Cheilosia barovskii Stackelberg, 1930

Bot, Sander, Ståhls, Gunilla, Bygebjerg, Rune, Doczkal, Dieter & Vujić, Ante, 2025, Revision of the European species of the subgenus Neocheilosia Barkalov (Diptera, Syrphidae: Cheilosia), European Journal of Taxonomy 997, pp. 1-27 : 7-10

Cheilosia barovskii Stackelberg, 1930

Figs 1 , 5C, H

Chilosia barovskii Stackelberg, 1930: 223 . Type locality: “Gouv. Petrograd, Nordwest-Russland, Gatschina” (holotype ♀, ZIN, not studied, collection currently not possible to visit).

Cheilosia barovskii – Haarto & Kerppola 2014: 240. — Barkalov & Ståhls 2022: 118.

Material examined

FINLAND • 1 ♀; biogeographical province of Southern Häme [Etelä Häme EH], Valkeakoski, Sääksmäki ; 15 Jun. 1932; E. Kivirikko leg.; http://tun.fi/GAVK.2281; JKA • 1 ♀; Tavastia australis [Etelä Häme EH], Valkeakoski, Sääksmäki ; 27 Jun. 1935; E. Kivirikko leg.; http://tun.fi/GAVK.2280; JKA • 1 ♀; Southern Häme [Etelä Häme EH], Valkeakoski, Sääksmäki ; 30 May 1937; E. Kivirikko leg.; http://tun.fi/JX.925264; MZH • 1 ♀ *; Uusimaa, Sipoo; 20 May 2013; T. Järveläinen leg.; TJA .

RUSSIA • 1 ♀; Leningradskii oblast, Luschkij raion, Tolmatshevo ; 18 May 1936; [?Stackelberg]; ZISP • 1 ♂ *; Khabarovskij krai, Lake Amut ; 50.81059° N, 136.40042° E; 735 m a.s.l.; 11 Jun. 2013; J.H. Skevington leg.; CNC Diptera 229791 .

The specimens used for molecular analysis are indicated with an * (see Table 2 ).

Description

Male

Although only the female of C. barovskii has been described, the molecular evidence presented here links the described female sex with a male specimen, thus confirming its identity, allowing us to here provide the description of the male sex of C. barovskii , based on a single specimen collected in the Russian Far East.

LENGTH. Body 7 mm; wing 6.5 mm.

HEAD. Eye brownish pilose, hairs on dorsal part of eye about as long as half width of 3 rd antennal segment. Anterior eye angle ca 90°. Frons slightly swollen, with a shallow median furrow, shiny on anterior one-third, pruinose on posterior two thirds, with long, erect black hairs. Ocellar triangle about equilateral, long black pilose. Gena wide, viewed obliquely from below about as wide or slightly wider than oral cavity. Face not wide, ratio of width of face at level of facial tubercle to maximum width of head = 0.44:1; face shiny, very faintly pruinose, with a broad fascia of dense pruinosity just below base of antennae. Sides of face bare, without hairs. Parafacia narrow, at level of facial tubercle about one third as wide as 3 rd antennal segment, fully developed only lateral facial tubercle, above level of facial tubercle compressed toward eye margin by a bulge, with black hairs, hairs in upper part slightly longer than in lower part. Lunule dark-brown to black. Antenna with scape, pedicel and 3 rd antennal segment black to dark brown, 3 rd antennal segment about as long as wide. Arista black, with very short hairs.

THORAX. Scutum centrally faintly pruinose, anterior half with a pair of grey pruinose vittae, best visible if viewed from behind, laterally almost shiny; scutal hairs long black, erect, of about even length; hairs on scutellum similar to those on scutum, with marginal setae. Sub-scutellar fringe black and long. Pleurae long black pilose on posterior anepisternum, anepimeron and on katepisternum, dorsal and ventral katepisternal hair patches confluent.

WING. Membrane entirely microtrichose, hyaline; veins in basal half bright yellow, in apical half dark, basal half of RS without long dark setulae; M1 meeting R4+5 at an acute angle; calypter whitish to yellowish, with orange or brownish rim, marginal fringe on dorsal lobe partly with brown setulate. Haltere with brownish stem and yellow capitulum.

LEGS. Legs black, brownish-grey pruinose, but basal 1/4 of protibia, 1/7 of mesotibia, 1/10 of metatibia and extreme apices of femora usually reddish-yellow; hairs on femora nearly all black, but with a set of yellow hairs posteriorly on metafemur; ventral surface of metafemur with black setulate on basal 2/3, apical 1/3 with a set of antero-ventral black hairs. Tibiae mixed black and yellow pilose. Tarsi short black pilose or mixed black and reddish-brown pilose dorsally, ventral surface of pro- and metatarsi usually reddish-brown pilose, or intermixed with black hairs. Tarsi of mesoleg ventrally with black setulae.

