Protozoa Goldfuss, 1818 - protozoa Corticata Lankester, 1878 see Subkingdom Biciliata Excavata T. Cavalier-Smith, 2002 see Supergroup Excavata Cavalier-Smith, 2002 Archezoa Cavalier-Smith, 1983 see Infrakingdom Archezoa Cavalier-Smith, 1983 Metamonada Grassé, 1952 retortamonads see [unranked] Retortamonadida Grassé, 1952