The Conosa group was first proposed by Thomas Cavalier-Smith in 1998 as a subphylum of Amoebozoa. Cavalier-Smith originally separated this group into two infraphyla: Archamoebae and Mycetozoa. Notable characteristics of these two groups are that Mycetozoa are free living, while Archamoebae are amitochondrial. This clade is morphologically defined by their complex microtubular skeleton that forms a partial or complete cone. They have a monolayer of microtubules that surround at least some of the anterior end of the cell and diverge into a cone shape towards the nucleus at the posterior end. This cone of microtubules usually starts at a single centriole and extends towards the nucleus. They also have a lateral microtubular ribbon towards the cell surface. Conosa can exist as aggregate aerobes with mitochondria and also as solitary anaerobes with no mitochondria or peroxisomes. There are mitochondriate and amitochondriate members, as well as free living and parasitic representatives. Mitochondria reduction could be a result of transitions to a parasitic lifestyle, as is seen in the amitochondral human parasite Entamoeba histolytica.
While morphological characteristics like pseudopodia and body shape, flagella, and cytoplasm properties have not been regarded as convincing taxonomic suggestions, emerging sequencing data is being used to support Conosa’s monophyly. A study using several hundred phylogenetic markers of 30 species found Conosa to be monophyletic as representatives of Mycetozoa, Entamoebidae, and Pelobionta grouped together using several amino acid sequencing analysis methods. The monophyly of Conosa and the Archamoebea infraphyla was also supported by cDNA sequencing of seventeen Amoebozoans. However, the monophyly of Conosa is not entirely supported. For example, another study using seven protein-coding genes did not find Conosa to be monophyletic due to members of Lobosa sharing a phylogenetic branch with the Conosan lineage Variosea. This same study did find all three Conosan lineages to be monophyletic.
Cavalier-Smith T (August 1998). "A revised six-kingdom system of life". Biol Rev Camb Philos Soc. 73 (3): 203–66. doi:10.1111/j.1469-185X.1998.tb00030.x. PMID 9809012. S2CID 6557779. Archived from the original on 2012-12-05. https://archive.today/20121205040851/http://www3.interscience.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=1464-7931&date=1998&volume=73&issue=3&spage=203
Bapteste E, Brinkmann H, Lee JA, et al. (February 2002). "The analysis of 100 genes supports the grouping of three highly divergent amoebae: Dictyostelium, Entamoeba, and Mastigamoeba". Proc. Natl. Acad. Sci. U.S.A. 99 (3): 1414–9. Bibcode:2002PNAS...99.1414B. doi:10.1073/pnas.032662799. PMC 122205. PMID 11830664. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC122205
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Song J, Xu Q, Olsen R, et al. (December 2005). "Comparing the Dictyostelium and Entamoeba genomes reveals an ancient split in the Conosa lineage". PLOS Comput. Biol. 1 (7): e71. Bibcode:2005PLSCB...1...71S. doi:10.1371/journal.pcbi.0010071. PMC 1314882. PMID 16362072. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1314882
Cavalier-Smith T (August 1998). "A revised six-kingdom system of life". Biol Rev Camb Philos Soc. 73 (3): 203–66. doi:10.1111/j.1469-185X.1998.tb00030.x. PMID 9809012. S2CID 6557779. Archived from the original on 2012-12-05. https://archive.today/20121205040851/http://www3.interscience.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=1464-7931&date=1998&volume=73&issue=3&spage=203
Cavalier-Smith, Thomas; Fiore-Donno, Anna Maria; Chao, Ema; Kudryavtsev, Alexander; Berney, Cédric; Snell, Elizabeth A.; Lewis, Rhodri (February 2015). "Multigene phylogeny resolves deep branching of Amoebozoa". Molecular Phylogenetics and Evolution. 83: 293–304. doi:10.1016/j.ympev.2014.08.011. https://doi.org/10.1016%2Fj.ympev.2014.08.011
