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Related to Placentalia: Eutheria


n. pl.1.(Zool.) A division of Mammalia including those that have a placenta, or all the orders above the marsupials.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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Zhelestids are dentally ungulate-like mammals, but were recently excluded from Placentalia (Wible et al., 2009) and are instead considered as herbivorous stem eutherians of Cretaceous Asian origin (Gheerbrant and Astibia, 1999; Archibald and Averianov, 2012).
It should be noted that the PLAC1 protein of the tree shrew, taken here to be the species most like the common ancestor of all Placentalia, is 211 amino acids long.