Definition from Wiktionary, the free dictionary
See also: radiolaria
- A taxonomic subclass within the class Actinopodea — the radiolaria, numerous species, most of them extinct, of minute zooplankton, many with distinctive mineral skeletons useful for dating stratigraphic layers.
- There position of this taxonomy is under dispute. It is sometimes given as a subphylum of Radiozoa or of Retaria.