DEFINITION OF PROTOZOA

The diverse phylum of single-celled organisms

that includes the foraminifera, radiolaria, thecamoebians,

silicoflagellates, and tintinnids, and their fossil records.

Most protozoa are soft-bodied and do not leave a fossil

record. Modern zoological classifications regard the protozoa

as a subkingdom of the Animalia Kingdom, excluding

the algae, whereas paleontologists include these and other

botanical groups with the protozoa. Geologists and paleontologists

include botanical unicellular organisms such as

acritarchs, calcareous nannofossils, chitinozoans, diatoms,

and dinoflagellates in this phylum and refer to them by the

terms protozoans or protistids. The protistids are descendants

of the early and simple prokaryotes from the Archean,

but since the early forms were soft-bodied, they rarely leave

fossil records.

See also ARCHEAN; LIFE’S ORIGINS AND EARLY EVOLUTION.

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