any of diverse minute acellular or unicellular organisms usually nonphotosynthetic

creeping protozoans: amoebas and foraminifers

naked freshwater or marine or parasitic protozoa that form temporary pseudopods for feeding and locomotion

marine microorganism having a calcareous shell with openings where pseudopods protrude

any of various rhizopods of the order Testacea characterized by having a shell

creeping protozoans: amoebas and foraminifers