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Platycheirus Species (Diptera, Syrphidae) from the Altai Mountains, SE Siberia, with Description of Five New Species

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Platycheirus Species (Diptera, Syrphidae) from the Altai Mountains, SE Siberia, with Description of Five New Species © Norwegian Journal of Entomology. 14 May 2008 Platycheirus species (Diptera, Syrphidae) from the Altai Mountains, SE Siberia, with description of five new species Anatolii V. Barkalov & Tore R. Nielsen Barkalov, A.V. & Nielsen, T.R. 2008. Platycheirus species (Diptera, Syrphidae) from the Altai Mountains, SE Siberia, with description of five new species. Norw. J. Entomol. 55, 91––104.104. The paper reports 38 Platycheirus species from the Altai Mountains and describes the following new species, P. alpigenus sp. n., P. altaicus sp. n., P. atratus sp. n., P. fallax sp. n. and P. gunillae sp. n. Keywords: Platycheirus, new species, Syrphidae, Altai Mountains. Anatolii V. Barkalov, Institute of Systematic & Ecology of Animals, RAS, 11 Frunze Street, Novosibirsk- 91, 630091, Russia. E-mail: [email protected] Tore R. Nielsen, Sandvedhagen 8, NO-4318 Sandnes, Norway. E-mail: [email protected] INTRODUCTION expeditions to the Altai Mountains, resulting in essential material from the high mountains of SW The Altai Mountains are a mountain range in Altai, from 1963 and onwards. It has been collected eastern Asia where Russia, China, Mongolia by N. Violovitsh, A. Barkalov, V. Zinchenko, R. and Kazakhstan come together. The larger part Dudko, V. Sorokina and others. The collecting of of the Altai Mountains is on Russian territory, hoverfly material by A. Barkalov started in 1977 in the Republic of Altai. The nature of the Altai and has proceeded until recently. Mountains is highly variable, with several peaks exceeding 4000 meters (Mount Belukha reaches Our study is devoted to species of the genus 4,506 m a.s.l.). The region represents the most Platycheirus Le Peletier & Serville, 1828 from complete sequence of altitudinal vegetation only the Russian and Kazakh parts of the area. The zones in central Siberia, from steppe, forest- genus comprises rather small, slender to robust steppe, mixed forest, subalpine vegetation to species characterized by expanded, flattened front alpine vegetation. The climate is continental. The legs in the males of most species and/or with stiff winters are cold with snowfall, the summers warm bristles, modified hairs or hair tufts below on fore and mainly dry in the south, but with considerable femur. rain in north-east. The large diversity of habitats has resulted in originating of a very rich flora Most of the material has been collected by and fauna with a large number of endemics. The sweeping forest and tundra vegetation, and netting material studied shows a high number (thirty eight specimens hovering near and above mountain species) of Platycheirus in the area. tops. In recent years Malaise traps has also been an effective collecting method. The drawings were MATERIAL AND METHODS made with the aid of a drawing mirror attached to a Wild M5 stereomicroscope. Zoological Museum, Novosibirsk, had several Barkalov & Nielsen: Platycheirus species from the Altai Mountains NEW SPECIES fore tibia posterolaterally with long black bristles, the longest reaching well beyond tip of tibia. Fore Three of the following five new species, P. femur behind with long soft bristly hairs, those alpigenus sp. n., P. altaicus sp. n. and P. gunillae on apical half at least as long as those on basal sp. n. belong to the stegnus group, carinatus half. The abdominal spots are not reaching to the subgroup, given by Vockeroth (1990). The fore margin of the tergites. – P. alpigenus sp. n. stegnus group is characterized by slender legs, differs from P. setitarsis Vockeroth, 1990 in a less fore femur posteriorly with fine hairs, ventrally nosy face, in simple mid basitarsus (without black at base sometimes with a few stiff setae. Fore setae) and in a more slender abdomen. and mid tibiae posteriorly on at least apical half with a single row of short and rather weak to Description long and strong black bristles. Abdomen with Male paired subrectangular to subtriangular silvery to submetallic spots on tergites 2-4. The characters Head: Figures 1A,B. Eye angle 95-105º. Profile of the carinatus subgroup is face with uniform of face: face not much protruded but facial dusting, and with a weak to strong keel between tubercle more so than upper mouth edge. Frons, the antennal bases. P. atratus sp. n. and P. fallax face and jowls bluish black, black haired. Frons sp. n. may belong to the same group and subgroup, with light greyish yellow dusting, upper part of but are without bristles on fore and mid tibiae. face (especially below the antennae) more heavily Also the abdomen of P. atratus sp. n. is