Insects that were killed off with the dinosaurs replaced via evolution within a million years

Vastet
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Insects that were killed off with the dinosaurs replaced via evolution within a million years

Leaf-mining insects destroyed with the dinosaurs, others quickly appeared

Date:
July 24, 2014

Source:
Penn State

Summary:
After the asteroid impact at the end of the Cretaceous period that triggered the dinosaurs' extinction and ushered in the Paleocene, leaf-mining insects in the western United States completely disappeared. Only a million years later, at Mexican Hat, in southeastern Montana, fossil leaves show diverse leaf-mining traces from new insects that were not present during the Cretaceous, according to paleontologists.

Exerpt:
"Our results indicate both that leaf-mining diversity at Mexican Hat is even higher than previously recognized, and equally importantly, that none of the Mexican Hat mines can be linked back to the local Cretaceous mining fauna," said Michael Donovan, graduate student in geosciences, Penn State.
Insects that eat leaves produce very specific types of damage. One type is from leaf miners -- insect larvae that live in the leaves and tunnel for food, leaving distinctive feeding paths and patterns of droppings.
Donovan, Peter Wilf, professor of geosciences, Penn State, and colleagues looked at 1,073 leaf fossils from Mexican Hat for mines. They compared these with more than 9,000 leaves from the end of the Cretaceous, 65 million years ago, from the Hell Creek Formation in southwestern North Dakota, and with more than 9,000 Paleocene leaves from the Fort Union Formation in North Dakota, Montana and Wyoming. The researchers present their results in today's (July 24) issue of PLOS ONE.

Full Article/Source:
http://www.sciencedaily.com/releases/2014/07/140724141602.htm


digitalbeachbum
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It could be they lived on in

It could be they lived on in some form or fashion.