1 Biology Centre, Institute of Parasitology, Czech Academy of Sciences and Faculty of Sciences, University of South Bohemia, 37005 České Budějovice (Budweis), Czech Republic; Canadian Institute for Advanced Research, Toronto, ON M5G 1Z8, Canada.
2 Biology Centre, Institute of Parasitology, Czech Academy of Sciences and Faculty of Sciences, University of South Bohemia, 37005 České Budějovice (Budweis), Czech Republic.
Lukeš et al. introduce an enigmatic group of unicellular eukaryotes called the diplonemids, which according to recent surveys may be widespread in marine ecosystems.