Acta Zoologica Cracoviensia, 20() 1975
On the Phylogenetic Classification
Abstract:
An axiomatization of the logics of phylogenetic classification, based largely on Hennig’s theory of cladism, is presented. It is shown that in principle two different methods can be employed for the purpose of phylogenetic classification, both of which are presently used. The first one, the quantitative approach is, essentially, the one employed in numerical taxonomy. The second one, the qualitative method, involves an evaluation of the phylogenetic importance of various sets of taxonomic characters. It is the one most widely used at the time being, and it may lead to correct results, but mistakes cannot be excluded. In the last section are discussed the implications for the species concept of the view propounded.
