Classification: Taxonomic ranks under review (cf. Illustrated Guide to Protozoa, 2000. Allen Press)
Protista (unicellular eukaryotes)
Sarcomastigophora (with pseudopodia and/or flagella)
Mastigophora (flagellates)
Zoomastigophora (zooflagellates, without chloroplasts)
Kinetoplastida (presence of extranuclear DNA, kinetoplast