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Re: Taxonomy (long)

In a message dated 95-12-15 14:24:34 EST,Chip Prezma writes:

<<I believe there are such occurences <sic> also in North American frogs
along the east coast(?).>>

I know that the leopard frogs of the Missisippi River valley have 8 species
in a cline (or chain) which are virtually indistinguishable from each other
but only adjoining species are capable of mating successfully.  Nevertheless,
genes can move in both directions up and down the valley from species 1 to 8
(or from 8 to 1) even though 8 and 1 cannot mate successfully together.