Cercozoa (Cercozoans) is a phylum of rhizarians. There are 706 species of Cercozoans, in 205 genera and 49 families. It includes groups like Metromonadea, Imbricatea, and Thecofilosea.
Definition: number of currently described and taxonomically accepted marine species in this clade (Appeltans et al. 2012. The Magnitude of Global Marine Species Diversity. Current Biology 22, 2189–2202. http://dx.doi.org/10.1016/j.cub.2012.09.036)