Atlantogenata
Atlantogenata is a proposed clade of mammals containing the cohorts or superorders Xenarthra and Afrotheria. 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 was supported by some genetic evidence.
Alternative hypotheses are that Boreoeutheria and Afrotheria combine to form Epitheria or that Boreoeutheria and Xenarthra combine to form Exafroplacentalia or Notolegia.
Updated analysis of transposable element insertions around the time of divergence strongly supports the fourth hypothesis of a near-concomitant origin of the three superorders of mammals: Afrotheria, Boreoeutheria, and Xenarthra.
Below shows the phylogeny of the extant atlantogenate families.
