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Topic: Amoebozoa


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  Amoebozoa - Wikipedia, the free encyclopedia
The Amoebozoa are a major group of amoeboid protozoa, including the majority that move by means of internal cytoplasmic flow.
The Amoebozoa also include the slime moulds, multinucleate or multicellular forms that produce spores and are usually visible to the unaided eye.
However, revised trees by Cavalier-Smith and Chao in 1996 suggested that the remaining lobosans do form a monophyletic group, and that the archamoebae and Mycetozoa are closely related to it, although the percolozoans are not.
en.wikipedia.org /wiki/Amoebozoa   (801 words)

  
 Amoebozoa - Palaeos   (Site not responding. Last check: 2007-10-16)
The Amoebozoa also include the slime moulds, multinucleate or multicellular forms that produce spores and are usually visible to the unaided eye.
However, revised trees by Cavalier-Smith and Chao in 1996[1] suggested that the remaining lobosans do form a monophyletic group, and that the archamoebae and Mycetozoa are closely related to it, although the percolozoans are not.
Subsequently they emended the older phylum Amoebozoa to refer to this supergroup.[2] Studies based on other genes have provided strong support for the unity of this group.[3] Patterson treated most with the testate filose amoebae as the ramicristates[4], based on mitochondrial similarities, but the latter are now removed to the Cercozoa.
www.palaeos.org /Lobosa   (1451 words)

  
 Amoebozoa - CreationWiki, the encyclopedia of creation science
The amoebozoa are one of the main groups of amoeboid protozoa, this is also counting the cells that move via internal cytoplasmic flow.
Most of the unicellular amoebozoa are usual in soil and aquatic environments.
These cysts grow to become amoebozoas and once that amoebozoa is about to die off it sends out new cysts to go and populate brand new areas of their environment.
creationwiki.org /Amoebozoa   (464 words)

  
 Amoebozoa - Biocrawler   (Site not responding. Last check: 2007-10-16)
The Amoebozoa are a major group of amoeboid protozoa, comprising the majority of the amoebae that move using blunt or lobose pseudopods.
However, revised trees by Cavalier-Smith and Chao in 1996 suggested that the remaining lobosans do form a monophyletic group, and that the archamoebae and Mycetozoa are closely related to it, although the percolozoans are not.
Subsequently they emended the older phylum Amoebozoa to refer to this supergroup.
www.biocrawler.com /encyclopedia/Amoebozoa   (754 words)

  
 Phylogeny of Lobose Amoebae Based on Actin and Small-Subunit Ribosomal RNA Genes -- Fahrni et al. 20 (11): 1881 -- ...
Phylogenetic position of lobose amoebae and relationships among Amoebozoa, as inferred from actin (A) and SSU rRNA (B) sequences.
Because the position of the root of the eukaryotic tree is subject to debate, both trees are presented in an unrooted format, with a basal trifurcation.
at the exclusion of Amoebozoa (e.g., Baldauf and Palmer 1993).
mbe.oxfordjournals.org /cgi/content/full/20/11/1881   (3608 words)

  
 Directory of open access journals
The Amoebozoa are a sister clade to the fungi and the animals, but are poorly sampled for completely sequenced genomes.
The social amoeba Dictyostelium discoideum and amitochondriate pathogen Entamoeba histolytica are the first Amoebozoa with genomes completely sequenced.
An expanded phylogenetic tree built from the complete predicted proteomes of 23 eukaryotes places the two amoebae in the same lineage, although the divergence is estimated to be greater than that between animals and fungi, and probably happened shortly after the Amoebozoa split from the opisthokont lineage.
www.doaj.org /doaj?func=abstract&id=127562&recNo=5&toc=1   (231 words)

