The International Institute of Species Exploration reports 1,922,710 living species on Earth.
Added on 2010-05-26 15:30:51 by Appeltans, Ward
Their 2010 annual report "State of Observed Species (SOS)" makes on overview of nearly two million species of which one million are insects. In 2008, 18,225 living species and 2,140 animal fossil species were described as new to science. WoRMS is now an official data partner.