Known and Unknown Species
This graph shows how many species discovered (dark green) versus estimated species remaining to be discovered. This does not include many microscopic eukaryotic groups.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"Undiscovered species chart."
http://commons.wikimedia.org/wiki/File:Undiscovered_species_chart.png
Wikimedia
Public domain.
