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Any of various aquatic, chiefly freshwater protozoans formerly classified in the class Heliozoa, characteristically having numerous spindlelike pseudopods that radiate from a central cell mass.

[From New Latin Hēliozōa, former class name : helio- (from their shape) + -zōa, pl. of -zōon, -zoon.]

he′li·o·zo′ic (-zō′ĭk) adj.


(Animals) any protozoan of the mostly freshwater group Heliozoa, typically having a siliceous shell and stiff radiating cytoplasmic projections: phylum Actinopoda (actinopods)


(ˌhi li əˈzoʊ ən)

1. any protozoan of the order Heliozoa, having a spherical body and radiating pseudopodia.
2. Also, he`li•o•zo′ic. of or pertaining to the heliozoans.
[1890–95; < New Latin Heliozo(a) (see helio-, -zoa) + -an1]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.heliozoan - protozoa with spherical bodies and stiff radiating pseudopods
actinopod - protozoa having stiff rodlike radiating pseudopods
Heliozoa, order Heliozoa - mostly freshwater protozoa
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Six species belonging to the heliozoan genera Acanthocystis, Pinaciophora, Pterocystis, Raphidocystis, and Raphidiophrys were observed from various northen Indiana freshwater sites (Table 1, Figs.
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