[ahayes]

The evidence in the paper of absence of interbreeding is consistent with speciation. The disagreement you noted is because C. pipiens has a tendency to colonize underground areas and produce local C. molestus subtypes. The difference is that in other geographic areas (the Mediterranean, for instance) the two populations resulting can interbreed (meaning in the Mediterranean C. pipiens and C. molestus would be "the same species, with any differences being purely physiological variation" or at the most "subspecies or semispecies"). The total absence of interbreeding between London C. molestus and C. pipiens discovered in this paper would classify the two populations as distinct species.

So yes, I do have proof, and there it is.

[Greg F]

Does the molestus subgroup in London interbreed with the molestus subgroups not in London? If so it is the same species. Then if it is the same species, and that species interbreeds with pipiens, the two species are one. The molestus subgroup is just hard to breed with pipiens, as I said earlier, the chihuahua and the wolf . . . not an easy mating, but same species.