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Linnaean Taxonomy divides living things into five top-level groups, called kingdoms:

and then further into phylum, class, order, family, genus and species. One way to remember the ordering is "King Phillip Came Over For Great Spaghetti". This is based closely on the scheme established by Carolus Linnaeus, but over time has changed to reflect different considerations about the relationships of living things; with the advent of evolution, it is generally encouraged that groups be monophyletic?.

The five kingdom view has largely been supplanted by the three domain view in modern taxonomic work. This was precipitated by the discovery of the Archaea. In one version of the three domain view (that taken by the NCBI taxonomy http://www.ncbi.nlm.nih.gov/Taxonomy/taxonomyhome.html site), the following domains are the fundamental division with sub-divisions as indicated. Basically, what happens is that the old five kingdom stuff gets rearranged between Archaea, Prokaryotes and all Eukaryotes. Eukaryotes gets divided into many bits with the plants as we usually think of them going into one area, the algae going many different places, the fungi into a few places and animals getting put into a separate group with a few single celled items.

Crenarchaeota (extremely thermophilic archaebacteria)
Euryarchaeota
Korarchaeota
unclassified Archaea
Aquificales
CFB/Green? sulfur bacteria group
Chlamydiales/Verrucomicrobia? group
Chrysiogenes group
Coprothermobacter group
Cyanobacteria (blue-green algae)
Dictyoglomus group
Fibrobacter/Acidobacteria? group
Firmicutes (gram-positive bacteria)
Flexistipes group
Fusobacteria
Green non-sulfur bacteria
Nitrospira group
Nitrospira group
Proteobacteria
Spirochaetales
Synergistes group
Thermodesulfobacterium group
Thermotogales
Thermus/Deinococcus? group
unclassified Bacteria

Acanthamoebidae
Acantharea
Alveolata (alveolates)
Cercozoa
core jakobids
Cryptophyta (cryptomonads)
Diplomonadida (diplomonads)
Entamoebidae
Euglenozoa
Glaucocystophyceae
Granuloreticulosea
Haptophyceae
Heterolobosea
Malawimonadidae
Microsporidia
Mycetozoa
Opisthokonta (Animalia, Fungi, Choanoflagellates?)
Oxymonadida
Parabasalidea (parabasalids)
Paramyxea
Plasmodiophorida
Polycystinea
Ramicristates
Rhodophyta? (red algae)
Stramenopiles (heterokonts)
Viridiplantae] (green plants)
unclassified eukaryotes

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Last edited August 9, 2001 6:57 pm (diff)
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