Humongous prehistoric fleas fed on dinosaurs, couldn't jump

Scientists have found fossils of giant, ancient fleas in China. Their large size, five to ten times that of today's fleas, likely helped them to feed on dinosaurs. But they lacked the leg strength of today's fleas.

|
AP Photo/D. Huang, Nature
This undated handout photo provided by Nature shows female, left, and male, right, fleas from the Middle Jurassic. Scientists have recently discovered fossils of the world's oldest fleas.

The oldest fleas were five to 10 times larger than today's bloodsuckers, new research finds. But at least they couldn't jump.

These ancient bloodsuckers are the oldest fleas ever found, and the oldest example of bloodsucking parasites in the fossil record, study researcher André Nel of the Muséum National d’Histoire Naturelle in Paris told LiveScience.

These early fleas lacked the strong hindlegs of modern fleas, Nel said.

"Their biology and behavior was certainly different, more like that of a louse creeping among the fur and feathers of the hosts," said Nel, who, along with his colleagues, analyzed nine fossil specimens of the fleas discovered in outcrops in China.

The fleas lived in the Mesozoic era, a chunk of geologic time extending from 250 million years ago to 65 million years ago and includes the Jurassic period. They were giant compared with today's fleas, with one female specimen's body longer than 0.8 inches (2 cm), said study researcher Diying Huang, a researcher at the Chinese Academy of Science in Nanjing, China. Modern fleas don't get much larger than 0.1 inches, or 3 mm, in length. [Album: The Cutest Bugs]

The fleas' size and tough mouthparts would have made it easy for them to feast on large hosts — even dinosaurs.

"Their long siphonate dentate mouthparts may easily penetrate dinosaur skin," Huang told LiveScience.

The fossils, which reside in the collections of the Nanjing Institute of Geology and Palaeontology, fill in some of the gaps of flea evolution, Nel said. The first fleas evolved from ancestors that fed on plant fluids. Some then evolved from plants to animals, becoming bloodsuckers. These parasites lost their wings and developed grasping legs to cling to fur and feathers.

At some point still not pinpointed in the fossil record, Nel said, fleas evolved amazingly strong hind legs, which can catapult them 50 to 100 times their body length.

The Jurassic bloodsuckers are detailed Wednesday (Feb. 29) online in the journal Nature.

You can follow LiveScience senior writer Stephanie Pappas on Twitter @sipappas. Follow LiveScience for the latest in science news and discoveries on Twitter @livescience and on Facebook.

You've read  of  free articles. Subscribe to continue.
Real news can be honest, hopeful, credible, constructive.
What is the Monitor difference? Tackling the tough headlines – with humanity. Listening to sources – with respect. Seeing the story that others are missing by reporting what so often gets overlooked: the values that connect us. That’s Monitor reporting – news that changes how you see the world.

Dear Reader,

About a year ago, I happened upon this statement about the Monitor in the Harvard Business Review – under the charming heading of “do things that don’t interest you”:

“Many things that end up” being meaningful, writes social scientist Joseph Grenny, “have come from conference workshops, articles, or online videos that began as a chore and ended with an insight. My work in Kenya, for example, was heavily influenced by a Christian Science Monitor article I had forced myself to read 10 years earlier. Sometimes, we call things ‘boring’ simply because they lie outside the box we are currently in.”

If you were to come up with a punchline to a joke about the Monitor, that would probably be it. We’re seen as being global, fair, insightful, and perhaps a bit too earnest. We’re the bran muffin of journalism.

But you know what? We change lives. And I’m going to argue that we change lives precisely because we force open that too-small box that most human beings think they live in.

The Monitor is a peculiar little publication that’s hard for the world to figure out. We’re run by a church, but we’re not only for church members and we’re not about converting people. We’re known as being fair even as the world becomes as polarized as at any time since the newspaper’s founding in 1908.

We have a mission beyond circulation, we want to bridge divides. We’re about kicking down the door of thought everywhere and saying, “You are bigger and more capable than you realize. And we can prove it.”

If you’re looking for bran muffin journalism, you can subscribe to the Monitor for $15. You’ll get the Monitor Weekly magazine, the Monitor Daily email, and unlimited access to CSMonitor.com.

QR Code to Humongous prehistoric fleas fed on dinosaurs, couldn't jump
Read this article in
https://www.csmonitor.com/Science/2012/0229/Humongous-prehistoric-fleas-fed-on-dinosaurs-couldn-t-jump
QR Code to Subscription page
Start your subscription today
https://www.csmonitor.com/subscribe