1. placental - Noun
2. placental - Adjective
Of or pertaining to the placenta; having, or characterized by having, a placenta; as, a placental mammal.
Of or pertaining to the Placentalia.
One of the Placentalia.
Source: Webster's dictionaryall mammals except monotremes and marsupials are placental mammals Source: Internet
Although marsupials and placental mammals did coexist in Australia in the Eocene, only marsupials have survived to the present. Source: Internet
Even today, marsupials in many cases have 40 to 50 teeth, which is significantly more in comparison to placental mammals. Source: Internet
Estimates for the divergence times between these three placental groups range from 105 to 120 million years ago, depending on type of DNA (such as nuclear or mitochondrial ) citation and varying interpretations of paleogeographic data. Source: Internet
Gradual senescence is exhibited by all placental mammalian life histories. Source: Internet
In the rare instances that they develop to postimplantation stages, gynogenetic embryos show better embryonic development relative to placental development, while for androgenones, the reverse is true. Source: Internet