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Proposed clade of placental mammals From Wikipedia, the free encyclopedia
Exafroplacentalia or Notolegia is a clade of placental mammals proposed in 2001 on the basis of molecular research.[1][2][3]
Exafroplacentalia | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Mammalia |
Infraclass: | Placentalia |
Clade: | Exafroplacentalia Waddell et al, 2001[1] |
Subgroups | |
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Exafroplacentalia places Xenarthra as a sister group to the Boreoeutheria (comprising Laurasiatheria and Euarchontoglires),[4] thus making Afrotheria a primitive group of placental mammals (the group name roughly means "those which are not African placentals").
Eutheria |
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However, this classification makes the autapomorphy (character shared only among Exafroplacentalia) dubious: it is hard to classify a group by the absence of a feature (in this case "not coming from Africa").[5] Hence, several alternative hypotheses can be considered.
One alternative hypothesis is the Epitheria hypothesis:
Another alternative hypothesis is the Atlantogenata hypothesis:
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:[5]
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