U.S. scientists have described a new extinct family of scorpionflies from fossils found in British Columbia and Washington state, most prominently at the McAbee Fossil Beds.

The new insect family has been named Eorpidae after the Eocene Epoch, the age when these insects lived some 50 million years ago. A study describing Eorpidae has been published in the Journal of Paleontology (full paper in .pdf).

“The Eorpidae was part of a cluster of six closely related families in the Eocene, but today this group is reduced to two. Why were these different? We believe the answer may lay in a combination of two large-scale challenges that would have hit them hard: the evolutionary diversification of a strong competitive group and global climate change,” said study first author Dr Bruce Archibald from Simon Fraser University.

In a major evolutionary diversification, ants evolved from a small group to become major ecological players in the Eocene, now competing with these scorpionflies for the same food resource in a whole new, efficient manner.

“Global climates were much warmer 50 million years ago, associated with increased atmospheric carbon, a relationship that scientists see today. Along with this, winters were mild, even in the cool, higher elevations where these insects lived. Average temperatures there were similar to modern Vancouver, but with few—if any—frost days.”

“When climates outside of the tropics later cooled, temperature seasonality also widened, forming the modern pattern of hot summers and freezing winters. Plant and animal groups that inhabited Eocene uplands either had to evolve tolerance for colder winters, migrate to the hot tropics and adapt to that climate, or go extinct.”

“These scorpionfly families appear to have retained their need to inhabit cooler climates, but to persist there, they would need to evolve toleration for cold winters, a feat that only the two surviving families may have accomplished,” Dr Archibald said.

“Understanding the evolutionary history of these insects adds another piece to the puzzle of how animal communities change as climate does – but in this case, when an interval of global warming ends.”

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Bibliographic information: Archibald SB et al. 213. The Eocene apex of panorpoid scorpionfly family diversity. Journal of Paleontology, 87 (4), pp. 677–695