Author: Ernst Haeckel (1834-1919) Dater: 1866 Description: The tree of life according to Haeckel, with the three branches Plantae, Protista, Animalia. The key point of Haeckels'work was that all beings, including man, had a monophyletic origin. Source: "Monophyletischer Stambaum der Organismen" from "Generelle Morphologie der Organismen : allgemeine Grundzüge der organischen Formen-Wissenschaft, mechanisch begründet durch die von C. Darwin reformirte Decendenz-Theorie", 1866, Berlin, through Wikimedia