Offbeat: Meet Lori, a tiny dinosaur that may help explain how birds evolved flight - PressFrom - Canada
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OffbeatMeet Lori, a tiny dinosaur that may help explain how birds evolved flight

06:45  11 july  2019
06:45  11 july  2019 Source:   nationalgeographic.com

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Meet Lori, a tiny dinosaur that may help explain how birds evolved flight © Illustration by Gabriel Ugueto

A pair of Hesperornithoides miessleriis hunt along the forest floor in what is now Wyoming in an illustration. The newly described species is a relative of Velociraptor and may offer new clues to how birds evolved to fly.

A fluffy, three-foot-long killer found in Wyoming is the oldest known relative of Velociraptor discovered in North America, paleontologists announced today. Named Hesperornithoides miessleri, the ancient animal is also the smallest dinosaur yet found in the state, which until now has been known for fossils of celebrity behemoths such as Brachiosaurus, Diplodocus, and Stegosaurus.

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actually evolved from a type of dinosaur called a theropod. Theropods were meat-eating dinosaurs that shared many features with modern birds . Facts about flying animals. The largest known flying animal • Some scientists are not sure was Quetzacoatlus, a member if the Archaeopteryx, the

Early birds may have used their wings not for flying, but for running. Scientific American writer Kate Wong's report from that meeting , which originally ran in the January 2002 issue of the magazine, appears below. Traditionally, scholars have advanced two theories for how bird flight evolved .

The newly described dinosaur, reported today in the journal PeerJ, specifically comes from a layer of roughly 150-million-year-old rocks called the Morrison Formation, which covers a vast swath of the western U.S. centered on Wyoming and Colorado.

“When you’re working in the Morrison, you’re expecting to only find big stuff—even an isolated vertebra of Diplodocus is almost as big as this entire skeleton,” says study coauthor Dean Lomax, a paleontologist at the University of Manchester in the U.K. This diminutive fossil, he says, “demonstrates that the Morrison Formation was more diverse than previously known … and shows that there were little dinosaurs around.”

But the description of Hesperornithoidesmay ruffle some feathers among paleontologists, as the study authors argue that it hints the first flying ancestors of birds evolved among ground-dwelling dinosaurs, rather than tree-dwelling dinosaurs that could climb and glide.

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As birds evolved from these theropod dinosaurs , many of their features were modified. At right, asymmetrical flight feathers are present in a fossil of a dromaeosaurid that may have had the ability to glide. Another line of evidence comes from changes in the digits of the dinosaurs leading to birds .

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Fluffy little murderbird

Meet Lori, a tiny dinosaur that may help explain how birds evolved flight © Photograph by Levi Shinkle

These fossils belong to "Lori," now known to science as Hesperornithoides miessleri. The Jurassic animal is the smallest dinosaur yet found in the state of Wyoming.

Wyoming’s smallest known dinosaur was found by accident during a 2001 fossil dig to uncover the bones of its largest, a 111-foot-long sauropod called Supersaurus. A shovel went through Hesperornithoides’snout, unfortunately destroying part of it, as surface layers of soil were removed to reach the larger bones of Supersaurus.

Meet Lori, a tiny dinosaur that may help explain how birds evolved flight © Illustration by Scott Hartman

A skeletal reconstruction shows what Hesperornithoides miessleri would have looked like as it moved through what is now Wyoming. The scientists who described the fossil think it would have been covered in feathers, including long feathers on its forelimbs, effectively forming small wings.

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There are two theories about how feathered dinosaurs learned to fly, bottom up and top down. Why, and how , did the small theropod dinosaurs of the Jurassic and Cretaceous periods evolve feathers? It's a common mistake among those unversed in evolutionary theory to assume that feathers evolved

Scientists know that birds evolved from dinosaurs , and Archaeopteryx is part of that evolutionary path. This supported the idea of active flight for Archaeopteryx, meaning it could fly to escape predators or over short distances to reach new locations, as pheasants and roadrunners do.

