Branching order of bacterial phyla (Woese, 1987)
There are several models of the Branching order of bacterial phyla, one of these was proposed in 1987 paper by Carl Woese. The branching order proposed by Carl Woese was based on molecular phylogeny, which was considered revolutionary as all preceding models were based on discussions of morphology. ("v." Monera). Several models have been proposed since and no consensus is reached at present as to the branching order of the major bacterial lineages. The gene used was the 16S ribosomal DNA. Tree. The names have been changed to reflect more current nomenclature used  by molecular phylogenists. Note on names. Despite the impact of the paper on bacterial classification, it was not a proposal for change of taxonomy. Consequently, many clades were given official names. Only subsequently, this occurred: for example, the "purple bacteria and relatives" were renamed Proteobacteria. Last universal common ancestor. The root of the tree, "i.e." the node of the last universal common ancestor, is placed between the domain "Bacteria" (or kingdom "Eubacteria" as it was then known) and the clade formed by the domains "Archaea" (formerly kingdom "Archaebacteria") and "Eukaryotes". This is consistent with all subsequent studies, bar the study  by Thomas Cavalier-Smith in 2002 and 2004, which was not based on molecular phylogeny. Eukaryotes are a mosaic of different lineages: Consequently, in Woese (1987) the group is referred to as urkaryote. The clade composed of Archaea and the nuclear genome of eukaryotes is called Neomura by T. Cavalier-Smith