Dasysyrphus neovenustus Soszyński & Mielczarek, 2013

Prokhorov, A. V., Popov, G. V., Shparyk, V. Yu. & Vasilyeva, Yu. S., 2023, New Records Of Hoverflies (Diptera, Syrphidae) From Ukraine. Vi, Zoodiversity 57 (2), pp. 125-142 : 137-138

Dasysyrphus neovenustus Soszyński & Mielczarek, 2013 ( figs 59–62 , 67, 68 )

M a t e r i a l e x a m i n e d. Ukraine. Lviv Region: Ivano-Frankove env., 49.919882 N 23.694835 E, Roztocze Nature Reserve , edge of mixed forest, 31.05.2008, 1 ♀ (A. Lishchuk) ; Rivne Region: Mosty, 50.305611 N 26.191243 E, Zbytynka River bank, 23.05.2019, on flowers of Achillea sp. , 1 ♀ (A. Prokhorov); Hrabun env., 51.545978 N 27.200158 E, glades in mixed forest (with flowering Ledum palustre ) near raised bog, 29.05.2021, 1 ♀ (A. Prokhorov) ; Kyiv Region: Dibrova env., 50.194443 N 30.203628 E, 30.04.2010, 1 ♀ (M. Zaika); Potashnia env., 50.714263 N 29.737106 E, Tal River floodplain forest, 21.05.2015, 1 ♂; Irpin env., 50.502987 N 30.280007 E, Lyubka River floodplain forest, 25.04.2019 ,1 Ơ; Kotsiubynske env., 50.471860 N 30.307640 E, clearing in mixed forest, 17.04.2016, 6 Ơ, 3 ♀, 29.04.2020, 1 ♀; Mygalky env.: 50.656597 N 29.500061 E, mixed forest near Teteriv River floodplain, 28.04.2018, 2 ♀; 50.656767 N 29.497360 E, Teteriv River floodplain, 13.04.2020, 1 ♀, 4.05.2020, on flowers of Salix sp. , 1 ♀; 50.655066 N 29.494565 E, edge of Teteriv River floodplain forest, 23– 24.04.2020, 3 Ơ; 50.652546 N 29.488046 E, Teteriv River floodplain forest, 15.05.2020, on flowers of Cardamine sp. , 1 ♀; 50.651726 N 29.488654 E, boundary between mixed forest and Teteriv River floodplain forest, 17.05.2020, 1 ♀; Nova Buda env., 50.684214 N 29.708405 E, swampy glades in mixed forest, 5.05.2021, on flowers of Caltha palustris , 2 Ơ (A. Prokhorov) .

D i s t r i b u t i o n. Czechia, Finland, France, Germany, Great Britain, Ireland, the Netherlands, Norway, Poland, Slovakia, Sweden, Switzerland; Russia (Northwest European part, Baikal Lake) ( Soszyński et al., 2013; Barkalov & Mutin, 2018; Speight, 2020; Mazanek et al., 2021); Ukraine (first record).

The species is probably underrecorded because it is only recently described, before that is it likely to be identified as Dasysyrphus venustus (Meigen, 1822) .

Diagnosis. Dasysyrphus neovenustus is very similar in appearance to D. venustus ( figs 63–66 , 69, 70 ), especially in dorsal and lateral view ( figs 59–62 ). Ventrally, it clearly differs by black rectangular band on posterior part of sternite 2 ( fig. 67 ) (in D. venustus , sternite 2 with a small irregular oval or triangular spot, which is usually transversely elongated, as on fig. 69 ). Also the D. neovenustus male can be separated from the male of D. venustus by: hind femora black from base to half of their length ( fig. 68 ) (in D. venustus , hind femora black from base to 3/4 of their length, as on fig. 70 ); hind tibia yellow ( fig. 68 ) (in D. venustus , hind tibia dark at mid-length, as on fig. 70 ); pterostigma yellowish ( figs 59, 60 ) (in D. venustus , pterostigma brownish, as on figs 63, 64 ). According to Soszyński et al. (2013), the female of D. neovenustus differs from D. venustus female by frons with small and weakly marked pollinose spots (in D. venustus , frons with distinct pollinose spots). However, some of our specimens of D. neovenustus have the frons with normal developed pollinose spots. As the study of our specimens shows, the most stable features are the black band on sternite 2 and color of the pterostigma.

Dasysyrphus neovenustus occurs earlier in the spring than D. venustus ( Soszyński et al., 2013) , and this coincides with our observations. According to our data, the earliest record of D. neovenustus was on April 13, while the earliest record of D. venustus was on April 23.

Acknowledgements

We are very grateful to Anastasia Lishchuk (Kamyanets-Podilsky Ivan Ohienko National University) and Myroslav Zaika for the collected material. The authors also thank Valery Korneyev (Institute of Zoology, NAS of Ukraine, Kyiv) for valuable scientific and editorial comments. We also very appreciate critical notes and corrections of two anonymous referees to improve this manuscript.

Figures

Figs 59–66. Dasysyrphus neovenustus (59–62) and D. venustus (63–66): 59, 63 — male habitus, dorsal view; 60, 64 — female habitus, dorsal view; 61, 65 — male habitus, lateral view; 62, 66 — female habitus, lateral view.

Figs 67–70. Dasysyrphus neovenustus (64, 65) and D. venustus (66, 67): 67, 69 — female abdomen, ventral view; 68, 70 — male left hind leg, lateral view.