Literally meaning: “first animals”
Origin: Anc Greek
ζώα/zoa(=plural of “ζώον”/zoon=a live thing, animal)
The term was coined in1818 by German biologist Georg August Goldfuss
(zoology): The single-cell eukaryotic organisms usually motile ( such as amoebas, ciliates, flagellates, and sporozoan) that consist an Animal Phylum. The term "protozoa" continues to be used traditionally as the organisms are now more commonly placed in any of five phyla in the kingdom Protista.