Abstract: The Median Elimination Series method differs from those of other cladists both theoretically and technically. The principle of parsimony is one of the bases of scientific hypotheses; the theory of evolution is the causal explanation relationships between organisms. Both of them are the bases of cladistics. Thus it is implausible to replace the for- mer by the latter. Distinguishing a plesiomorphy from a reversion and a direct apomorphy from a cyclic apomorphy as indicated by Dr Li (1990) in his character 5 and character ll, is difficult if not impossible. So the basis of MES is vulnerable. Using only 2 taxa in calculating the value of media and thus deciding the placement of a taxon in a cladogram would bring uncertainties when reversion exists. Morphological character homoplasy and reversion must be treated equally if Wagner's parsimony principle is followed. But reversion is ignored in MES calculation. Several more parsimonious cladograms are yielded with Dr Li's data when Farris's method is followed. MES is not a better alternative anyway.

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