Order of rhizopods, usually having a siliceous skeleton, or shell, and sometimes radiating spicules. The pseudopodia project from the body like rays. It includes the polycystines. See Polycystina.

Group or order of microscopic organisms having an amoeba like body with radiating pseudopodia and an unusually elaborate skeleton.

single-celled planktonic organisms that build a skeleton of silica

marine protozoa