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or else we are being sold an absolutely fictitious bill of goods which RAZD's link which tells a very pretty story about the alleged documentation of 40 million years of Pelycodus evolution, but is in fact a blatant and fraudulent fairy tale based on no science what so ever
The splitting of the population into different clusters based on size is what is evidence of the speciation event.
RAZD's saying with reference to alleles that the change is gradual. He is assuming that size in Pelicodus was determined genetically. This seems to be what you're objecting to as an assumption. Do you in fact object to this? Do you think it's unreasonable to assume that an extinct organism had genes? or that it's unreasonable to assume that its size was under genetic control? Or both?
By the way, this is very much a side issue - the evidence is the change in size distribution.