It is true that geographically or otherwise isolated populations Can, over
time, become distinct sub-species or even species. However, that depends on
the amount of time isolation has been in effect. If the time is relatively
short then evolution would not have time to create a differentiation large
enough to tell the isolated colony from the original.

Amphidromus perversus colonies stretch from Sumatra through Java and Bali
and into Borneo and Sulawesi(Celebes). There could be hundreds of colonies
isolated on islands, between mountain ranges etc. Some may have been
separated from the main stock for thousands of years, some maybe only a few
years. Trying to determine how closely related  different colonies are could
probably only be done by DNA analysis.

 Pete

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