Euarchontoglires
Temporal range: Paleocene–Present
From top to bottom (left): rat, treeshrew, colugo; (right) hare, macaque with human.
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Magnorder: Boreoeutheria
Superorder: Euarchontoglires
Murphy et al., 2001[1]
Subgroups

Euarchontoglires (from: Euarchonta ("true rulers") + Glires ("dormice")), synonymous with Supraprimates, is a clade and a superorder of mammals, the living members of which belong to one of the five following groups: rodents, lagomorphs, treeshrews, primates, and colugos.

Evolutionary affinities within mammals

Phylogenetic position of Euarchontoglires (in blue) among placentals in a genus-level molecular phylogeny of 116 extant mammals inferred from the gene tree information of 14,509 coding DNA sequences.[3] The other major clades are colored: marsupials (magenta), xenarthrans (orange), afrotherians (red), and laurasiatherians (green).

The Euarchontoglires clade is based on DNA sequence analyses and retrotransposon markers that combine the clades Glires (Rodentia + Lagomorpha) and Euarchonta (Scandentia + Primates + Dermoptera).[1] It is usually discussed without a taxonomic rank but has been called a cohort, magnorder, or superorder. Relations among the four cohorts (Euarchontoglires, Xenarthra, Laurasiatheria, Afrotheria) and the identity of the placental root remain controversial.[4][5]

So far, few, if any, distinctive anatomical features have been recognized that support Euarchontoglires; nor does any strong evidence from anatomy support alternative hypotheses.[citation needed] Although both Euarchontoglires and diprotodont marsupials are documented to possess a vermiform appendix, this feature evolved as a result of convergent evolution.[6]

Euarchontoglires probably split from the Boreoeutheria magnorder about 85 to 95 million years ago, during the Cretaceous, and developed in the Laurasian island group that would later become Europe.[citation needed] This hypothesis is supported by molecular evidence; so far, the earliest known fossils date to the early Paleocene.[7] The combined clade of Euarchontoglires and Laurasiatheria is recognized as Boreoeutheria.[citation needed]

Phylogenetic relationships within the clade

The hypothesized relationship among the Euarchontoglires is as follows:[8]

Boreoeutheria

One study based on DNA analysis suggests that Scandentia and Primates are sister clades, but does not discuss the position of Dermoptera.[9] Although it is known that Scandentia is one of the most basal Euarchontoglires clades, the exact phylogenetic position is not yet considered resolved, and it may be a sister of Glires, Primatomorpha or Dermoptera or to all other Euarchontoglires.[10][5][11] Some old studies place Scandentia as sister of the Glires, invalidating Euarchonta.[12][13]

Whole-genome duplication may have taken place in the ancestral Euarchontoglires.[14]

