I've a taxon with a puzzling world distribution (Tanypeza longimana) Present across northern nearctic and confined to west palaearctic where it was first described (1820). The two groups are morphologically indistinguishable so dispersal must have been fairly recent. All the sister taxa are nearctic, increasing in variety as one moves south to South America.

My guess is it came across from the nearctic via Greenland, Iceland, Faeroes etc. during the last interglacial (not the Bering route, no sign of it near there)

It has decent enough powers of flight, breeds in decaying plant debris but isn't excessively cold tolerant.

I would appreciate suggestions of papers that deal with migration of flighted insects from nearctic via that Greenland/Iceland route to the palaearctic in more recent times

Thanks