Os exafroplacentalios (Exafroplacentalia, "ex afro" e "placentalia") são uma divisão dos Placentalia que incluiria os subgrupos Xenarthra e Boreoeutheria.
Acredita-se que há aproximadamente 105 milhões de anos houve a separação entre os Xenarthra e os Boreoeutheria.
William J. Murphy, Eduardo Eizirik, Mark S. Springer et al., Resolution of the Early Placental Mammal Radiation Using Bayesian Phylogenetics,Science, Vol 294, Issue 5550, 2348-2351 , 14 December 2001.
Kriegs, Jan Ole, Gennady Churakov, Martin Kiefmann, Ursula Jordan, Juergen Brosius, Juergen Schmitz. (2006) Retroposed Elements as Archives for the Evolutionary History of Placental Mammals. PLoS Biol 4(4): e91.[1] (pdf version)
Blanchette M, Green ED, Miller W, Haussler D. (2004) Reconstructing large regions of an ancestral mammalian genome in silico. Genome Res. 2004 Dec;14(12):2412-23. ([2])
Ma J, Zhang L, Suh BB, Raney BJ, Burhans RC, Kent WJ, Blanchette M, Haussler D, Miller W. (2006) Reconstructing contiguous regions of an ancestral genome. Genome Res. 2006 Dec;16(12):1557-65. Epub 2006 Sep 18. ([3])