Euarchontoglires

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Euarchontoglires
Temporal range: Paleocene - Holocene, 65–0 Ma
Ring tail lemur leaping.JPG
Ring-tailed lemur (Lemur catta)
Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Clade: Synapsida
Class: Mammalia
Magnorder: Boreoeutheria
Superorder: Euarchontoglires
Murphy et al., 2001
Orders

Euarchontoglires (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, colugos and primates.

Evolutionary relationships[edit]

The Euarchontoglires clade is based on DNA sequence analyses and retrotransposon markers that combine the clades Glires (Rodentia + Lagomorpha) and Euarchonta (Scandentia + Primates + Dermoptera).[citation needed] So far, few if any anatomical features that support Euarchontoglires have been recognized, nor does any strong evidence from anatomy support alternative hypotheses.

Euarchontoglires is now recognized as one of the four major subclades within the clade Eutheria (i.e., placentalia (placental mammals),[1] and it is usually discussed without a taxonomic rank but has been regarded as a cohort, magnorder, or superorder. Relations among the four cohorts (Euarchontoglires, Xenarthra, Laurasiatheria, Afrotheria) and the identity of the placental root, remain controversial.[2]

Euarchontoglires probably split from the Laurasiatheria sister group about 85 to 95 million years ago, during the Cretaceous, and developed in the Laurasian island group that would later become Europe. This hypothesis is supported by molecular evidence; so far, the earliest known fossils date to the early Paleocene.[3] The clade of Euarchontoglires and Laurasiatheria is recognized as Boreoeutheria.[citation needed] Both Euarchontoglires and diprotodont marsupials are documented to possess a vermiform appendix, although this evolved as a result of convergent evolution.[4]

Organization[edit]

The hypothesized relationship among the Euarchontoglires is as follows:

Euarchontoglires
Gliriformes

Anagaloidea?



Arctostylopida[5]


Glires

Rodentia (rodents)



Lagomorpha (rabbits, hares, pikas)




Euarchonta

Scandentia (treeshrews)


Primatomorpha

Dermoptera (colugos)




Primates



Plesiadapiformes






One study based on DNA analysis suggests that Scandentia and Primates are sister clades, but did not discuss the position of Dermoptera.[6]

References[edit]

  1. ^ 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. 
  2. ^ 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. 
  3. ^ 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. PMID 23393258. 
  4. ^ 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. 
  5. ^ 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. PMID 16865388. 
  6. ^ Song S, Liu L, Edwards SV, Wu S (2012) Resolving conflict in eutherian mammal phylogeny using phylogenomics and the multispecies coalescent model. Proc Natl Acad Sci USA

Further reading[edit]