Paul Monfils wrote, "It is difficult for me to appreciate that in the overall scheme of nature, a different process is involved in the production of new phyla or classes than is involved in the production of new genera and families. I thought taxonomy viewed this as a continuum?" Thank you, Paul, that bothered me too. It is indeed a continuum. I suspect that someone got tenure on the basis of "discovering" the differences between microevolution and macroevolution. Old wine in new bottles, to my way of thinking; or at least old shells with new labels. Andrew K. Rindsberg Geological Survey of Alabama