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Cladistics
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The methods and terminology of phylogenetic systematics explained by the magazine Fossil News.
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What is Cladistics? You pick up an article in the Journal of Vertebrate Paleontology on a new species of ground sloth. The next thing you know, you're confronted with symplesiomorphies, autapomorphic characteristics, and paraphyletic groups. And some very...Cladistics is a particular method of hypothesizing relationships among organisms based on the idea that members of a group share a common evolutionary history.
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Introduction to Cladistics This module provides a brief introduction to the philosophy, methodology, and implications of cladistic analysis. Many of the terms that you will see along the way are high-lighted, e.g evolution, which means that they are...Society of scientists studying cladistics.
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Willi Hennig Society   Free counter...Short introduction from the American Museum of Natural History.
http://www.amnh.org/exhibitions/Fossil_Halls/cladistics.html
Introduction to various phylogenetic statistical methodologies.
http://research.amnh.org/~siddall/methods/