When the dig crew first uncovered the fossil, they thought it might be a pterosaur, a flying reptilian contemporary of the dinosaurs, based on the minute size of the bones. It was only after careful preparation that they realized the find’s full significance.

The specimen is currently held in a public collection at the Wyoming Dinosaur Center in Thermopolis and has long been known among paleontologists as “Lori,” after volunteer Lori Hockemeyer, who was involved in the 2001 dig.

After initial preparation and analysis, Lori languished unstudied for many years. But Bill Wahl, preparation laboratory manager at the dinosaur center, showed Lomax the specimen in 2008, and he was enthralled by it.

Lomax didn’t forget about Lori, and in 2015 he brought together the team of researchers who would publish the description, using crowdfunding to get them and the specimen to the University of Wisconsin-Madison for a week of intense study in 2016.

The team found that Hesperornithoides was a type of dinosaur known as a troodontid, and it lived during the late Jurassic period. Its great age places it as a very early member of the wider group of dinosaurs that includes speedy, predatory dromaeosaurs such as Velociraptor, which lived in the Cretaceous period, about 75 million years ago.

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Meet Lori, a tiny dinosaur that may help explain how birds evolved flight © Photograph by Levi Shinkle

This detailed view shows the hunk of rock that contains the fossilized skull of Hesperornithoides miessleri.

Similar to that infamous Jurassic Park predator, Hesperornithoides had a large sickle-shaped claw on each foot, possibly useful for disemboweling prey. It also had many bird-like features, but was clearly terrestrial, seemingly supporting the idea that birds evolved on the ground from running dinosaurs, Lomax says.

The experts believe Hesperornithoides would have been covered with feathers, including long feathers on its forelimbs, effectively forming small wings. But the proportion of its limbs in relation to its body suggests that it was unable to fly. It likely lived in wetland and lakeside environments and hunted small animals including mammals, lizards, and other dinosaurs.

“It was a stereotypical raptor-like dinosaur. It would have behaved very much like a bird, and was about the size of a chicken with a long tail,” Lomax says.

Messy origin story

The tiny dinosaur “is an exceptionally rare find and the best of its kind in 150 years of fossil collecting in the Morrison,” says David Varricchio, a paleontologist at Montana State University in Bozeman who studies troodontid dinosaurs but was not involved in this research.

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Based on similar fossil finds in China, experts suspected that small, bird-like dinosaurs should be found in these rocks in the U.S. But more than a century of collecting “has produced very little in the way of specimens,” Varricchio says. “It’s amazing how little we know about them from this time in North America.”

Hesperornithoides is by far the region’s most complete small dinosaur fossil, with about 44 percent of its skeleton uncovered—others are only known from isolated teeth. This helped the study authors create a freshly detailed family tree of the dinosaurs most closely related to birds.

Based on their work, “most of the things we associate with birds—wings, feathers, etcetera—seem to evolve in a terrestrial context prior to the origin of bird flight,” says study leader Scott Hartman of the University of Wisconsin-Madison. He argues that likely tree-dwelling Chinese dinosaurs, which have been thought of as possible transitional steps in the evolution of bird flight, may be dinosaurs that evolved flight separately from the direct ancestors of birds.

“It’s a cool specimen for sure and adds to the very fragmentary number of [dinosaurs closely related to birds] known from this time,” says Jingmai O’Connor, a paleontologist at the Institute of Vertebrate Paleontology and Paleoanthropology in Beijing. “It’s pretty clear that flight evolved in dinosaurs more than once, and this new dataset supports that.”

However, she cautions that the findings related to bird origins are speculative, and that we shouldn’t read too much into them until we have more fossils to clarify relationships.

“We have more to learn before we can … discuss how and when flight and birds evolved,” Varricchio agrees. “I think it will probably be messy for a while.”

Follow John Pickrell on Twitter.

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