Helicidae is endmeic to Western Palearctic region. Thus no such
exchange can be argued....

Kota Erick Staal <[log in to unmask]>

> Hello mr. Lee,
>
> Your remark about C.hortensis (Müller, 1774) being autochtonous in
> N.America awoke my interest since C.hortensis is also known from
> W.Europe (I've got them in my garden near Utrecht in The Netherlands).
> It would be a 'nice' exchange: C.nemoralis exported from Europe to
> N.America and C.hortensis vice versa. Could you perhaps shed some
> further light on this?
>
> Sincerely, Erick Staal
>
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