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Archive for the ‘inner ear’ Category

The ankylosaurid armored dinosaur Euoplocephalus (AMNH 5405). A new article confirms the highly tortuous "crazy-straw" nasal passage coiled up within the snout..

In 2008, Ryan Ridgely and I published an article on dinosaur sinuses and nasal cavities in the Anatomical Record. One of our findings was unexpected to the point of seeming almost dubious. We found that, despite what had been stated in the literature, including my own published statements, armored dinosaurs (the plant-eating, tank-like ankylosaurs) didn’t have extensive paranasal air sinuses, but instead, long tortuous nasal airways. We looked at several skulls of both the ankylosaurid Euoplocephalus and the nodosaurid Panoplosaurus (or Edmontonia…someone needs to sort that out). According to our CT-scan-based analyses, the nasal passages took a long, twisting, looping course through the snout from the nostril to the throat. No one had ever suspected such a thing, and so we wondered what the community would think of our crazy crazy-straw hypothesis. Science is all about repeatability: if a claim is true, independent workers should be able to replicate results using the same or similar data. So, it was with no small amount of excitement/fear/anxiety that we greeted the news that an independent group consisting of respected researchers from the University of Alberta (Tetsuto Miyashita, ankylosaur specialist Victoria Arbour, and Philip Currie) were testing our hypothesis based on not only our own data but also data from additional specimens. Having others check our work was the reason we had freely released our original data to the community in 2008. That said, “promoting scientific repeatability” is a much more noble concept in the abstract (gulp!). Today, the results appear in an article in the Journal of Anatomy. (more…)

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Hadrosaur multimedia exhibit at "Dinosaurs Unearthed" at the Dallas Museum of Nature & Science. Photo courtesy of Rissa Westerfield, Texas Tech University.

The WitmerLab has an ongoing collaboration on the duckbilled hadrosaur dinosaurs with David Evans of the Royal Ontario Museum in Toronto. Recently, we’ve received word that some of that work has found its way into the “Dinosaurs Unearthed” exhibit that has been circulating through the US. First, Ohio University grad student Haley O’Brien texted me a photo of the exhibit at Union Station in Kansas City, and then Texas Tech grad student Rissa Westerfield posted a photo on Facebook of the exhibit at the Museum of Nature & Science in Dallas. Then just yesterday, WitmerLab alum Casey Holliday (now at Missouri) chimed in with his own sighting in KC. Presumably, it’s elsewhere, too. We’re thrilled to hear that the outcome of our research is reaching a broad audience!

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The National Geographic Channel ran a documentary called “Bizarre Dinosaurs” way back in October 2009, but just yesterday I got a copy of the DVD, which has inspired this post. I appeared on the show in different contexts, but primarily talking about Nigersaurus, indeed a dinosaur to which the term “bizarre” applies.

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