Cheilosia chukotana Barkalov & Mutin, sp. n.

• Main Authors: Barkalov, Anatolij V., Mutin, Valerij A.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2014
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Insecta; Diptera; Syrphidae; Cheilosia; Cheilosia chukotana; Stripe; Anadyr; Anadyr’; Anadyr'; Chukotka
• Online Access: https://zenodo.org/record/6133314; https://doi.org/10.5281/zenodo.6133314

Cheilosia chukotana Barkalov & Mutin sp. n. (figs 3 A, 4 A–D) Type material. HOLOTYPE, ♀, labeled: Russia: Chukotka, lower reaches of river Anadyr, 64,83° N, 175,96° E, 5 m above sea level, 21.0 7.2013, leg. A. Barkalov, coll. SZM. PARATYPE: Russia: 1 ♀, same place as holotype, 21.0 7.2013, leg. A. Barkalov, coll. SZM. Diagnosis. This species (fig. 3 A) is similar to Ch. semifasciata Becker and Ch. parafasciata Barkalov, but differs in its characteristic sharply raised central knob, and by the lack of a transverse stripe and indentation in the anterior third of the frons. Cheilosia semifasciata is distributed in Europe, reaching eastwards to the Caucasus. Cheilosia parafasciata is known from the southern part of the Russian Far East (Khabarovsk and Amur Regions). Description. Female. Body length: 5.2–5.5 mm, wing length 4.9–5.1 mm. Head: Face black sharply protruding forward, shiny in lower part and with dense grey tomentum in upper part, without distinct hairs; central knob sharply raised (fig. 4 A), narrow; eye-margins broad, approximately as broad as width of pedicel, covered with dense grey tomentum (along face with narrow shiny stripe), hairs short, erect, light. Cheeks moderately high, covered with dense grey tomentum and white hairs. Frons broad (fig. 4 B), slightly swollen, without transverse stripe and indentation, longitudinal stripes fine, in the middle practically invisible, shiny in most part, only near lunula with narrow strip of grey tomentum, hairs short, erect, yellow. Lunula narrow brown; antennal pits distinctly separated. Antennae black (fig. 4 C), postpedicel rounded, covered with grey-brown tomentum; arista short, distinctly broadened in basal 1 / 3, covered with short hairs. Eyes completely covered with dense, comparatively short brown hairs in length equal to half of scapus width. Vertex covered with black or black and yellow hairs; vertical triangle equilateral. Thorax: Humeri black, with grey tomentum and light hairs. Mesonotum with grey tomentum laterally, shiny medially, covered ...