list out all the order of subclass eutheria with 2examples each
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Eutheria contains several extinct genera as well as larger groups, many with complicated taxonomic histories still not fully understood. Members of the Adapisoriculidae, Cimolesta and Leptictida have been previously placed within the out-dated placental group Insectivora, while Zhelestids have been considered primitive ungulates. However, more recent studies have suggested these enigmatic taxa represent stem group eutherians, more basal to Placentalia.
The weakly favoured cladogram favours Boreoeuthearia as a basal eutherian clade as sister to the Atlantogenata.
The fossil eutherian species believed to be the oldest known is Juramaia sinensis, which lived about 160 million years ago.Montanalestes was found in North America, while all other nonplacental eutherian fossils have been found in Asia. The earliest-known placental fossils have also been found in Asia.
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Eutheria
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Further information: Evolution of mammals
Eutheria
Temporal range: Late Jurassic or Early Cretaceous–Holocene, 161 or 145–0 Ma
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