Cheilosia (Cheilosia) nebulosa Verrall, 1871

Prokhorov, A. V., Popov, G. V., Shparyk, V. Yu. & Vasilyeva, Yu. S., 2020, New Records Of Hoverflies (Diptera, Syrphidae) From Ukraine. V, Zoodiversity 54 (3), pp. 237-258 : 242-244

Cheilosia (Cheilosia) nebulosa Verrall, 1871 ( figs 22–25 )

= langhofferi Becker, 1894

M a t e r i a l e x a m i n e d. Ukraine. Zakarpattia: Kamianytsia env., 48.70 N 22.43 E, Uzh River valley (left bank), 6.05.2017, 1} (G. Popov); Kyiv Region: Mygalky env., 50.655 N 29.495 E, Teteriv River floodplain, 17.04.2020, 1 {, 1} (A. Prokhorov) .

D i s t r i b u t i o n: Belarus, Belgium, Bosnia and Herzegovina, Bulgaria, Croatia, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Great Britain, Hungary, Ireland, Italy, Latvia, Lithuania, Montenegro, Norway, Poland, Romania, Serbia, the Slovak Republic, Slovenia, Sweden, Switzerland; Russia (northern and central European part, Western and Central Siberia) ( Bańkowska, 1963 (also as langhofferi ); Peck, 1988; Verlinden, 1991; Maibach et al., 1992; Kuznetzov, 1993; Dirickx, 1994; Belcari et al., 1995; Vujić, 1996; Holinka & Mazánek, 1997; Nielsen, 1999; Stubbs & Falk, 2002; Stănescu & Pârvu, 2005; Pakalniškis et al., 2006; Bartsch et al., 2009 b; Mielczarek, 2009 –2020; Tóth, 2011, 2014 (also as langhofferi ); Ball & Morris, 2014; Borodin & Borodina, 2014; Haarto & Kerppola, 2014; Barkalov & Mutin, 2018; Miličić et al., 2018; Speight et al., 2018; Speight, 2020; Wakkie, 2020); Ukraine (first record).

Diagnosis. Cheilosia nebulosa belongs to Cheilosia species group C ( Claussen & Speight, 1988; Bartsch et al., 2009 b). It has following characters: compound eye at least partly pilose, lower part of the face without pile, posterior edge of scutellum without setae. This species is similar to C. chrysocoma (Meigen, 1822) and C. subpictipennis Claussen, 1998 in having wing darkened in the middle, at least around crossvein r-m.

From C. chrysocoma , the female of C. nebulosa differs by: first flagellomere with rounded apex ( fig. 25 ) (in C. chrysocoma , first flagellomere with angular apex, sometimes it may be poorly noticeable); face more or less parallel-sided ( fig. 24 ) (in C. chrysocoma , face distinctly expands down); mesonotum with short yellowish pile ( fig. 23 ) (in C. chrysocoma , mesonotum with long reddish pile); katepisternum with lower and upper parts of pile widely separated (in C. chrysocoma , katepisternum with lower and upper parts of pile more or less confluent); abdomen with not so dense, yellowish pile, shorter than thickness of the femur ( figs 22, 23 ) (in C. chrysocoma , abdomen with dense, usually reddish pile, longer than thickness of the femur); ( Bartsch et al., 2009 b, Van Veen, 2010).

Cheilosia nebulosa can be separated from C. subpictipennis Claussen, 1998 by first flagellomere with dorsal margin and apex dark ( fig. 25 ) (in C. subpictipennis , first flagellomere entirely pale) ( Van Veen, 2010).

Specimens of this species with unmarked wing (as our specimen on fig. 22 ) have also appeared in literature under the name C. langhofferi Becker, 1894 ( Speight, 2020) . This taxon has been synonymized with C. nebulosa by Claussen & Speight (1988).

Note. In Great Britain, this species is listed under the UK Biodiversity Action Plan and qualifies as Nationally Scarce ( Ball & Morris, 2014).

Figures

Figs 22–25. Cheilosia nebulosa female:22 — habitus, dorsal view; 23 — habitus, lateral view; 24 — head, frontal view; 25 —head, anterolateral view.