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Northern Germany, Schleswig-Holstein, Bellin (east of Kiel), little place, where cut wood wait for removal, around with many old oaks; found at the low vegetation like Urtica sp., grass, Fallopia japonica; nearby a mixed forest (Douglasie, Oaks, Beeches) and a pasture.
First specimen at a leaf of Urtica sp., the second at a plant of Alliaria petiolata, 18th of May 2023, (Photos - kuv). Checking the WWW I only found one black hoverfly with such red/orange abdomen: Psarus abdominalis; but this shall be "disappeared" since 1995. Please help to get the ID.
Kuv