  
 The genome of the social amoeba Dictyostelium discoideum : Nature   (Site not responding. Last check: 2007-10-16)
The amoebozoa are a richly diverse group of organisms whose genomes remain largely unexplored.
The amoebozoa are also noteworthy as representing one of the earliest branches from the last common ancestor of all eukaryotes.
The phylogenetic tree was reconstructed from a database of 5,279 orthologous protein clusters drawn from the proteomes of the 17 eukaryotes shown, and was rooted on 159 protein clusters that had representatives from six archaebacterial proteomes.
www.nature.com /nature/journal/v435/n7038/full/nature03481.html   (10410 words)

  
 AMOEBOZOA   (Site not responding. Last check: 2007-10-16)
Various others The Amoebozoa are a major group of amoeboid protozoa, comprising the majority of the amoebae that move using blunt or lobose pseudopods.
However, revised trees by Cavalier-Smith and Chao in 1996 suggested that the remaining lobosans form a monophyletic group, and that the archamoebae and Mycetozoa are closely related to it, although the heteroloboseans are not.
It is licensed under the GNU free documentation license.
www.yotor.org /wiki/en/am/Amoebozoa.htm   (748 words)

  
 Amoeboid - Indopedia, the Indological knowledgebase
The vast majority form a monophyletic group called the Amoebozoa, which also includes most slime moulds.
However, since they are all based on form rather than phylogeny, newer systems generally separate some out or abandon them entirely.
Most amoeboids are now included in two major supergroups - the Amoebozoa, including most lobose amoebae and slime moulds, and the Rhizaria, including the Cercozoa, Foraminifera, radiolarian classes and certain heliozoa.
www.indopedia.org /Amoeboid.html   (594 words)

  
 The Molecular History of Eukaryotic Life
With most of the Dictyostelium genome sequenced, there is a good chance a key synapomorphy could be found that unites this clade with the animal fungal clade and excludes plants and protists.
The fact that there are Amoebozoa (and fungi and animals, not shown) actin sequences without the insert suggests it is specific to ARP3.
Perhaps the Entamoeba sequence does belong with the Alveolates and not with the Amoebozoa, though the text of that paper claims this is an artefact.
drnelson.utmem.edu /MHEL.synaps.html   (2014 words)

  
 Palaeos Eukarya: Stem Metazoa: Apusomonadida   (Site not responding. Last check: 2007-10-16)
There is no significant evidence that the "Apusozoa" are a clade, although they may represent successive surviving branches from the trunk of the eukaryote tree.
We may then suppose, for example, that the ancestral form was a monad with a with a theca which, in some progeny, assumed the form found in the Apusozoa.
In the apusomonad lineage, the theca opened up ventrally to allow the formation of pseudopodia which, in turn, led to the abandonment of the theca in the Amoebozoa.
www.palaeos.com /Eukarya/Units/Apusomonadida/040.000.html   (816 words)

  
 Phylogenetic position of Multicilia marina and the evolution of Amoebozoa -- Nikolaev et al. 56 (6): 1449 -- ...
Phylogenetic position of Multicilia marina and the evolution of Amoebozoa -- Nikolaev et al.
Phylogenetic position of Multicilia marina and the evolution of Amoebozoa
of the phylum Amoebozoa, uniting naked and testate lobose amoebae,
ijs.sgmjournals.org /cgi/content/abstract/56/6/1449   (404 words)

  
 Slime mould - Indopedia, the Indological knowledgebase
It now appears that they gave rise to both the myxogastrids and dictyostelids, although they were considered unrelated based on rRNA.
Comparison of protein genes support a close relationship between the three groups and place them among the Amoebozoa.
Dictyostelids are used as examples of cellular communication and differentiation, and may provide insights into how multicellular organisms develop.
www.indopedia.org /Slime_mould.html   (455 words)

