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Protozoans are also strictly non-multicellular and exist as either solitary cells or cell colonies. Nevertheless, some colonial organisms (e.g., Dictyostelium discoideum, supergroup Amoebozoa) exhibit high levels of cell specialization that border on multicellularity.
Protozoa, as traditionally defined, are mainly microscopic organisms, ranging in size from 10 to 52 micrometers. Some, however, are significantly larger. Among the largest are the deep-sea dwelling xenophyophores, single-celled foraminifera whose shells can reach 20 cm in diameter.