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

any ameba of the genus Endamoeba

marine protozoan having a rounded shell with spiny processes

large fossil protozoan of the Tertiary period

any of diverse minute acellular or unicellular organisms usually nonphotosynthetic