collozoum collozoum collozoum is a radiolarian genus formerly reported in the subfamily sphaerozoidae, now reported descending from the order collodaria. the genus contains bioluminescent species. it is a genus of colonial radiolarians (as opposed to solitary). collozoum illustration of collozoum inerme scientific classification domain: eukaryota clade: diaphoretickes clade: sar phylum: retaria class: polycystina order: collodaria genus: collozoum species 1; see text species the following species are recognized: collozoum inerme (j. müller, 1856)