Kingdom Protozoa Goldfuss, 1818 - protozoa Subkingdom Neozoa Cavalier-Smith, 1993 see Kingdom Protozoa Goldfuss, 1818 1 Infrakingdom Sarcodina 2 Infrakingdom Alveolata Cavalier-Smith, 1991 see [unranked] Alveolata Cavalier-Smith, 1991 3 Infrakingdom Actinopoda Calkins, 1902 4 Infrakingdom Neomonada Cavalier-Smith, 1997