Sentences with phrase «first placental mammals»
According to the new tree, the first placental mammals appeared around 65 million years ago, not 100 million years ago or more, as some molecular data have suggested.
http://www.sciencemag.org/
Among all mammals studied thus far, the orangutan's chromosomes are the most like those of the first placental mammal.
Not exact matches
It is the first time this sense has been reported in a marine mammal — or in any placental mammal.
A controversial theory that draws on geologic events and fossil evidence proposes that placental mammals may have originated in the southern landmasses and spread throughout the world as the first two continents — Laurasia and Gondwanaland — were breaking apart more than 100 million years ago.
«We discovered the existence of a short DNA sequence capable of activating a specific Hox gene, and which is present only in placental mammals and marsupials», explains Ruben Schep, the first author of the article.