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Jump to: Eukaryotes & protists Eubacteria Archaea Fungi
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Eukaryota

Classification by
 

Cellular life
Archaebacteria
Eubacteria
Eukaryota
Eucarya
Eukarya
Eukaryote
Acantharea
Acritarchs
Alveolates
Apusomonads
Breviatea
Centroheliozoa
Cercomonadida
Chitinozoa
Chlorarachniophytes
Copromyxids
Cryptomonads
Desmothoracids
Dimorphids
Ebriids
Euglenozoa
Excavates
Fonticulids
Glaucocystophytes
Granuloreticulosa
Gymnophrea
Gymnosphaerids
Haplosporidia
Haptophytes
Hemimastigophora
Heterolobosea
Kathablepharids
Komokiacea
Mesomycetozoa
Nucleariids
Opisthokonts
Oxymonadida
Pansomonadida
Parabasalids
Paramyxea
Pelobionts and entamoebae
Phaeodarea
Plasmodiophorids
Polycystina
Ramicristates
Residua
Rhodophyta
Schizoclades
Spongomonads
Stephanopogonidae
Stramenopiles
Taxopodids
Telonemidae
Thaumatomonads
Vampyrellids
Viridaeplantae


Colpodella perforans
, from Heterotrophic flagellates of marine habitats


Amphidinium boggayum
, from Marine benthic dinoflagellates - NW Australia


Acantharea
, from Marine planktonic amoebae and other protists


Odontella rombus
, from Alfred Wegener Institute Phytoplankton
Description of Eukaryota:
The eukaryotes are one of the three major domains of cellular life. The eukaryotes are distinct because many cellular functions are sequestered into compartments that are separated from the cytoplasm by fluid lipo-protein membranes. The largest compartment in most cells is the nucleus - from which the group gets it name (karyon is greek for nut). The nucleus contains much of the cellular DNA, usually in multiple histone-rich chromosomes. Eukaryotes are rich in cytoskeletal proteins (e.g. the tubulin that forms microtubules or actin that forms microfilaments) and motility proteins (such as dynein, myosin, spasmin = caltractin = centrin). Cytoskeletal proteins provide shape to cells as well as anhcor and link cell components. Motility proteins help organelles move within the cells, facilitate cell and nuclear division, or move cells. Most eukaryotes contain mitochondria that derived from an ancient symbiosis with a bacterial lineage. Algae and plants contain chloroplasts derived from a symbiosis with a blue green algal lineage. Multicellularity (co-existence of functionally different cells with the same genome) has arisen many times within the estimated 2 billion year history of eukaryotes. The most familiar multicellular forms are the animals, plants and fungi. With almost 2,000,000 described species, eukaryotes are the most diverse of the cellular life forms. About one third of the species are equally distributed among fungi, plants and protists, the remaining two thirds are animals. Link to Eukaryotes in the Tree of Life project.


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  • micro*scope - version 6.0 - March, 2006
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