Placentalia

Placental mammals (infraclass Placentalia ) are one of the three extant subdivisions of the class Mammalia, the other two being Monotremata and Marsupialia. Placentalia contains the vast majority of extant mammals, which are partly distinguished from monotremes and marsupials in that the fetus is carried in the uterus of its mother to a relatively late stage of development. The name is something of a misnomer, considering that marsupials also nourish their fetuses via a placenta, though for a relatively briefer period, giving birth to less-developed young, which are then nurtured for a period

The Archonta are a now-abandoned group of mammals, considered a superorder in some classifications, which consists of these orders: Primates Plesiadapiformes (extinct primate-like archontans) Scandentia (treeshrews) Dermoptera (colugos)