Episode 447: Dinosaurs in North America: That includes Prehistoric Planet 2

Episode 447: Dinosaurs in North America: That includes Prehistoric Planet 2. 80 ton Alamosaurus, Tyrannosaurus shedding to Quetzalcoatlus, and sauropods being killed by lightning (however not for the explanation you assume)


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Paleo Pins: Diversity Expansion

The dinosaur of the day: Pectinodon

  • Seems in episode 5 of Prehistoric Planet, season 2
  • Troodontid that lived within the Late Cretaceous in what’s now Wyoming (Lance Formation)
  • In all probability seemed bird-like, with feathers, lengthy legs, and being a troodontid, had sickle claws on the second toes (solely know its enamel)
  • As a troodontid, might have had good imaginative and prescient and will have gone after small prey
  • Sort and solely species is Pectinodon bakkeri
  • Genus title means “comb tooth”
  • Genus title refers back to the comb-like serrations on the enamel
  • Species title in honor of Bob Bakker
  • Described in 1982 by Kenneth Carpenter
  • In 1982, Kenneth Carpenter named Pectinodon in a paper about child dinosaurs from the Lance and Hell Creek Formations
  • Studied eleven taxa from 9 localities, based mostly on small enamel and components of skulls that had been discovered by screen-washing (underwater washing and screening)
  • Helped present that child dinosaurs weren’t as uncommon as had been beforehand thought earlier than that time
  • Holotype of Pectinodon is a tooth, paratypes and referred specimens are enamel
  • Discovered “crowns of enamel strongly compressed laterally and recurved”
  • Described as an apparently small species, weighing beneath 220 lb (100 kg)
  • Holotype is an grownup tooth, the biggest tooth, and is 6.2 mm lengthy and three.7 mm extensive (about 0.2 in by 0.1 in)
  • Paratypes are small and doubtless from infants
  • Different referred enamel are from adults
  • Tooth look much like Saurornithoides inequalis (beforehand referred to Troodon formosus and Saurornithoides junior)
  • Mentioned the enamel appears to be like much like Velociraptor enamel, however some slight variations within the serrations
  • Has been thought of to be synonymous with Troodon formosus
  • In 1991 George Olshevsky discovered it to be its personal species, Troodon bakkeri
  • In 2011, Lindsay Zanno and others analyzed how troodontids had been categorised, and located all of the specimens assigned to Troodon formosus had been in all probability totally different species, and agreed Pectinodon bakkeri was legitimate
  • In 2008, Longrich discovered Pectinodon to be legitimate
  • In 2013 Phil Currie and Derek Larson additionally discovered Pectinodon to be legitimate, and mentioned the enamel might be present in each the Lance Formation and Hell Creek Formation
  • Different enamel from Dinosaur Park Formation had been referred to cf. Pectinodon (laborious to categorise particularly)
  • In 1985 Lev Nesov named a second species, Pectinodon asiamericanus, based mostly on a tooth present in Uzbekistan, but it surely’s thought of to be a nomen dubium

Enjoyable Truth:

Sauropods would have been actually weak to lightning strikes, and never simply because they’re so tall.

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