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archaea
The domain comprising what were formerly known as the archaebacteria. What used to be the kingdom Archaebacteria has been split into two kingdoms: Crenarchaeota and Euryarchaeota. The domain Archaea ...
Bacteria
One of three superkingdoms (domains) of cellular organisms, the others being Archaea and Eukarya. Bacteria are unicellular and anucleate i.e. prokaryotes. They embrace a great diversity of forms, ...
bacteria
Unicellular or threadlike micro-organisms that reproduce by fission (2) and are often parasitic and liable to cause diseases. bacterial adj. bacterium sing. [From Greek bakterion a little rod, ...
Crenarchaeota
The less derived (see apomorph) of the Archaea, consisting principally of extreme thermophiles and psychrophiles. Members of the Crenarchaeota show a greater genetic similarity to eukaryotes than to ...
domain
The highest taxonomic category in a classification system based on comparisons of ribosomal RNA. There are three domains: Archaea; Eubacteria; and Eukarya. Each domain comprises organisms that are ...
eocyte hypothesis
A proposed taxonomic revision that would replace the three-*domain classification with one of only two domains, Bacteria and Archaea, an idea first proposed in 1984 by James Lake and colleagues. ...
Eukarya
A domain containing all eukaryotic organisms, embracing protists, fungi, plants, and animals. In three-domain classification systems, the other two (prokaryotic) domains are Archaea (comprising the ...
Euryarchaeota
1 In the widely-used five-kingdom system for classifying organisms, a phylum within the subkingdom Archaea in the kingdom Bacteria.2 In the three-domain classification, the more derived (see ...
kingdom
The highest level of taxonomic classification. All organisms fall into one of three currently accepted kingdoms, each of which has unique and unifying characteristics: eukaryotes, prokaryotes, and ...
Monera
In some taxonomic schemes, one of the 5 kingdoms of life, comprising the prokaryotic Cyanophyta' (cyanobacteria) and ‘Schizomycophyta’ (other bacteria). Prokaryotes are currently placed into more ...
prokaryote
Any organism in which the genetic material is not enclosed in a cell nucleus. Prokaryotes consist exclusively of bacteria, i.e. archaebacteria and eubacteria, which are now generally classified in ...
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