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. Single filament of Ca. Thiomargarita magnifica. Image credit: Jean-Marie Volland. “Bacteria and archaea are the most diverse and abundant organisms on...