with a complete row of long ad, with 5–8 long av in apical 2/3, without pv ( Fig. 3C ). Hind tibia with a row of short fine ad setae, a few of which are stronger and longer, 3–4 long pd, with numerous fine setae on a and av surfaces, with long hair-like setae on distal half of p and pv surfaces.

Abdomen: Black, densely grey dusted, with a black median stripe on each visible tergite. Terminalia as in Figs 4 A–C .

Female: body 7.5–8.5 mm, wing 7.0–8.0 mm ( Fig. 3D ).

Similar to male, and differing from it as follows:

Head: Frons broad, at middle one-third of head-width at this point. Fronto-orbital plate brownish pruinose, partly subshining from some angles, the glossy black patch at lunula large and extending a little way up frontoorbital plate. Ocellar triangle shining black. 7–8 pairs of frontal setae; 3 pairs of orbitals, lower pair directed outwards, middle and upper pair directed backwards and slightly outwards. Parafacial as broad as postpedicel or a little wider.

Thorax: Pra completely absent, as in male.

Legs: Fore legs without modifications. Fore femur with complete rows of pd and pv setae. Fore tibia without p seta. Mid femur in basal half with a few ad, some short av, and a row of fine pv. Mid tibia with 1 ad and 3–4 p setae. Hind femur without the pv spines near base, with 4–6 av. Hind tibia with 1 long and 2–3 short pd, 3–4 ad, and 2 short av.

Abdomen: Dull grey dusted, partly shining from some angles, median vitta indistinct to absent.

Distribution: Russia, Altai Mts.

Figures

FIGURE 3. A – D. Hydrotaea barkalovi sp. nov. A. Male (holotype), lateral view. B. Male fore legs, anterior view. C. Male hind leg, anterior view. D. Female, lateral view. E, F. Xestomyia atrox sp. nov. E. Male (holotype), lateral view. F. Male mid leg, anterior view.

FIGURE 4. A – C. Hydrotaea barkalovi sp. nov., male. A. Terminalia, lateral view. B. Terminalia, posterior view. C. Sternite 5, ventral view.