Oldest Domain Biology

The first and oldest known domain is the archaea. These are ancient forms of bacteria that were originally grouped under the kingdom monera now defunct as archaeabacteria. The first two are all prokaryotic microorganisms or mostly single celled organisms whose cells have no nucleus.

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Archaea bacteria and eukarya.

Oldest domain biology. Eukaryotes evolved in the proterozoic eon. Before woese s discovery of archaea as distinct from bacteria in 1977 scientists believed there were only two types of life. The eukaryotes are often treated as a superkingdom or domain.

All life that has a cell nucleus and eukaryotic membrane bound organelles is included in eukar. The oldest grypania fossils come from an iron mine near negaunee michigan. According to this system the tree of life consists of three domains.

The three domain system developed by carl woese in 1990 is a system for classifying biological organisms. In biological taxonomy a domain also superkingdom realm or empire is the highest taxonomic rank of organisms in the three domain system of taxonomy devised by carl woese et al. The three domain system adds a level of classification the domains above the kingdoms present in the previously used five or six kingdom systems this classification system recognizes the fundamental divide between the two prokaryotic groups insofar as archaea appear to be more closely related to eukaryotes than they are to other prokaryotes bacteria like organisms with no cell nucleus.

The oldest known probable eukaryote is grypania a coiled unbranched filament up to 30mm long.