Meet the 66M-Year-Old Ancestor of Mammals
Scientists come up with theoretical creature
By Mark Russell, Newser Staff
Posted Feb 8, 2013 3:40 PM CST
This 2012 artist’s rendering provided by the American Museum of Natural History shows a hypothetical placental mammal ancestor, a small, insect-eating animal.   (AP Photo/American Museum of Natural History, Carl Buell)

(Newser) – Say hello to your great-great-great-great-great-grandparents (times a few million or so)—Protungulatum donnae, a rat-sized insect eater believed to have lived 66 million years ago. A new six-year study of the mammalian family tree, looking at DNA and anatomical evidence in greater detail than ever before, has identified Protungulatum donnae as the most likely common ancestor for all 5,400 placental mammal species, reports the New York Times. The critter, however, is only hypothetical, notes the LA Times, explaining that scientists used data to "reverse-engineer" it.

The study examined 83 mammals and fossils for more than 4,500 traits, creating a database 10 times larger than any previous database. Because Protungulatum donnae would have emerged 200,000 to 400,000 years after the great extinction that ended the dinosaurs—about 36 million years later than previous estimates—scientists say this is a clear sign the rise of the mammals was tied to that mass extinction. The abstract to the original article is at Science magazine.

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Showing 3 of 218 comments
right2dave
Feb 12, 2013 11:12 PM CST
He does have Obama's eyes? These used to run wild when Brush Man was a tyke.
realtruth
Feb 11, 2013 7:31 AM CST
The critter, however, is only hypothetical, notes the LA Times, explaining that scientists used data to "reverse-engineer" it Does that not sound just like scientist of 2000 years ago trying to explain creation.. We don’t have any proof.. so all you followers must believe this story we have written in our scientific bible. If it look like a religion, smells like a religion.. acts like a religion… It may be a religion.
1freeusa
Feb 9, 2013 9:27 PM CST
it is a hypothetical creature! Just another theory to go along with all the others until we learn more and can base our new theories on information we used to make our previous theories.