This is remarkably similar to what I was arguing on Taxacom a while ago: Rieppel, O. 2010: Species monophyly. Journal of zoological systematics and evolutionary research, 48: 1-8. doi<http://en.wikipedia.org/wiki/Digital_object_identifier>: 10.1111/j.1439-0469.2009.00545.x<http://dx.doi.org/10.1111%2Fj.1439-0469.2009.00545.x>