Atlantogenata

Atlantogenata is a proposed cladeofplacental mammals containing the cohorts or superorders Xenarthra and Afrotheria.^[1] These groups originated and radiated in the South American and African continents, respectively, presumably in the Cretaceous. Together with Boreoeutheria, they make up Eutheria. The monophyly of this grouping is supported by some genetic evidence.^[2]^[3]

Atlantogenata Temporal range: Paleocene–Recent PreꞒ Ꞓ O S D C P T J K Pg N

Scientific classification
Domain:	Eukaryota
Kingdom:	Animalia
Phylum:	Chordata
Class:	Mammalia
Infraclass:	Placentalia
Clade:	Atlantogenata Waddell et al, 1999^[1]
Subgroups
Superorder Afrotheria: Clade Afroinsectiphilia Clade Paenungulata Superorder Xenarthra: Order Cingulata (Armadillos) Order Pilosa (Anteaters, sloths) Boreoeutheria?

Alternative hypotheses are that Boreoeutheria and Afrotheria combine to form Epitheria (as generally supported by anatomical and other physiological evidence) or that Boreoeutheria and Xenarthra combine to form ExafroplacentaliaorNotolegia.^[4]

Updated analysis of transposable element insertions around the time of divergence strongly supports the fourth hypothesis of a near-concomitant origin (trifurcation) of the three superorders of mammals: Afrotheria, Boreoeutheria, and Xenarthra.^[5]^[6]

^ ^a ^b Waddell, Peter J.; Cao, Ying; Hasegawa, Masami; Mindell, David P. (1999). "Assessing the Cretaceous Superordinal Divergence Times within Birds and Placental Mammals by Using Whole Mitochondrial Protein Sequences and an Extended Statistical Framework". Systematic Biology. 48 (1): 119–137. doi:10.1080/106351599260481. PMID 12078636.

^ Waddell, Peter J.; Okada, Norohiro; Hasegawa, Masami (1999). "Towards Resolving the Interordinal Relationships of Placental Mammals". Systematic Biology. 48 (1): 1–5. doi:10.1093/sysbio/48.1.1. PMID 12078634.

^ Murphy, W.J.; Pringle, T.H.; Crider, T.A.; Springer, M.S.; Miller, W. (2007). "Using genomic data to unravel the root of the placental mammal phylogeny". Genome Research. 17 (4): 413–421. doi:10.1101/gr.5918807. PMC 1832088. PMID 17322288.

^ Wildman, Derek E.; Chen, Caoyi; Erez, Offer; Grossman, Lawrence I.; Goodman, Morris; Romero, Roberto (2006). "Evolution of the mammalian placenta revealed by phylogenetic analysis". Proceedings of the National Academy of Sciences. 103 (9): 3203–3208. Bibcode:2006PNAS..103.3203W. doi:10.1073/pnas.0511344103. PMC 1413940. PMID 16492730.

^ Nishihara, H.; Maruyama, S.; Okada, N. (2009). "Retroposon analysis and recent geological data suggest near-simultaneous divergence of the three superorders of mammals". Proceedings of the National Academy of Sciences. 106 (13): 5235–40. Bibcode:2009PNAS..106.5235N. doi:10.1073/pnas.0809297106. PMC 2655268. PMID 19286970.

^ Churakov, G.; Kriegs, J. O.; Baertsch, R.; Zemann, A.; Brosius, J. R.; Schmitz, J. R. (2009). "Mosaic retroposon insertion patterns in placental mammals". Genome Research. 19 (5): 868–875. doi:10.1101/gr.090647.108. PMC 2675975. PMID 19261842.

References

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