Pánek, Tomáš; Zadrobílková, Eliška; Walker, Giselle; Brown, Matthew W.; Gentekaki, Eleni; Hroudová, Miluše; Kang, Seungho; Roger, Andrew J.; Tice, Alexander K.; Vlček, Čestmír; Čepička, Ivan (2016-05-01). "First multigene analysis of Archamoebae (Amoebozoa: Conosa) robustly reveals its phylogeny and shows that Entamoebidae represents a deep lineage of the group". Molecular Phylogenetics and Evolution. 98: 41–51. doi:10.1016/j.ympev.2016.01.011. ISSN 1055-7903. https://www.sciencedirect.com/science/article/pii/S1055790316000270
Bapteste E, Brinkmann H, Lee JA, et al. (February 2002). "The analysis of 100 genes supports the grouping of three highly divergent amoebae: Dictyostelium, Entamoeba, and Mastigamoeba". Proc. Natl. Acad. Sci. U.S.A. 99 (3): 1414–9. Bibcode:2002PNAS...99.1414B. doi:10.1073/pnas.032662799. PMC 122205. PMID 11830664. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC122205
Cavalier-Smith, Thomas; Fiore-Donno, Anna Maria; Chao, Ema; Kudryavtsev, Alexander; Berney, Cédric; Snell, Elizabeth A.; Lewis, Rhodri (February 2015). "Multigene phylogeny resolves deep branching of Amoebozoa". Molecular Phylogenetics and Evolution. 83: 293–304. doi:10.1016/j.ympev.2014.08.011. https://doi.org/10.1016%2Fj.ympev.2014.08.011
Cavalier-Smith T (August 1998). "A revised six-kingdom system of life". Biol Rev Camb Philos Soc. 73 (3): 203–66. doi:10.1111/j.1469-185X.1998.tb00030.x. PMID 9809012. S2CID 6557779. Archived from the original on 2012-12-05. https://archive.today/20121205040851/http://www3.interscience.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=1464-7931&date=1998&volume=73&issue=3&spage=203
Cavalier-Smith T (August 1998). "A revised six-kingdom system of life". Biol Rev Camb Philos Soc. 73 (3): 203–66. doi:10.1111/j.1469-185X.1998.tb00030.x. PMID 9809012. S2CID 6557779. Archived from the original on 2012-12-05. https://archive.today/20121205040851/http://www3.interscience.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=1464-7931&date=1998&volume=73&issue=3&spage=203
Song J, Xu Q, Olsen R, et al. (December 2005). "Comparing the Dictyostelium and Entamoeba genomes reveals an ancient split in the Conosa lineage". PLOS Comput. Biol. 1 (7): e71. Bibcode:2005PLSCB...1...71S. doi:10.1371/journal.pcbi.0010071. PMC 1314882. PMID 16362072. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1314882
Cavalier-Smith, Thomas; Fiore-Donno, Anna Maria; Chao, Ema; Kudryavtsev, Alexander; Berney, Cédric; Snell, Elizabeth A.; Lewis, Rhodri (February 2015). "Multigene phylogeny resolves deep branching of Amoebozoa". Molecular Phylogenetics and Evolution. 83: 293–304. doi:10.1016/j.ympev.2014.08.011. https://doi.org/10.1016%2Fj.ympev.2014.08.011
Pánek, Tomáš; Zadrobílková, Eliška; Walker, Giselle; Brown, Matthew W.; Gentekaki, Eleni; Hroudová, Miluše; Kang, Seungho; Roger, Andrew J.; Tice, Alexander K.; Vlček, Čestmír; Čepička, Ivan (2016-05-01). "First multigene analysis of Archamoebae (Amoebozoa: Conosa) robustly reveals its phylogeny and shows that Entamoebidae represents a deep lineage of the group". Molecular Phylogenetics and Evolution. 98: 41–51. doi:10.1016/j.ympev.2016.01.011. ISSN 1055-7903. https://www.sciencedirect.com/science/article/pii/S1055790316000270
Cavalier-Smith T (August 1998). "A revised six-kingdom system of life". Biol Rev Camb Philos Soc. 73 (3): 203–66. doi:10.1111/j.1469-185X.1998.tb00030.x. PMID 9809012. S2CID 6557779. Archived from the original on 2012-12-05. https://archive.today/20121205040851/http://www3.interscience.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=1464-7931&date=1998&volume=73&issue=3&spage=203
Pánek, Tomáš; Zadrobílková, Eliška; Walker, Giselle; Brown, Matthew W.; Gentekaki, Eleni; Hroudová, Miluše; Kang, Seungho; Roger, Andrew J.; Tice, Alexander K.; Vlček, Čestmír; Čepička, Ivan (2016-05-01). "First multigene analysis of Archamoebae (Amoebozoa: Conosa) robustly reveals its phylogeny and shows that Entamoebidae represents a deep lineage of the group". Molecular Phylogenetics and Evolution. 98: 41–51. doi:10.1016/j.ympev.2016.01.011. ISSN 1055-7903. https://www.sciencedirect.com/science/article/pii/S1055790316000270
