Shipunov A.B. Systema Naturae [Electronic resource]. 1995 onwards. ... Pyramid of kingdoms , in SVG . ... Systema Naturae or the outline of living world classification // Protistology. ... The classification has: (1) small number of kingdoms; (2) large phyla; (3) incorporating as much as possible taxonomical data from different sources. ... The classification utilizes all described groups of living organisms, excluding fossils and viruses, from kingdoms and down to the level of class. ...