ABDOMEN. Tergites medially brownish pruinose (best seen if viewed obliquely from front), shiny on sides of tergites 2–4; tergites 1–3 with long mixed black and yellow hairs on disc, sides of tergite 1 and anterolateral corners of tergite 2 with long yellow hairs, remainder of lateral margin of tergite 2 and entire margin of tergite 3 with black hairs, tergite 4 with black hairs. Sternites faintly greyish-brown pruinose; sternite 1 yellow pilose; base and sides of sternite 2 with long mixed black and yellow hairs, sides of sternites 3–4 long black pilose, hairs on the median parts of sternites 2–4 black and appressed.

GENITALIA. Right and left surstyli and gonostyli slightly asymmetrical; ventral margin of surstylus with a shallow basal convexity; hypandrium in lateral view about 1.2 times as long as wide; sclerite of distiphallus broadly fused dorsally, with long dorsal lobes.

Female

LENGTH. Body 6–7 mm; wing 5.4–6.2 mm.

The ♀ differs from the ♂ in the following characters: integument more shiny; pilosity much shorter. HEAD. Eye hairs short, about ¼ or less of width of postpedicel. Frons not wide, at level of lunule about 0.3 times as wide as maximum width of head, with a shallow transverse sulcus at level of about lower 1/3 of frons; lateral channels narrow, widening from inner dorsal corner of eye towards transverse sulcus, enclosing a small semicircular area of dense grey pruinosity at about median 1/3 of frons, remainder of frons shiny; hairs on frons erect, as long as one third width of postpedicel, black. Occiput dorsally much wider than in male, grey pruinose, with short black hairs. Gena long yellow pilose. Face bare, at level of facial tubercle about 0.3 times as wide as maximum width of head, shiny; parafacia orange on dorsal half, at level of tentorial groove about half as wide as diameter of protibia, pale pruinose and with short yellow hairs. Lunule orange. Scape, pedicel and 3 rd antennal segment bright orange, 3 rd antennal segment larger than in male.

THORAX. Scutum and scutellum shiny, pale pruinose sub-median vittae anterior on scutum reduced to spots; scutum with semi-erect short black hairs. Pleurae faintly grey pruinose, hairs yellow and black, shorter and less dense than in male. Calypter whitish, with orange rim and yellow fringe. Haltere with brownish or yellowish stem and yellow knob.

LEGS. Legs black, but basal 1/4 of protibia, 1/3 of mesotibia and basal 1/10 of metatibia, and often extreme apices of tibiae and femora reddish-yellow; femora with both black and yellow hairs; ventral surface of metafemur basally without black setulae; tibial hairs and tarsi as in male.

ABDOMEN. Tergites with less dense pruinosity compared to male, mainly with black hairs, except on tergite 1 and in anterolateral corners of tergite 2 with yellow hairs. Sternites lightly pruinose, short black and yellow pilose; hairs erect on sternites 1–2 and on anterior corners of sternite 3, remaining hairs more or less appressed.

Distribution

Finland, Russia.

Differential diagnosis

Similar in appearance to extralimital Cheilosia komabaensis , see Barkalov & Ichige (2016) for a differential diagnosis with that species. Similar in appearance to Cheilosia luteicornis and C. morio but differs as follows: body length shorter. Face narrower. Basal half of wing with yellow veins. Legs with less extensive yellowish parts. ♂: anterior eye angle smaller. Anterior part of frons shiny. Haltere knob yellow. Lateral margin of tergite 1 and anterolateral corner of tergite 2 with yellow hairs. Surstylus basally narrower than in C. morio , and shorter than in C. luteicornis . ♀: scape and pedicel orange. Postocular orbit dorsally with black hairs. Scutum with semi-erect black hairs. Tergites 3–4 with black hairs. Moreover, both sexes differ from C. morio by having sides of face not haired and from C. luteicornis by having parafacia above posterior tentorial pit strongly compressed.

Figures

Fig. 1. Cheilosia barovskii Stackelberg, 1930. A–C. ♂ (CNC Diptera 229791); collected in Russia. D–E. ♀ (http://tun.fi/JX.925264; THA); collected in Finland. A. Habitus dorsal view; body length 7 mm. B. Head lateral view; head height 2.3 mm. C. Head anterior view; head height 2.3 mm. D. Head lateral view; head height 2.2 mm. E. Head anterior view; head height 2.2 mm. Not to scale.

Fig. 5. Cheilosia sp., male terminalia. A–E. Left superior lobe. A. C. luteicornis (Zetterstedt, 1838). B. C. morio (Zetterstedt, 1838). C. C. barovskii Stackelberg, 1930. D. C. luteicornis. E. C. morio. F–H. Aedeagus with apodeme. F. C. luteicornis. G. C. morio. H. C. barovskii. Scale bar = 0.2 mm.