Cavalier-Smith T (August 1998). "A revised six-kingdom system of life". Biol Rev Camb Philos Soc. 73 (3): 203–66. doi:10.1111/j.1469-185X.1998.tb00030.x. PMID 9809012. S2CID 6557779. Archived from the original on 2012-12-05. https://archive.today/20121205040851/http://www3.interscience.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=1464-7931&date=1998&volume=73&issue=3&spage=203
Cavalier-Smith T (August 1998). "A revised six-kingdom system of life". Biol Rev Camb Philos Soc. 73 (3): 203–66. doi:10.1111/j.1469-185X.1998.tb00030.x. PMID 9809012. S2CID 6557779. Archived from the original on 2012-12-05. https://archive.today/20121205040851/http://www3.interscience.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=1464-7931&date=1998&volume=73&issue=3&spage=203
Cavalier-Smith T (August 1998). "A revised six-kingdom system of life". Biol Rev Camb Philos Soc. 73 (3): 203–66. doi:10.1111/j.1469-185X.1998.tb00030.x. PMID 9809012. S2CID 6557779. Archived from the original on 2012-12-05. https://archive.today/20121205040851/http://www3.interscience.wiley.com/resolve/openurl?genre=article&sid=nlm:pubmed&issn=1464-7931&date=1998&volume=73&issue=3&spage=203
Bapteste E, Brinkmann H, Lee JA, et al. (February 2002). "The analysis of 100 genes supports the grouping of three highly divergent amoebae: Dictyostelium, Entamoeba, and Mastigamoeba". Proc. Natl. Acad. Sci. U.S.A. 99 (3): 1414–9. Bibcode:2002PNAS...99.1414B. doi:10.1073/pnas.032662799. PMC 122205. PMID 11830664. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC122205
Bapteste E, Brinkmann H, Lee JA, et al. (February 2002). "The analysis of 100 genes supports the grouping of three highly divergent amoebae: Dictyostelium, Entamoeba, and Mastigamoeba". Proc. Natl. Acad. Sci. U.S.A. 99 (3): 1414–9. Bibcode:2002PNAS...99.1414B. doi:10.1073/pnas.032662799. PMC 122205. PMID 11830664. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC122205
Song J, Xu Q, Olsen R, et al. (December 2005). "Comparing the Dictyostelium and Entamoeba genomes reveals an ancient split in the Conosa lineage". PLOS Comput. Biol. 1 (7): e71. Bibcode:2005PLSCB...1...71S. doi:10.1371/journal.pcbi.0010071. PMC 1314882. PMID 16362072. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1314882
Cavalier-Smith, Thomas; Fiore-Donno, Anna Maria; Chao, Ema; Kudryavtsev, Alexander; Berney, Cédric; Snell, Elizabeth A.; Lewis, Rhodri (February 2015). "Multigene phylogeny resolves deep branching of Amoebozoa". Molecular Phylogenetics and Evolution. 83: 293–304. doi:10.1016/j.ympev.2014.08.011. https://doi.org/10.1016%2Fj.ympev.2014.08.011
Cavalier-Smith, Thomas; Fiore-Donno, Anna Maria; Chao, Ema; Kudryavtsev, Alexander; Berney, Cédric; Snell, Elizabeth A.; Lewis, Rhodri (February 2015). "Multigene phylogeny resolves deep branching of Amoebozoa". Molecular Phylogenetics and Evolution. 83: 293–304. doi:10.1016/j.ympev.2014.08.011. https://doi.org/10.1016%2Fj.ympev.2014.08.011
Cavalier-Smith, Thomas; Fiore-Donno, Anna Maria; Chao, Ema; Kudryavtsev, Alexander; Berney, Cédric; Snell, Elizabeth A.; Lewis, Rhodri (February 2015). "Multigene phylogeny resolves deep branching of Amoebozoa". Molecular Phylogenetics and Evolution. 83: 293–304. doi:10.1016/j.ympev.2014.08.011. https://doi.org/10.1016%2Fj.ympev.2014.08.011
Bapteste E, Brinkmann H, Lee JA, et al. (February 2002). "The analysis of 100 genes supports the grouping of three highly divergent amoebae: Dictyostelium, Entamoeba, and Mastigamoeba". Proc. Natl. Acad. Sci. U.S.A. 99 (3): 1414–9. Bibcode:2002PNAS...99.1414B. doi:10.1073/pnas.032662799. PMC 122205. PMID 11830664. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC122205
Bapteste E, Brinkmann H, Lee JA, et al. (February 2002). "The analysis of 100 genes supports the grouping of three highly divergent amoebae: Dictyostelium, Entamoeba, and Mastigamoeba". Proc. Natl. Acad. Sci. U.S.A. 99 (3): 1414–9. Bibcode:2002PNAS...99.1414B. doi:10.1073/pnas.032662799. PMC 122205. PMID 11830664. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC122205
