And then on to the M. Habib replies:
Probably the idea is that if taxa are too distant phenetically -- that is, by a subjective, intuitive estimate of phenetic distance, not even by any attempt at quantification --, they can't be sister-groups. ...
--Mike
Michael Habib, M.S. PhD. Candidate Center for Functional Anatomy and Evolution Johns Hopkins School of Medicine 1830 E. Monument Street Baltimore, MD 21205 (443) 280-0181 habib@jhmi.edu