I Know Dino Podcast Present Notes: Antetonitrus (Episode 150)

Episode 150 is all about Antetonitrus, a sauropodomorph whose title means “Earlier than the thunder,” as a result of it lived earlier than Brontosaurus.

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On this episode, we talk about:


The dinosaur of the day: Antetonitrus

  • Sauropodiforme that lived within the Triassic/Jurassic (boundary) in what’s now South Africa (Elliot Formation)
  • Named in 2003 by Adam Yates (co-authored by James Kitching)
  • Kind species (and solely species) is Antetonitrus ingenipes
  • Identify means “Earlier than the thunder”, which refers to it current earlier than Brontosaurus and different identified sauropods
  • Species title means “large foot”
  • Fossils have been present in 1981 by Kitching, they usually have been saved on the Bernard Value Institute for Palaeontological Analysis, College of the Witwatersrand, Johannesburg
  • They have been initially labeled as Euskelosaurus, till Yates advised they have been a separate taxon
  • The holotype consists of vertebrae and bones from the forelimb and hind limb
  • 5 limb bones from a smaller specimen have been additionally referred to Antetonitrus
  • Holotype was about 26-33 ft (8-10 m) lengthy, however the neural arches of the vertebrae weren’t fused with the centra, so it might not have been absolutely grown
  • Had an extended neck
  • Cranium shouldn’t be identified
  • Principally quadrupedal herbivore, however had primitive diversifications to make use of forelimbs for greedy, along with supporting its weight
  • Had forelimbs that have been longer than its hindlimbs
  • The primary digit of its hand (the “thumb” or pollex”) have been nonetheless versatile and able to greedy (later sauropods had giant, thick wrist bones, and their palms have been locked in a technique to assist its weight full time)
  • Antetonitrus did have broader, thicker wrist bones, so it reveals an adaptation
  • Ft present the start of growing to assist nice weight
  • Additionally the primary toe on its foot had a claw, although it wasn’t sickle formed like in later sauropods
  • Could possibly be a transitional hyperlink between bipedal sauropodomorphs and quadrupedal sauropods
  • Not essentially a direct ancestor to sauropods nevertheless. Scientists have categorized it as a sauropodiforme (an animal that has options associated to the origin of sauropods)
  • Intently resembles Blikanasaurus and Lessemsaurus (however each of these are poorly identified)

Enjoyable Truth:

Again in 2007 the lead writer on the crustaceans-in-poo article, Karen Chin, additionally reported on dinosaurs consuming wooden. That point whereas learning the Two Drugs formation and coprolite believed to be from Maiasaura.

  • ~74–80MYA formation
  • Recognized as coprolite by dung beetle burrows
  • Cited lack of twigs as deliberately consuming wooden
    • Not unintended whereas consuming leaves
    • Conifer wooden accounted for 13%–85% of every coprolite
  • This wooden was additionally decaying (fungus), probably that means that the fungus broke down the wooden into one thing bioavailable
    • Even hadrosaurs with their grinding tooth and big stomachs couldn’t get a lot dietary worth from wooden
    • Cited this as a probably helpful useful resource given the general lack of grasses and different angiosperms that trendy herbivores favor

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