[Taxacom] Ladderising phylogenetic trees

[Richard Zander]

Well, okay, say anagenesis is gradual evolutionary change, and say
cladogenesis is a split. You must have both to get speciation unless you
have fossils or a time machine to see what the ancestor looked like
before anagenesis alone forced descendants into a different species
according to some species concept. 

If we have a split alone, unless the products change (in my opinion
something more than non-coding base changes), we get two isolated
populations of the same species. If "split" means both anagenetic and
cladogenic processes are involved, we have no argument.

Clearly the original thought about "anagenetic evolution" was not clear,
more a slogan along the lines of "all splits are speciation" which is
untrue as abundantly demonstrated in publications on molecular
evolution.