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Comment directly from Bill Dean on iNaturalist :

" this has a black facial stripe which is lacking in tarsatus. It looks very much like Parasyrphus punctulatus.
The markings on tergite 2 are very pointed compared to tarsatus and the anterior margin more oblique than tarsatus and tarsatus has the hind legs more extensively yellow."

Confusingly, this is another not on the Icelandic list though, so would be a new species for country.