kingdom protoctista,
protoctista in most modern classifications, replacement for the Protista; includes: Protozoa; Euglenophyta; Chlorophyta; Cryptophyta; Heterokontophyta; Rhodophyta; unicellular protists and their descendant multicellular organisms: regarded as distinct from plants and animals
protozoan,
protozoon any of diverse minute acellular or unicellular organisms usually nonphotosynthetic
