> How did it get here? One theory has it that there was late Tertiary and
> Pleistocene uplift of the Arctic lands and a land bridge existed from
> Scotland to Iceland to Greenland to Labrador. Such a connection might also
> explain the European-Eastern North American distribution of other
> landsnails, e.g., Zoogenetes harpa, certain Euconulus spp., Pupilla
> muscorum, certain Vallonia spp., etc.

Unfortunately such landbridges are relics of preplate tectonic
thinking, and are extremely unlikely. I would consider migrations
across the Bering strait, which has been closed at times, with Siberia
and Alaska in contact.

--
Regards
Andrew Grebneff
Dunedin
New Zealand
Fossil preparator
Mollusc, Toyota & VW van fan

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