1 Papanin Institute for Biology of Inland Waters, Russian Academy of Sciences, Borok, 152742, Russian Federation. Electronic address: tikho-denis@yandex.ru.
2 Belozersky Institute for Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, 119234, Russian Federation; Kharkevich Institute for Information Transmission Problems, Russian Academy of Sciences, Moscow, 127051, Russian Federation.
3 Department of Biology, University of Victoria, Victoria, V8P5C2 BC, Canada.
4 Department of Botany, University of British Columbia, Vancouver, V6T1Z4 BC, Canada.
Tikhonenkov et al. introduce the Provora-a newly described, yet ancient, supergroup of unicellular protists encompassing as much genetic diversity as animals and fungi combined.