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"As for hierarchical systems expressing natural phyletic clades - what makes you all so sure there are clades in nature ?" Well, unless you believe in multiple parallel origins of life, followed by either 1) entirely linear, non-branching, ancestor-descendant sequences down to the present day, or; 2) a reticulate mode of evolution were new species always arise from hybridisation, there will be SOME clades out there somewhere! Merry Christmas and a Happy New Year to you all! Per Erik Ahlberg Senior Research Fellow Department of Palaeontology The Natural History Museum Cromwell Road, London SW7 5BD, UK E-MAIL ADDRESS: pea@nhm.ac.uk
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