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Willi Hennig The Willi Hennig Society founded in 1980 is a forum for advancing the science of phylogenetic systematics. The Society provides the opportunity for diverse workers from every area of systematics to debate within a cladistic framework aspects relating to both systematic practices and applications of systematics such as paleontology historical biogeography evolutionary morphology ecology or conservation biology. Our members combine an interest in the principles of systematics with a strong sense of the importance of empirical work. The exchange of ideas occurs at annual meetings and in the pages of the Societys journal Cladistics.