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LifeLife
BacteriaBacteria
ArchaeaArchaea
EukaryotesEukaryotes
ChromalveolatesChromalveolates
StramenopilesStramenopiles
AlveolatesAlveolates
PlantsPlants
Green plantsgreen
Land plantsland
Vascular plantsvascular
Seed plantsseed
GymnospermsGymnosperms
ExcavatesExcavates
RhizariaRhizaria
UnikontsUnikonts
FungiFungi
OpisthokontsOpisthokonts
AnimalsAnimals
EumetazoansEumetazoans
BilateriansBilaterians
ProtostomesProtostomes
LophotrochozoansLophotrochozoans
EcdysozoansEcdysozoans
ArthropodsArthropods
DeuterostomesDeuterostomes
AmbulacrariansAmbulacrarians
ChordatesChordates
VertebratesVertebrates
Jawed vertebratesjawed
Bony vertebratesbony
SarcopterygiansSarcopterygians
TetrapodsTetrapods
AmniotesAmniotes
ReptilesReptiles
ArchosaursArchosaurs
Spirochetes
Chlamydiae
Actinobacteria
Cyanobacteria
Low-gc gram-positives
Proteobacteria
Crenarchaeotes
Euryarchaeotes
Haptophytes
Brown algae
Diatoms
Oomycetes
Dinoflagellates
Apicomplexans
Ciliates
Angiosperms
Conifers
Gnetophytes
Ginkgo
Cycads
Ferns
Horsetails
Whisk ferns
Club mosses
Mosses
Hornworts
Liverworts
Charophytes
Chlorophytes
Red algae
Glaucophytes
Kinetoplastids
Euglenids
Heteroloboseans
Parabasalids
Diplomonads
Foraminiferans
Cercozoans
Radiolarians
Amoebozoans
Basidiomycetes
Ascomycetes
Glomeromycetes
Zygomycetes
Chytrids
Choanoflagellates
Glass sponges
Demosponges
Calcareous sponges
Ctenophores
Cnidarians
Ectoprocts
Flatworms
Rotifers
Ribbon worms
Brachiopods
Phoronids
Annelids
Mollusks
Arrow worms
Priapulids
Kinorhynchs
Loriciferans
Roundworms
Horsehair worms
Onychophorans
Tardigrades
Chelicerates
Myriapods
Crustaceans
Hexapods
Echinoderms
Hemichordates
Urochordates
Cephalochordates
Hagfishes
Lampreys
Chondrichthyans
Ray-finned fishes
Coelacanths
Lungfishes
Amphibians
Mammals
Turtles
Lepidosaurs
Birds
Crocodilians
AlgaeAlgae
ProkaryotesProkaryotes
ProtistsProtists
ProtozoansProtozoans
Archaea -- archaeans -- Unicellular organisms lacking a nucleus and lacking peptidoglycan in the cell wall. Once grouped with the bacteria, archaeans possess distinctive membrane lipids.

Updated: 2010-02-09 14:48:58 gmt
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