In 1987, Cavalier-Smith revised the six kingdom system to the Seven Kingdom system. According to that, the classification is divided into two Super Kingdoms (Prokaryota and Eukaryota) and seven kingdoms, two Prokaryotic Kingdoms (Eubacteria and Archaebacteria) and five Eukaryotic Kingdoms (Protozoa, Chromista, Fungi, Plantae, and Animalia).