- Dinosaur

I Know Dino Podcast Present Notes: Irritator (Episode 96)


Episode 96 is all about Irritator, a spinosaurid theropod whose identify comes “from irritation, the sensation the authors felt (understated right here) when discovering that the snout had been artificially elongated.”

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On this episode, we focus on:

  • The dinosaur of the day: Irritator
  • Irritaor is a spinosaurid theropod that lived within the Early Cretaceous in what’s now Brazil
  • Described in 1996 by Martill, Cruikskank, Frey, Small, and Clarke
  • A brand new crested maniraptoran dinosaur from the Santana Formation (Decrease Cretaceous) of Brazil, printed in 1996
  • Extra absolutely described in Irritator challengeri, a Spinosaurid (Dinosauria: Theropoda) from the Decrease Cretaceous of Brazil, printed in 2002
  • Just one fossil discovered, of an 32 in (80 cm) lengthy cranium
  • Practically full cranium
  • Not properly preserved, there was plaster that obscured the fossil (added by fossil poachers who illegally bought the fossil to make the fossil look extra full)
  • The consumers didn’t understand the quantity of labor required to revive the fossil once they purchased it, and they also named it Irritator
  • The authors wrote the identify got here “from irritation, the sensation the authors felt (understated right here) when discovering that the snout had been artificially elongated”
  • Kind species is Irritator challengeri, and the species identify is in honor of Professor Challenger, a personality in Arthur Conan Doyle’s The Misplaced World (story about an expedition to the Amazon Basin the place the characters discover dinosaurs)
  • Unknown the place precisely the fossil was discovered (because it was bought illegally), however in all probability got here from the Romualdo Member of the Santana Formation, primarily based on the kind of rock
  • This space is about 110 million years outdated, and got here from a time when Africa and South America had been nonetheless linked within the north of Brazil
  • Most likely ate fish
  • Could have eaten different animals (no matter it might catch). There’s a pterosaur discovered with a tooth, in all probability from Irritator, in its neck, so could have eaten pterosaurs
  • Had skinny enamel, good for catching slippery prey
  • Continuously changed enamel
  • Cranium appears so much like Suchomimus and Spinosaurus (crocodile-like head)
  • Had nostrils in the back of its cranium (crocodile-like head)
  • Thought to have a Sagittal crest, a bony ridge on the highest of the cranium that’s hooked up to the jaw muscular tissues
  • Sagittal crest means it in all probability had sturdy neck muscular tissues, so might shut its jaws shortly even in water, however that doesn’t imply it specialised in consuming fish
  • Typically thought-about to be synonymous with Angaturama, which lived on the identical time and place. Additionally the fossils discovered on Angaturama appear to finish the Irritator fossil, so that they might be the identical specimen
  • Angaturama was described in 1996, after Irritator, primarily based on a fossil discovered within the Santana formation. Later 60% of the skeleton was discovered, so a reproduction was made and placed on show on the Rio de Janiero Nationwide Museum. A number of paleontologists suppose Irritator and Angaturama are completely different, primarily based on Angaturama having a better, extra flattened head
  • Diane Scott absolutely cleaned the cranium, and a brand new paper was printed in 2002 to additional describe Irritator
  • Had a slender cranium with an elongated snout (again of the cranium was deeper than initially thought)
  • Enamel just like Spinosaurus aegyptiacus, however onerous to check different components due to lack of fossils
  • Additionally discovered it didn’t have a crest
  • In 2004 components of a spinal column of a spinosaurid had been discovered within the Santana Formation, and they’re thought to belong to Irritator
  • It was estimated to be about 26 ft (8 m) lengthy, although Gregory Paul stated in 2010 it might solely have been 7.5 m lengthy
  • Could have had a sail, however that’s a guess since no fossil has been discovered
  • Enjoyable truth: Though it’s unlawful to export fossils from China, the Psittacosaurus, “SMF R 4970”, was taken out of China and bought on the black market just a few instances earlier than being purchased by the Senckenberg museum in Germany. So if you happen to dwell close by it is best to go quickly, in case it will get repatriated again to China. The Senckenberg museum could not have identified that the fossil was smuggled out once they purchased it because the regulation was once much less well-known. However in line with an article by Liston and You, issues had been clarified a bit in 2013. When you’re questioning if a specimen was legally exported from China “the simplest method to test is to search for the distinctive Ministry of Land and Assets registration quantity, with which your materials ought to have arrived. In case your materials has this quantity, then it has left the Folks’s Republic of China legally. In case your Chinese language fossil materials doesn’t have this quantity, then it’s acceptable to be involved as to only the way it got here to depart that nation.”

This episode was dropped at you by:

The Royal Tyrrell Museum. The Royal Tyrrell Museum is positioned in southern Alberta, Canada. One of many high paleontological analysis institutes on this planet, all the museum is devoted to the science of paleontology. It’s undoubtedly a should see for each dinosaur fanatic. Extra data may be discovered at tyrrellmuseum.com.



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