SOS Report - 2009

The State of Observed Species (SOS) Report is issued annually in partnership with the International Commission on Zoological Nomenclature, the International Plant Names Index, Thomson Reuters (publisher of Zoological Record) and the International Journal of Systematic and Evolutionary Microbiology.

The SOS is a report card on the status of our knowledge of earth’s species and summarizes the number of species newly described in the most recent year for which complete data are available. SOS 2009 (PDF Format) was released on May 22, 2009 and provides summary data for 18,516 new species described in calendar year 2007.

Please note that the PDF is large and may take a few seconds to download.