References

  1. ^ a b Murphy, William J.; Eizirik, Eduardo; O'Brien, Stephen J.; Madsen, Ole; Scally, Mark; Douady, Christophe J.; Teeling, Emma; Ryder, Oliver A.; Stanhope, Michael J.; de Jong, Wilfried W.; Springer, Mark S. (2001). "Resolution of the early placental mammal radiation using Bayesian phylogenetics". Science. 294 (5550): 2348–2351. doi:10.1126/science.1067179. PMID 11743200. S2CID 34367609.
  2. ^ Missiaen P, Smith T, Guo DY, Bloch JI, Gingerich PD (2006). "Asian gliriform origin for arctostylopid mammals". Naturwissenschaften. 93 (8): 407–411. doi:10.1007/s00114-006-0122-1. hdl:1854/LU-353125. PMID 16865388. S2CID 23315598.
  3. ^ Scornavacca C, Belkhir K, Lopez J, Dernat R, Delsuc F, Douzery EJ, Ranwez V (April 2019). "OrthoMaM v10: Scaling-up orthologous coding sequence and exon alignments with more than one hundred mammalian genomes". Molecular Biology and Evolution. 36 (4): 861–862. doi:10.1093/molbev/msz015. PMC 6445298. PMID 30698751.
  4. ^ Asher, RJ; Bennett, N; Lehmann, T (2009). "The new framework for understanding placental mammal evolution". BioEssays. 31 (8): 853–864. doi:10.1002/bies.200900053. PMID 19582725.
  5. ^ a b Kumar, Vikas; Hallström, Björn M.; Janke, Axel (2013-04-01). "Coalescent-Based Genome Analyses Resolve the Early Branches of the Euarchontoglires". PLOS ONE. 8 (4): e60019. doi:10.1371/journal.pone.0060019. ISSN 1932-6203. PMC 3613385. PMID 23560065.
  6. ^ Smith, H. F.; Fisher, R. E.; Everett, M. L.; Thomas, A. D.; Randal-Bollinger, R.; Parker, W. (October 2009). "Comparative anatomy and phylogenetic distribution of the mammalian cecal appendix". Journal of Evolutionary Biology. 22 (10): 1984–1999. doi:10.1111/j.1420-9101.2009.01809.x. PMID 19678866.
  7. ^ O'Leary, M. A.; Bloch, J. I.; Flynn, J. J.; Gaudin, T. J.; Giallombardo, A.; Giannini, N. P.; Cirranello, A. L. (2013). "The placental mammal ancestor and the post–K-Pg radiation of placentals". Science. 339 (6120): 662–667. doi:10.1126/science.1229237. hdl:11336/7302. PMID 23393258. S2CID 206544776.
  8. ^ Esselstyn, Jacob A.; Oliveros, Carl H.; Swanson, Mark T.; Faircloth, Brant C. (2017-08-26). "Investigating Difficult Nodes in the Placental Mammal Tree with Expanded Taxon Sampling and Thousands of Ultraconserved Elements". Genome Biology and Evolution. 9 (9): 2308–2321. doi:10.1093/gbe/evx168. PMC 5604124. PMID 28934378.
  9. ^ Song S, Liu L, Edwards SV, Wu S (2012). "Resolving conflict in eutherian mammal phylogeny using phylogenomics and the multispecies coalescent model". Proceedings of the National Academy of Sciences. 109 (37): 14942–7. doi:10.1073/pnas.1211733109. PMC 3443116. PMID 22930817.
  10. ^ Foley, Nicole M.; Springer, Mark S.; Teeling, Emma C. (2016-07-19). "Mammal madness: Is the mammal tree of life not yet resolved?". Philosophical Transactions of the Royal Society B. 371 (1699): 20150140. doi:10.1098/rstb.2015.0140. ISSN 0962-8436. PMC 4920340. PMID 27325836.
  11. ^ Zhou, Xuming; Sun, Fengming; Xu, Shixia; Yang, Guang; Li, Ming (2015-03-01). "The position of tree shrews in the mammalian tree: Comparing multi-gene analyses with phylogenomic results leaves monophyly of Euarchonta doubtful". Integrative Zoology. 10 (2): 186–198. doi:10.1111/1749-4877.12116. ISSN 1749-4877. PMID 25311886.
  12. ^ Meredith, Robert W.; Janečka, Jan E.; Gatesy, John; Ryder, Oliver A.; Fisher, Colleen A.; Teeling, Emma C.; Goodbla, Alisha; Eizirik, Eduardo; Simão, Taiz L. L. (2011-10-28). "Impacts of the Cretaceous terrestrial revolution and KPg extinction on mammal diversification". Science. 334 (6055): 521–524. doi:10.1126/science.1211028. ISSN 0036-8075. PMID 21940861. S2CID 38120449.
  13. ^ Zhou, Xuming; Sun, Fengming; Xu, Shixia; Yang, Guang; Li, Ming (2015-03-01). "The position of tree shrews in the mammalian tree: Comparing multi-gene analyses with phylogenomic results leaves monophyly of Euarchonta doubtful". Integrative Zoology. 10 (2): 186–198. doi:10.1111/1749-4877.12116. ISSN 1749-4877. PMID 25311886.
  14. ^ Dehal, Paramvir; Boore, Jeffrey L. (2005-09-06). "Two Rounds of Whole Genome Duplication in the Ancestral Vertebrate". PLOS Biology. 3 (10): e314. doi:10.1371/journal.pbio.0030314. ISSN 1545-7885. PMC 1197285. PMID 16128622.

Further reading

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