Ventricaria ventricosa
Ventricaria ventricosa is one of the largest known unicellular organisms. They about the size of a ping pong ball.
Source
Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:
"Ventricaria ventricosa."
http://commons.wikimedia.org/wiki/File:Ventricaria_ventricosa.JPG
Wikimedia
Public domain.
