facebook
twitter
rss
account
search
search
 

Fossil fills gap in mammalian record

Nov. 2, 2011 at 5:56 PM   |   Comments

LOUISVILLE, Ky., Nov. 2 (UPI) -- U.S. researchers say a fossil found in South America fills a roughly 60 million-year gap in the known mammalian record of the continent.

Researchers from the University of Louisville in Kentucky say the fossil is of the first known mammal of the early Late Cretaceous period of South America.

The fossil creature, named "Cronopio dentiacutus" by paleontologists, is a dryolestoid, an extinct group of mammals distantly related to today's marsupials, a university release said Wednesday.

"Cronopio" was a tiny shrew-sized mammal about 4-6 inches in length with a diet of the insects, grubs and other bugs of the time, researchers said.

It lived when giant dinosaurs roamed Earth more than 100 million years ago.

The discovery is important because mammalian skulls are very fragile, small and rarely found, the researchers said.

"Most of what we know of early mammals has been determined through teeth because enamel is the hardest substance in our bodies and survives well the passage of time; it is usually what we have left to study," Louisville paleontologist Guillermy Rougier said.

"The skull, however, provides us with features of the biology of the animal, making it possible for us to determine this is the first of its kind dating to the early Late Cretaceous period in South America," he said.

"This time period in South America was somewhat of a blank slate to us. Now we have a mammal as a starting point for further study of the lineage of all mammals, humans included."

© 2011 United Press International, Inc. All Rights Reserved. Any reproduction, republication, redistribution and/or modification of any UPI content is expressly prohibited without UPI's prior written consent.
Most Popular
1
Massive sunspot sending violent flares toward Earth Massive sunspot sending violent flares toward Earth
2
Google exec breaks skydive record with dive from near-space Google exec breaks skydive record with dive from near-space
3
Powerful new microscope sees cell division in real time Powerful new microscope sees cell division in real time
4
Coal-rich Poland wants concessions in EU climate deal Coal-rich Poland wants concessions in EU climate deal
5
Stone tools reveal Ice Age settlement in the Andes Stone tools reveal Ice Age settlement in the Andes
Trending News
Around the Web
x
Feedback