he·li·o·zo·an 
(hē′lē-ə-zōən)
(hē′lē-ə-zōən)n.
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·zoic (-zōĭk) adj.