Van Soest, R.W.M. (1987). Phylogenetic exercises with monophyletic groups of sponges. In Vacelet, J.; Boury-Esnault, N. (eds) Taxonomy of Porifera from the N.E. Atlantic and Mediterranean Sea. NATO ASI Series G13. Springer Verlag, Berlin Heidelberg. p.. 227-241.

145881

Van Soest, R.W.M.

1987

p.. 227-241

Publication

Proceedings of the 2nd Workshop on Atlanto-Mediterranean Sponge Taxonomy

Available for editors   [request]

The classification of the Porifera is critically evaluated using cladistic princip1es. The (syn-)apomorphic characters and character states are established for 34 groups of Porifera which are generally accepted as monophyletic. These characters/states are compared with the currently accepted classification of Hartman (1982), resulting in the conclusion that there are many non-parsimonious homoplasies included. Two consecutive attempts to amend this are presented. The first consists of a self-constructed strictly cladistic classification characterized by the assumption of many assumed losses. The second is a computer-based analysis characterized by a neutral construction of a classification with the least number of assumed homoplasies.

Phylogeny, Phylogenesis

Porifera

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