Placentalia

Placental mammals
Scientific classification
Kingdom: Animalia Phylum: Chordata Class: Mammalia Subclass: Theria Infraclass: Placentalia
Orders
Dermoptera (flying lemur) Primates Scandentia (tree shrew) Rodentia (redents) Lagomorpha (hare, rabbit, pika) Pholidota (pangolin) Chiroptera (bats) Insectivora (insectivores) Carnivora (carnivores) Artiodactyla (ungulates) Cetacea (whales) Perissodactyla (horse, tapir, rhinoceros) Tenrecidae[?] (Tenrecs) Chrysochloridae (Golden moles) Macroscelidea (elephant shrew) Tubulidentata (aardvark) Hyracoidea (hyrax, dassie) Proboscidea (elephant) Sirenia (sea cows) Xenarthra (edentata: anteater, sloth, armadillo)

Placentalia is the name of one of the principal groups of living mammals, and is often used in scientific classification as a subclass or an infraclass. The other two extant groups are the Monotremata and the Marsupalia. There are other groups of extinct mammals. The vast majority of living mammals are placental. The Placentalia are uniquely different from all other mammals in that the fetus is nourished during gestation via the placenta. The lineage is first known from the Lower Cretaceous of China, (Eomaia).