all black, dusted. Antennae black, third joint longer (1,4x) without paired spots on the tergites. However, all than wide. Arista distinctly thickenend on basal five species are included in the key below. half. Occiput moderately dusted; dorsally black haired, ventrally with whitish yellow hairs. Note: The holotypes carry a locality label with Russian and English text, the paratypes with Thorax: Figures 1C—E. Scutum, scutellum and Russian text. pleurae shining bluish black, pleurae lightly dulled by greyish white dusting. Scutum and Platycheirus alpigenus sp. n. scutellum with brown or yellow and black hairs, pleurae with yellowish pile. – Legs: mainly black; Holotype: ♂ labelled ”Алтай, 45 км восточней femorae with yellow tips, fore and mid tibia with Усть-Улагана, 2050-2200 м, 50,5 N 88.6 E 20.06. about basal 1/3 yellow, their extreme tip yellow. 2005 А. Баркалов” (= Altai, 45 km East of Ust’- Fore femur behind with long and rather soft hairs, Ulagan, 2050-2200 m, 50,5°N, 88,6°E 20.06.2005, those on apical half are at least as long as those leg. A. Barkalov). Paratypes: Ulaganskij district: on basal half. Fore tibia posterolaterally with 1 ♂ 45 km E Ust’-Ulagan settlement, 2050- black strong bristles; basal 1/3 of tibia with short, 2200 m a.s.l., 50,5°N, 88,6°E 18 June 2005 (V. apical 2/3 with long bristles, the longest reaching Zinchenko) meadow; Kosh-Agachskij district: 1 middle of basitarsus. Mid tibia posterolaterally ♂ plateau Ukok, near lake Muzdy-Bulak, 2400 m on basal 2/3 with a set of bristles, the longest a.s.l. 49,3°N, 87,7°E 29 June 2005 (V. Sorokina); reaching at least to tip of tibia. Hind basitarsus 2 ♂ upper part of Akturu river, upper border of slim but slightly thicker than tip of tibia. – Wing: forest zone, 2030-2100 m a.s.l., 50,1°N, 87,8°E 3- veins, stigma and calypter greyish yellow. Haltere 9 July 2006 (A. Barkalov) Malaise trap. Holotype blackish. and three paratypes in coll. ZMN, one paratype in coll. T.R. Nielsen. Abdomen: Figure 1F. Tergites dull black with light bluish reflections. Tergites 2-4 each with a Diagnosis: a small black species with grey, paired couple of grey spots; the spots on tergite 2 small spots on tergites 2-4. It resembles Platycheirus and roundish, those on tergites 3-4 subtriangular, gunillae sp. n. (see below) but differs as follows: wider than long and widening outwards. The Norw. J. Entomol. 55, 91–104 Figure 1G. Altai, km East of Ust’-Ulagan, 00-00 m a.s.l., type locality of Platycheirus alpigenus sp. n. Preferred environment: Tundra and high-mountain meadows with Ranunculus sp. and grasses on upper border of forest zone, figure 1G. Platycheirus altaicus sp. n. Holotype: ♂, labelled “Алтай, Кош-Агачсқий р- ң плато Укок, 2800-3000 м, 49,3 с.ш., 87,7 в.д., оқр. оз. Музды-Булак 2.07.2005, сб. A. Баркалов” (= Kosh-Agachskij district: plateau Ukok, near lake Muzdy-Bulak, 2800-3000 m a.s.l., 49,3° N, 87,7° E, 2 July 2005 (A. Barkalov)). Paratypes: 8♂, 9♀ with the same label data. Holotype and most paratypes in coll. ZM Novosibirsk, 2♂, 2♀ in coll. T.R. Nielsen. Diagnosis: similar to Platycheirus carinatus (Curran, 1927) and the nearctic P. yukonensis Vockeroth, 1990, but differing in setae of the legs, in the abdominal pattern and in all black pile of Figure 1 A–F. Platycheirus alpigenus sp. n., the body. male. A: Head in profile, B: antenna, C: fore femur, D: fore tibia and tarsus, E: mid tibia and Description tarsus, F: abdomen Male sternites shining black. Head: Figure 2A. Eye angle 95° (110° in P. yukonensis and 115° in P. carinatus), the eyes are Body length: 6,9-8,3 mm, wing length: 5,7-6,8 meeting for a distance which equals the distance mm. between the ocelli of the vertical triangle. Profile of face nosy. Frons and face bluish black, covered Female: unknown. by very light greyish white dusting, the hairs black. Antennae with first and second joint black, third Etymology: Alpigenus (latin) means coming from joint and arista brownish black. Ocellar triangle the mountains. and occiput black-haired, ventral part of occiput covered by greyish white dusting, black haired. Barkalov & Nielsen: Platycheirus species from the Altai Mountains Thorax: Figures 2C,D. Scutum, scutellum and pleurae bluish black, shining, the hairs black. – Legs all black, except for extreme tip of fore femur, base of fore tibia and fore tarsus brownish black. The hairs on the legs are all black. Basitarsus of p1 with four long posterior bristles, the last one or two with curved tips and nearly as long as the tarsal joint. Femur 1 and 2 behind each with a row of long soft and black hairs. Femur 1 below with a row of seven black stiff setae. Tibia 1 and 2 posterolaterally with long black bristles and bristly hairs. Femur 2 below in the middle with a cluster of two short strong black bristles which are not longer than apex of femur.
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