Orthonevra erythrogona (Malm, 1863)

Prokhorov, A. V., Popov, G. V. & Shparyk, V. Yu., 2020, New Records Of Hover Flies (Diptera, Syrphidae) From Ukraine. Iv, Zoodiversity 54 (1), pp. 17-30 : 24

Orthonevra erythrogona (Malm, 1863) ( figs 21–26 )

M a t e r i a l e x a m i n e d. Ukraine. Sumy Region: Matskove env., 51.49 N 33.91 E, Esman River valley , 10– 15.05.2018, 4 {, 2}, 16.07.2018, 1} (M. Zaika).

D i s t r i b u t i o n: Denmark, Estonia, Finland, Germany, Latvia, Lithuania, Norway, Poland, Sweden; Russia (northern and central parts of European Russia, Southern Siberia, Russian Far East); Mongolia ( Stackelberg, 1953; Peck, 1988; Bartsch et al., 2009; Mielczarek, 2009; Haarto & Kerppola, 2014; Barkalov & Mutin, 2018; Speight, 2018; Wakkie, 2019); Ukraine (first record).

Diagnosis. Both sexes distinctly differ from other Orthonevra species by black legs with pale knees only ( figs 21, 22, 24, 25 ) (in other species, legs either entirely black or tibia pale in basal third and at apex). Orthonevra erythrogona also differs from species with bicolor legs by the basoflagellomere 2 times as long as wide ( figs 22, 23, 25, 26 ) (in other species with bicolor legs, basoflagellomere 3–4 times as long as wide).

Figures

Figs 21–26. Orthonevra erythrogona, male (figs 21–23) and female (figs 24–26): 21, 24 — habitus, dorsal view; 22, 25 — head, lateral view; 23, 26 — head, frontal view.