Cavalier-Smith, Thomas; Fiore-Donno, Anna Maria; Chao, Ema; Kudryavtsev, Alexander; Berney, Cédric; Snell, Elizabeth A.; Lewis, Rhodri (February 2015). "Multigene phylogeny resolves deep branching of Amoebozoa". Molecular Phylogenetics and Evolution. 83: 293–304. doi:10.1016/j.ympev.2014.08.011. https://doi.org/10.1016%2Fj.ympev.2014.08.011
Pánek, Tomáš; Zadrobílková, Eliška; Walker, Giselle; Brown, Matthew W.; Gentekaki, Eleni; Hroudová, Miluše; Kang, Seungho; Roger, Andrew J.; Tice, Alexander K.; Vlček, Čestmír; Čepička, Ivan (2016-05-01). "First multigene analysis of Archamoebae (Amoebozoa: Conosa) robustly reveals its phylogeny and shows that Entamoebidae represents a deep lineage of the group". Molecular Phylogenetics and Evolution. 98: 41–51. doi:10.1016/j.ympev.2016.01.011. ISSN 1055-7903. https://www.sciencedirect.com/science/article/pii/S1055790316000270
Pánek, Tomáš; Zadrobílková, Eliška; Walker, Giselle; Brown, Matthew W.; Gentekaki, Eleni; Hroudová, Miluše; Kang, Seungho; Roger, Andrew J.; Tice, Alexander K.; Vlček, Čestmír; Čepička, Ivan (2016-05-01). "First multigene analysis of Archamoebae (Amoebozoa: Conosa) robustly reveals its phylogeny and shows that Entamoebidae represents a deep lineage of the group". Molecular Phylogenetics and Evolution. 98: 41–51. doi:10.1016/j.ympev.2016.01.011. ISSN 1055-7903. https://www.sciencedirect.com/science/article/pii/S1055790316000270
Pánek, Tomáš; Zadrobílková, Eliška; Walker, Giselle; Brown, Matthew W.; Gentekaki, Eleni; Hroudová, Miluše; Kang, Seungho; Roger, Andrew J.; Tice, Alexander K.; Vlček, Čestmír; Čepička, Ivan (2016-05-01). "First multigene analysis of Archamoebae (Amoebozoa: Conosa) robustly reveals its phylogeny and shows that Entamoebidae represents a deep lineage of the group". Molecular Phylogenetics and Evolution. 98: 41–51. doi:10.1016/j.ympev.2016.01.011. ISSN 1055-7903. https://www.sciencedirect.com/science/article/pii/S1055790316000270
Bapteste E, Brinkmann H, Lee JA, et al. (February 2002). "The analysis of 100 genes supports the grouping of three highly divergent amoebae: Dictyostelium, Entamoeba, and Mastigamoeba". Proc. Natl. Acad. Sci. U.S.A. 99 (3): 1414–9. Bibcode:2002PNAS...99.1414B. doi:10.1073/pnas.032662799. PMC 122205. PMID 11830664. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC122205
Cavalier-Smith, Thomas; Fiore-Donno, Anna Maria; Chao, Ema; Kudryavtsev, Alexander; Berney, Cédric; Snell, Elizabeth A.; Lewis, Rhodri (February 2015). "Multigene phylogeny resolves deep branching of Amoebozoa". Molecular Phylogenetics and Evolution. 83: 293–304. doi:10.1016/j.ympev.2014.08.011. https://doi.org/10.1016%2Fj.ympev.2014.08.011
Pánek, Tomáš; Zadrobílková, Eliška; Walker, Giselle; Brown, Matthew W.; Gentekaki, Eleni; Hroudová, Miluše; Kang, Seungho; Roger, Andrew J.; Tice, Alexander K.; Vlček, Čestmír; Čepička, Ivan (2016-05-01). "First multigene analysis of Archamoebae (Amoebozoa: Conosa) robustly reveals its phylogeny and shows that Entamoebidae represents a deep lineage of the group". Molecular Phylogenetics and Evolution. 98: 41–51. doi:10.1016/j.ympev.2016.01.011. ISSN 1055-7903. https://www.sciencedirect.com/science/article/pii/S1055790316000270
Cavalier-Smith, Thomas; Fiore-Donno, Anna Maria; Chao, Ema; Kudryavtsev, Alexander; Berney, Cédric; Snell, Elizabeth A.; Lewis, Rhodri (February 2015). "Multigene phylogeny resolves deep branching of Amoebozoa". Molecular Phylogenetics and Evolution. 83: 293–304. doi:10.1016/j.ympev.2014.08.011. https://doi.org/10.1016%2Fj.ympev.2014.08.011
Song J, Xu Q, Olsen R, et al. (December 2005). "Comparing the Dictyostelium and Entamoeba genomes reveals an ancient split in the Conosa lineage". PLOS Comput. Biol. 1 (7): e71. Bibcode:2005PLSCB...1...71S. doi:10.1371/journal.pcbi.0010071. PMC 1314882. PMID 16362072. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1314882