Abstract
The purpose of the report is to show that there is reason to consider asymmetrical phylogenetic trees a priori at least as probable as symmetrical ones. A single bifurcation of a phylogenetic tree is treated, the asymmetry of which can be judged simply through comparing the numbers of terminal species belonging to the 2 monophyletic sister groups produced by the bifurcation. It must be assumed that the terminal species belonging to the considered sister groups have been sampled in such a way that the asymmetry of the classification can reasonably be predicted from evolutionary considerations alone.

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