cytocladus cytocladus cytocladus is a radiolarian genus reported in the family thalassothamnidae. the genus contains bioluminescent species. cytocladus scientific classification domain: eukaryota clade: diaphoretickes clade: sar phylum: retaria class: polycystinea order: spumellarida family: thalassothamnidae genus: cytocladus species 1; see text species the following species are recognized (incomplete list): cytocladus major schröder, 1907