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The only Parasyrphus on the Icelandic list is Parasyrphus tarsatus.
Is that an option? What's diagnostic of that species?

Other observations of hoverflies in Iceland have been noted as being dark on iNaturalist. When I raised this with Erling Olafsson at the National Institute here, he said it was very typical for Icelandic specimens that they would be darker than their continental equivalents.