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In the years since this theory has been presented, nobody has been able to demonstrate the evolution of a single species from one to another.

Wrong. See for instance, J. R. Weinberg et al. 1992: 'Evidence for rapid speciation following a founder event in the laboratory.' Science 46(4):1214-1220.

You should have kept reading...

Rodriguez-Trelles, F., J. R. Weinberg, and F. J. Ayala. 1996. Presumptive rapid speciation after a founder event in a laboratory population of Nereis: Allozyme electrophoretic evidence does not support the hypothesis. Evolution 50(1): 457-461.

"In the years since this theory has been presented, nobody has been able to demonstrate the evolution of a single species from one to another."

"Wrong. See for instance, J. R. Weinberg et al. 1992: 'Evidence for rapid speciation following a founder event in the laboratory.' Science 46(4):1214-1220."

An actual link might have been more helpful than just quoting a page nbr out of what might be some relatively obscure text book. I googled the author and could not find this book or item.

You might have mentioned the phenomenon of certain mosquitos which have developed in the subways of London since 1863. C. pipiens C. molestus were originally of one strand of mosquito but have since diverged and can no longer reproduce when bred. They breed just fine in their own populations thus justifying a conclusion that a new species has developed in less than 150 years.

Oh, but of course that is in one of my text books.

Biology: Concepts and connections Campbell, Reece, Mitchell, Taylor. 2003 Chapter 14 "The Origin of species." page 281