Anderson, O.; Gastrich, M. D.; Amaral Zettler, L. (1999). Fine structure of the colonial radiolarian Collozoum serpentinum (Polycystinea: Spumellaria) with a reconsideration of its taxonomic status and re-establishment of the genus Collophidium (Haeckel). Marine Micropaleontology. 36(2-3): 81-89.
Fine structure of the colonial radiolarian Collozoum serpentinum (Polycystinea: Spumellaria) with a reconsideration of its taxonomic status and re-establishment of the genus Collophidium (Haeckel)