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  • Newly-discovered mammal species survived dinosaur extinction – BBC News
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Newly-discovered mammal species survived dinosaur extinction – BBC News

Editor October 5, 2015

SCIENTISTS have discovered a species of ancient mammal that survived the event that led to the extinction of the dinosaurs.

The remains of this large, rodent-like creature give clues about how mammals “took over” when dinosaurs died out.

Kimbetopsalis simmonsae, as the newly-discovered species has been named, was a plant-eating creature that resembled a beaver.

Dr Stephen Brusatte from the University of Edinburgh, lead researcher on the study, explained how a student on his team called Carissa Raymond found the fossil while prospecting at a site in New Mexico, US.

“We realised pretty quickly that this was a totally new type of mammal that no-one has seen before,” he told BBC News.

The researchers noticed in particular the animal’s teeth, which were specialised for plant-chewing, with complicated rows of cusps at the back and incisors at the front for gnawing.

They named the species after Kimbeto Wash, the area in the New Mexico badlands where it was found.

“The other part of the name – psalis – means ‘cutting shears’ and is in reference to [the] blade-like teeth,” Dr Brusatte explained.

After the asteroid

This group of now-extinct mammals, collectively known as multituberculates, originated alongside the dinosaurs, during the Jurassic and thrived for more than 100 million years until they were apparently superseded by rodents.

“[During the Jurassic] these animals were all pretty small,” said Dr Brusatte.

“Then the asteroid hit, wiped out the dinosaurs and suddenly – in geological terms – this [group of animals] started to proliferate and get bigger.

“That’s how the rise of mammals started and really the end result of that is us being here today.”

The scientists say that this, and other mammal discoveries from that “brave new world”, paint a picture of how mammals made it through the extinction event.

“A whole lot of mammals did die, but this group is one that made it through pretty well,” Dr Brusatte explained.

“Literally, the world changed one day.

“That asteroid hit and suddenly the dinosaurs are wiped out. It looks like mammals were just waiting their turn and as soon as the dinosaurs disappeared, they thrived.” (Victoria GillScience reporter, BBC News)

Link: http://www.bbc.com/news/science-environment-34414923

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