1) Class 2) Subclass eutheria 
Eutheria (ə; from Greek εὐ-, eu- `true/good` and θηρίον, thēríon `beast` hence `true beasts`) is one of two mammalian clades with extant members that diverged in the Early Cretaceous or perhaps the Late Jurassic. The other is the Metatheria, which includes marsupials, most of whom accommodate their neonates in pouches. Except for...
A subclass of mammals, excluding monotremes and marsupials, having a placenta through which the young are nourished. ... Origin: eu-+ G. Therion, animal ... (05 Mar 2000) ... 
Type: Term Pronunciation: yū-thē′rē-ă Definitions: 1. A subclass of mammals, excluding monotremes and marsupials, having a placenta through which the young are nourished.
The Eutheria are a subclass of higher mammals. The young are born as miniature adults after a prolonged period of gestation.
[n] - all mammals except monotremes and marsupials
subclass Eutheria noun all mammals except monotremes and marsupials