Abstract
Abstract In the past two decades there has been a dramatic change in the practice of classifying organisms based on a rigorous, new methodology called cladistics, which defines relationships based on the distribution of shared derived characters. This approach, coupled with new information, has led to changes in our concepts of the relationships of major fish groups. These changes should be reflected in newer classifications and lists. For many purposes it is desirable to list related taxa together so that it is easy to make comparisons among them. The order in which taxa are listed is important as an indication of relatedness. Some variations in arrangement are equivalent and interchangeable; others imply relationships that are contrary to available evidence and must be rejected.
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