Aug
06
2011

Dinosaurs of a feather get flocked together

Archaeopteryx (Thermopolis specimen): Has the iconic transitional fossil had its feathers ruffled by a recent discovery? Not really.
Archaeopteryx (Thermopolis specimen): Has the iconic transitional fossil had its feathers ruffled by a recent discovery? Not really.Courtesy Mark Ryan
China has been producing some remarkable and groundbreaking dinosaur fossils in recent years that have caused paleontologists to reconsider long-held views. A recently described feathered dinosaur is no different. Xiaotingia zhengi, discovered in the Jurassic shales of the Liaoning Province, has been in the news lately because it supposedly knocked the well-known, so-called proto-bird Archaeopteryx from its perch as the earliest bird.

The study by paleontologist Xu Xing and his colleagues from the Chinese Academy of Sciences in Beijing appears in Nature. Their research, it seems, has determined that Xiaotingia and Archaeopteryx share many features that make the two of them more bird-like dinosaurs than dinosaur-like birds. Do you see the difference there? I guess I do. Anyway, essentially what it means is that Archaeopteryx has been pushed back a little and is just a bit more distantly related to birds than previously thought. The classification places both Xiaotingia and Archaeopteryx in with avian-like carnivorous dinosaurs such as deinonychosaurs, dromaeosaurids, and troodontids. The recent spate of fossils coming out of China can’t help but alter some our old views of the middle to late Jurassic fauna. Many dinosaurs (including non-avian ones) living during that time were equipped with bird-like features: e. g. long arms, feathers, wishbones, etc. They were all over the place.

But all you diehards out there in the Archaeopteryx-is-a-bird camp need not despair just yet. Dr. Xu himself admits that some of the conclusions in the study are based on pretty weak evidence. Archaeopteryx continues to rank as an exceptional transitional fossil (along with Xiaotingia). Its place in the transition has just shifted slightly, that’s all. Further studies and new fossils will no-doubt shake up the branches of the avian family tree again.

References:
Story at Pharyngula
New York Times story

Your rating: None Average: 4.5 (4 votes)

Post new comment

The content of this field is kept private and will not be shown publicly.
  • Allowed HTML tags: <a> <h3> <h4> <em> <i> <strong> <b> <span> <ul> <ol> <li> <blockquote> <object> <embed> <param> <sub> <sup>
  • Lines and paragraphs break automatically.
  • You may embed videos from the following providers vimeo, youtube. Just add the video URL to your textarea in the place where you would like the video to appear, i.e. http://www.youtube.com/watch?v=pw0jmvdh.
  • Web page addresses and e-mail addresses turn into links automatically.
  • Images can be added to this post.

More information about formatting options