Early natural philosophers held that life on the earth is fundamentally dichotomous: all living things are either animals or plants. When microorganisms were discovered, they were di­vided in the same way. The large and motile ones were considered to be ani­mals and the ones that appeared not to move, including the bacteria, were con­sidered to be plants. As understanding of the microscopic world advanced it became apparent that a simple twofold classification would not suffice, and so additional categories were introduced: fungi, protozoa and bacteria. Ultimate­ly, however, a new simplification took hold. It seemed that life might be dichot­omous after all, but at a deeper level, namely in the structure of the living cell. All cells appeared to belong to one or the other of two groups: the eukaryotes, which are cells with a well-formed nucleus, and the prokaryotes, which do not have such a nucleus. Multicellular plants and animals are eukaryotic and so are many unicellular organisms. The only prokaryotes are the bacteria (in­cluding the cyanobacteria, which were formerly called blue-green algae).

In the past few years my colleagues and I have been led to propose a funda­mental revision of this picture. Among the bacteria we have found a group of organisms that do not seem to belong to either of the basic categories. The or­ganisms we have been studying are pro­karyotic in the sense that they do not have a nucleus, and indeed outwardly they look much like ordinary bacteria. In their biochemistry, however, and in the structure of certain large molecules, they are as different from other prokary­otes as they are from eukaryotes. Phylo­genetically they are neither prokaryotes nor eukaryotes. They make up a new "primary kingdom," with a completely different status in the history and the natural order of life.

We have named these organisms ar­chaebacteria. The name reflects an untested conjecture about their evolution­ary status. The phylogenetic evidence suggests that the archaebacteria are at least as old as the other major groups. Moreover, some of the archaebacteria have a form of metabolism that seems particularly well suited to the conditions believed to have prevailed in the early history of life on the earth. Hence it seems possible that the newest group of organisms is actually the oldest.