Newly-Discovered Species of Bacterium is Visible to Naked Eye
Cells of most bacterial species are around 2 micrometers in length, with some of the largest specimens reaching 750 micrometers. The newly-discovered species, named Candidatus (Ca.) Thiomargarita magnifica, has an average cell length greater than 9,000 micrometers and is visible to the naked eye.
http://www.sci-news.com/biology/thiomargarita-magnifica-10936.html
