Eutheria is a classification system nearly synonymous with Placentalia. Introduced by Thomas Henry Huxley in 1880, he meant for it to be more broad in definition than its precursor Placentalia. However, the noun placental is used almost universally to describe a placental mammal; placental mammals are rarely, if ever, referred to as eutheres. As a result, Placentalia remains the preferred choice for many scientists.
Mammals are vertebrate animals that are endothermic, have hair on their bodies, and produce milk to feed their babies.
Placentalmammals are the largest group, and their young develop inside the mother’s body while attached to a placenta.
There are more than 4,000 species of mammals, which taxonomists classify into different groups based on characteristics like their body structure, the number and type of bones, and the number and arrangement of teeth.
Placentalmammals differ from the marsupials in that their young develop to a relatively mature stage within a uterus attached to the mother by an allantoic placenta.
The lower teeth are borne on the dentary bone, the upper on the premaxilla and the maxilla.
Placentalmammals typically have two sets of teeth - the milk teeth are replaced by deciduous teeth as the animals mature.
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