  
 Poster Contributions to the spring 2002 BSSP conference held at Bristol University.   (Site not responding. Last check: 2007-10-16)
We were able to amplify the TS gene alone from Choanozoa and Amoebozoa; thus it is probable (but not yet certain) that they have separate genes like animals and fungi.
As opisthokonts (Choanozoa, animals, fungi) are definitely derived, Amoebozoa are the only possible early diverging eukaryote lineage.
Ciliary evolution suggests that even they may not be truly early diverging and that the root may lie between opisthokonts and all other eukaryotes (bikonts plus Amoebozoa).
www.bsspweb.freeserve.co.uk /bsspsite2/posters02k.htm   (4400 words)

  
 The world's top amoebozoa websites   (Site not responding. Last check: 2007-10-16)
The Amoebozoa are a group of protists, comprising the majority of the lobose amoeboids and slime molds.
However, genetic studies include the amitochondriate pelobionts and entamoebae and remove the testate lobose amoeboids to the Cercozoa.
In the phylogeny proposed by Stechmann and Cavalier-Smith, the Amoebozoa lie near or at the base of the eukaryotes, but this position has also been assigned to the excavates.
dirs.org /dir-wiki.cfm?cat=amoebozoa&tab=edit   (373 words)

  
 [No title]
The signal transduction mechanisms present in Dictyostelium should be present in animals and fungi, but not necessarily in plants.
Knockout of the alpha subunit in rice causes a dwarf phenotype and abnormal seeds (Plant Phisiol.
These GPCR proteins are then found in four main branches at the top of the eukaryote tree, animals, fungi, amoebozoa and plants.
drnelson.utmem.edu /signaltrans.evol.html   (4321 words)

  
 SYSTEMATIC BIOLOGY
The Animal Kingdom (metazoans and choanoflagellates) are sister groups with the fungi (Bauldauf and Palmer, 1993) and form a group called the Opisthokonts (Cavalier-Smith and Chao 1995; Cavalier-Smith 1996; and Patterson, 1999).
This relationship has also been confirmed by supergroup analyses (Baldauf, 2003 and Keeling, 2004) which suggest a sister group relationship between the Opisthokonts and the Amoebozoa forming a larger group called the Unikonta.
See Major Clades of the Animal Kingdom for a summary of the relationships.
comenius.susqu.edu /bi/202/Animals   (970 words)

  
 UNIKONTAE
Some are motile, or can produce motile gametes or swarmer cells.
Even though these characters are not exclusive to the Amoebozoae, they do emerge as a monophyletic group in supertree analyses (Baldauf, 2003; Keeling, 2004; Nikolaev et al., 2004).
A more complete taxonomy (to the ordinal level) of the Kingdom Amoebozoae.
comenius.susqu.edu /bi/202/AMOEBOZOAE/AMOEBOZOAE.htm   (219 words)

  
 CarlZimmer.com
I once attended a conference about systematics -- the classification of species -- and felt as if I were looking at Mount Rushmore with a magnifying glass.
The names alone -- Tetraconata, Amoebozoa, Ecdysozoa, Oomycota, Neomeniomorpha -- were overwhelming.
Speaker after speaker hypothesized about how various species were related -- whether springtails or bristletails were the closest relatives of winged insects, whether sponges all descended from a common ancestor, whether slime molds are really molds.
www.carlzimmer.com /articles/2004/articles_2004_dawkins.html   (1244 words)

  
 CAVALIER-SMITH.ABS
Spliceosomal introns are currently known only in the more advanced subkingdom Neozoa.
Of these higher phyla, only two consist almost exclusively of flagellates (Dinozoa, which have a mix of zooflagellates and phytoflagellates, and the purely heterotrophic and largely zooflagellate Neomonada Cavalier-Smith, 1997), but two phyla with many amoebae (Amoebozoa, typically with lobose pseudopods, and Cercozoa Cavalier-Smith,.1997 with usually filose or reticulose pseudopods) also include some zooflagellates.
Mycetozoa and Archamoebae are grouped together as subphylum Conosa alongside the Lobosa within the Amoebozoa; though they usually diverge below the megakaryote radiation (i.e.
www.mbl.edu /CASSLS/CAVALIER-SMITH.ABS.html   (954 words)

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