How many named species are valid?

@article{Alroy2002HowMN,
  title={How many named species are valid?},
  author={John Alroy},
  journal={Proceedings of the National Academy of Sciences of the United States of America},
  year={2002},
  volume={99 6},
  pages={
          3706-11
        }
}
Estimates of biodiversity in both living and fossil groups depend on raw counts of currently recognized named species, but many of these names eventually will prove to be synonyms or otherwise invalid. This difficult bias can be resolved with a simple "flux ratio" equation that compares historical rates of invalidation and revalidation. Flux ratio analysis of a taxonomic data set of unrivalled completeness for 4,861 North American fossil mammal species shows that 24-31% of currently accepted… CONTINUE READING

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