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American Zoologist 1985 25(3):751-762; doi:10.1093/icb/25.3.751
© 1985 by The Society for Integrative and Comparative Biology
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Systematic Zoology: Slicing the Gordian Knot with Ockham's Razor1

WILLIAM E. DUELLMAN
Museum of Natural History and Department of Systematics and Ecology, The University of Kansas Lawrence, Kansas 66045-2454

Systematic zoology has undergone a revolution during the past 25 years. A major step was in the formulation of an explicit and objective methodology for determining phylogenetic relationships that results in testable hypotheses. The methodology of phylogenetic systematics has spawned vicariance biogeography and is applicable not only to traditional morphological characters but to new kinds of systematic characters. Innovative biochemical, cytogenetic, and developmental approaches to phylogenetic relationships have broadened the scope of systematic zoology. This diversity increases the potential for generating and testing hypotheses of phylogenetic relationships and temporal evolution.


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