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Statements

Subject Item
dbr:Protists_in_the_fossil_record
rdfs:label
Protists in the fossil record
rdfs:comment
A protist is any eukaryotic organism (that is, an organism whose cells contain a cell nucleus) that is not an animal, plant, or fungus. While it is likely that protists share a common ancestor, the last eukaryotic common ancestor, the exclusion of other eukaryotes means that protists do not form a natural group, or clade. Therefore, some protists may be more closely related to animals, plants, or fungi than they are to other protists. However, like algae, invertebrates and protozoans, the grouping is used for convenience.
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n12:Evolutionary_history_of_coccolithophores.jpg n12:Micro-CT_model_of_radiolarian,_Triplococcus_acanthicus.png n12:Tree_of_Living_Organisms_2.png n12:Protist_collage_2.jpg n12:Foraminifera_hg.jpg n12:Fusulinid_cutaway.gif n12:Paleodictyon_P.San_García_Algeciras_I03.jpg
dcterms:subject
dbc:Protista dbc:Evolution
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dbp:caption
This is a microfossil from the Middle Ordovician with four nested spheres. The innermost sphere is highlighted red. Each segment is shown at the same scale.
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dbp:header
Fossil radiolarian
dbp:headerAlign
center
dbp:image
Micro-CT model of radiolarian, Triplococcus acanthicus.png
dbp:width
500
dbo:abstract
A protist is any eukaryotic organism (that is, an organism whose cells contain a cell nucleus) that is not an animal, plant, or fungus. While it is likely that protists share a common ancestor, the last eukaryotic common ancestor, the exclusion of other eukaryotes means that protists do not form a natural group, or clade. Therefore, some protists may be more closely related to animals, plants, or fungi than they are to other protists. However, like algae, invertebrates and protozoans, the grouping is used for convenience. Many protists have neither hard parts nor resistant spores, and their fossils are extremely rare or unknown. Examples of such groups include the apicomplexans, most ciliates, some green algae (the Klebsormidiales), choanoflagellates, oomycetes, brown algae, yellow-green algae, Excavata (e.g., euglenids). Some of these have been found preserved in amber (fossilized tree resin) or under unusual conditions (e.g., Paleoleishmania, a kinetoplastid). Others are relatively common in the fossil record, as the diatoms, golden algae, haptophytes (coccoliths), silicoflagellates, tintinnids (ciliates), dinoflagellates, green algae, red algae, heliozoans, radiolarians, foraminiferans, ebriids and testate amoebae (euglyphids, arcellaceans). Some are used as paleoecological indicators to reconstruct ancient environments. More probable eukaryote fossils begin to appear at about 1.8 billion years ago, the acritarchs, spherical fossils of likely algal protists. Another possible representative of early fossil eukaryotes are the Gabonionta.
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