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Protozoa (n.)

"primordial or first-formed animals, cell-animals," 1828, from Modern Latin Protozoa, coined 1818 by German zoologist Georg August Goldfuss (1782-1848) from Greek prōtos "first" (see proto-) + zoia, plural of zoion "animal" (from PIE root *gwei- "to live"). Originally including sponges and corals; current sense is from 1845. Related: Protozoon (singular), also Protozoön; Protozoan.

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Definitions of Protozoa from WordNet

Protozoa (n.)
in some classifications considered a superphylum or a subkingdom; comprises flagellates; ciliates; sporozoans; amoebas; foraminifers;
Synonyms: phylum Protozoa
From wordnet.princeton.edu