on Viola arvensis - ant dirvinės našlaitės
https://en.wikipedia.org/wiki/Sphaerophoria Species slender 5.6-12mm long with extremely large hemispherical male terminalia after which the common name globetail has been created. There are bright yellow markings on head and thorax and usually on the abdomen, but some species have a black abdomen. The larvae are aphidophagous.
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