Heliozoa (superclass Sarcodina, class Actinopodea) A subclass of protozoa which have a spherical cell body from which radiate many slender pseudopodia. In some species there is a porous test, the pseudopodia extending through the pores. There are three orders, found in freshwater lakes, ponds, rivers, etc. Members of the subclass, but most commonly Actinophrys sol, are sometimes called ‘sun animalcules’.
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