Heliozoa

from The Century Dictionary.

• A name proposed by Hertwig and Lesser for the sun-animalcules, fresh-water organisms provided with radiolarian skeletons, and grouped by Huxley with the marine Radiolaria. Some divide them into three families, Actinophryidæ, Acanthocystidæ, and Clathrulinidæ. See Radiolaria.

from the GNU version of the Collaborative International Dictionary of English.

• noun plural (Zoöl.) An order of fresh-water rhizopods having a more or less globular form, with slender radiating pseudopodia; the sun animalcule.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• proper noun A taxonomic phylum within the subkingdom Biciliata — the heliozoans.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun mostly freshwater protozoa