an answer to paraphyly
panzar at CLPGH.ORG
Mon Jun 16 09:39:18 CDT 1997
>BUT... what if we could travel back in time and collect specimens of tthose
>mainland populations BEFORE dispersal and establishment of P. fernandeziana?
>Back in the herbarium, we compare our time-machine-retrieved specimens to
>current ones. Do we say, "Jeepers! These specimens from 500,000 B.C (or
>whatever) are a whole different species! Look at how different they were
>before Planta fernandeziana diverged"?
And if we're dealing with species of short generation time (such as
invertebrates or herbs), I don't thing we necessarily need a time machine.
Look at specimens from older museum collections, and I'll bet someone could
document a case such as this--a taxon with little or no discernable changes
so far and a closely-related taxon that didn't exist at the time of the early
Robin K Panza panzar at clpgh.org
Section of Birds, Carnegie MNH
Pittsburgh PA 15231 USA
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