Platycheirus dudkoi, Barkalov & Nielsen & V. & R., 2009

Barkalov, Anatolii V., Nielsen, Tore R., V., A. & R., T., 2009, New material of Central Palaearctic Platycheirus (Diptera, Syrphidae) with description of three new species, Norwegian Journal of Entomology 56, pp. 1-8 : 1-3

Platycheirus dudkoi sp. n.

Figures 1A–D , 2 .

Holotype: Male, labelled in Russian letters “Republic Altai, Ulaganskij district, Kurajskij mountain range, 2500–2800 m a.s.l. 50,33° N, 87,75° E, tundra 1.– 4.07.2008 leg. R. Dudko.” The holotype is kept at ZMN.

Diagnosis and comparison with related species: fore and mid tibia with short hairs only, without posterolateral bristles and thus similar to male P. fallax Barkalov & Nielsen, 2008 . P. dudkoi sp. n. differs from fallax in body hairs all white (mainly black in fallax ), thorax and hind part of frons steel blue (dark greyish in fallax ), hairs on head and thorax white (black in fallax ), dusting on frons whitish (grey in fallax ), haltere pale orange yellow (greyish brown in fallax ) and abdomen with dull, light grey bands (dull grey spots in fallax ).

Description

Male

Head: Figure 1A–B . Eye angle 110°, frons heavily dulled by white dusting, the hairs white. Antennae black; 3 rd segment short, scarcely as long as wide. Face, genae and occiput dulled by greyish white dusting; white haired.

D

Thorax: Figure 1C . Scutum, scutellum and pleurae bluish black, somewhat dulled by greyish white dusting, the hairs are white. – Wings: wing cells br and bm microtrichose, except for anterior part of br and extreme base of bm bare. Haltere pale orange yellow, calypter whitish yellow. – Legs all black, only the knees narrowly yellow. Tibia 1–2 without bristles, only with short whitish yellow hairs. Fore femur behind with white hairs, none of the hairs are longer than thickness of femur. Hind femur with long white hairs.

Abdomen: Figure 1D . Tergites 2–5 black with broad and dull, light greyish bands; the terminalia shining black. Sternites metallic bluish black with light dusting. The hairs on tergites and sternites white.

Body length: (from frons till tip of abdomen) 8.5 mm. Wing length: 6.3 mm.

Female: unknown.

Etymology. The species is named after Dr. Roman Y. Dudko, Novosibirsk who participated in several expeditions to high mountain areas, and who collected this unknown Platycheirus .

Ecology: The specimen was caught on high mountain tundra, hovering near stones ( Figure 2 ).

Figures

Figure 1. Platycheirus dudkoi sp. n., male holotype. A: head in laterial view; B: antenna; C: hind basitarsus; D: abdomen.

Figure 2. The collecting site for Platycheirus dudkoi sp. n.