Might it not be the other way around.  They survived because of the
remoteness of Norfolk Island?
 
Sylvia Edwards
 
Dr Robert Victor Johannes Varman wrote:
>
> I'd just like to thank Aydin Orstan for sharing the site regarding 'flying
> snails'. I'm still trying to work out how all those species of snails ended
> up on Norfolk Island - among the most remote islands in the world. I
> believe that some species may be explained by former land bridges but that
> doesn't explain all species (not including those brought over by Europeans
> and Polynesians). Wishing Aydin all the best in his studies,
>
> Rob
>
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