The species in question has left no footprint in western North
America or N Asia.

Harry


At 04:21 PM 11/29/2009, you wrote:
> > 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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