Since the Victorian era, categorizing the natural world has challenged scientists. No group has presented a challenge as tricky as the protists, the tiny, complex life forms that are neither plants ...

Organisms whose cells have a nucleus — eukaryotes — have traditionally been separated into four ‘kingdoms’; now they have been reorganized into six. The authors of the revision hope that it will bring ...

Marine protists encompass a vast array of unicellular eukaryotes that form the foundation of oceanic food webs and drive global biogeochemical cycles. Recent advances in environmental sequencing and ...