thalassicolla thalassicolla thalassicolla is a radiolarian genus reported in the thalassicollidae. the genus contains bioluminescent species. it is a genus of solitary (not colonial) radiolarians. thalassicolla scientific classification domain: eukaryota clade: diaphoretickes clade: sar phylum: retaria class: polycystinea order: nassellaria family: collozoidae subfamily: thalassicollidae genus: thalassicolla species 1; see text species the following species are recognized (incomplete list): thalassicolla nucleata huxley, 1851