a phylum of single-celled aquatic animals that are related to the radiolarians. They have a spherical shell with fine radiating needle-like projections.
Class Heliozoa, phylum Actinopoda, kingdom Protista
Origin:
modern Latin (plural), from Greek hēlios 'sun' + zōion 'animal'
Heliozoa in other Oxford dictionaries
Definition of Heliozoa in the US English dictionary
