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Episode 310: Mussaurus crawled as a child


    Episode 310 is all about Hypselosaurus, a sauropod discovered within the 1800s that was initially considered an aquatic crocodile.

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    On this episode, we talk about:


    • The Romer Prize session of SVP featured nodosaurids, huge crocodile muscle tissue, and using gastroliths supply
    • The Taphonomy & Stratigraphy session of SVP featured 3,000+ Edmontosaurus bones, sauropod tracks, & regurgitalites supply
    • The Schooling & Outreach session of SVP featured interactive dinosaur classes, area work, and many Augmented Actuality (AR) supply
    • The primary full Triceratops cranium present in Colorado is now on the Denver Museum of Nature and Science supply
    • The Pure Historical past Museum of Utah now has the Antarctic Dinosaurs exhibit supply

    The dinosaur of the day: Hypselosaurus

    • Titanosaur sauropod that lived within the Late Cretaceous in what’s now southern France (Grès à Reptiles Formation)
    • Initially considered 49 ft (15 m) lengthy, however now estimated to be 39.4 ft (12 m) lengthy and weigh 7.3 to 14.5 tonnes
    • Doubtful genus
    • First described in 1846, however not named till 1869
    • Named by Philip Matheron in 1869, Hypseolosaurus priscus
    • Genus identify means “highest lizard”
    • Initially, Matheron thought Hypselosaurus was an aquatic crocodile (stated the femur didn’t have medullary bone so it couldn’t have lived on land like Iguanodon)
    • Holotype features a partial hindlimb and two caudal vertrebrae, and two eggshell fragments had been discovered by the fossils
    • Pierre Philippe Émile Matheron described bones from Provence, France in 1846, then formally described them in 1869
    • A number of specimens have been referred to Hypselosaurus (Albert de Lapparent described a caudal vertebra in 1957, Bataller described a vertebra in 1960)
    • In 1993, a evaluate of sauropods in Europe discovered Hypselosaurus to be a nomen dubium, as a result of the holotype didn’t have distinguishing traits from different sauropods within the area, and in different areas
    • That might make Hypelosaurus materials to be an intermediate titanosaur
    • The 2 eggshell fragments had been spherical or ellipsoid, and Matheron proposed they had been both from a big hen egg or from Hypselosaurus
    • Eggs had been about 1 ft (30 cm) lengthy, which had been massive
    • Eggs will not be Hypselosaurus
    • First dinosaur eggs that we learn about had been present in 1859 by Jean-Jacques Pouech, a priest who additionally explored geology and paleontology within the Pyrenees Mountains. He wrote: Probably the most exceptional are eggshell fragments of very nice dimensions. At first, I assumed that hey could possibly be integumentary plates of reptiles, however their fixed thickness between two completely parallel surfaces, their fibrous construction, regular to the surfaces, and particularly their common curvature, positively counsel that they’re huge eggshells, no less than 4 occasions the quantity of ostrich eggs.
    • He thought they had been from a big hen (the time period “dinosaur” was not well-known on the time)
    • Additionally, dinosaur eggshells hadn’t been discovered earlier than
    • Then in 1869, Matheron, who named Hypselosaurus, discovered the eggshells and thought they could possibly be from an enormous hen or a “hypselosaur” which he considered a big crocodile
    • In 1877, Paul Gervais in contrast the microstructure of these eggshell fragments with these of various birds, tortoises, crocodiles, and geckos, to determine what laid them
    • He thought they matched tortoises, and stated we couldn’t know if the eggshells had been from a dinosaur “as a result of we fully have no idea the traits of the dinosaurs’ egg”
    • In 1923, Roy Chapman Andrews from AMNH discovered dinosaur eggs within the Gobi Desert, which acquired much more consideration than the eggshell fragments present in France
    • Now the existence of dinosaur eggs was accepted, and the fragments present in France had been reinterpreted to be dinosaur eggs
    • Shortly after, newbie geologist Maurice Derognat collected eggshell fragments in France close to Velaux and Rognac. Victor Van Straelen studied their microstructure and attributed them to Hypselosaurus
    • Extra eggs had been present in France the Nineteen Thirties and in 1947 Albert de Lapparent stated the eggs present in that space had been all from Hypselosaurus priscus.
    • Various kinds of egg shells have been attributed to Hypelosaurus (some had very skinny shells, considered due to modifications in vegetation or local weather, or overcrowding, which led to emphasize, or could possibly be laid by youthful people, or could possibly be completely different taxa)
    • Now thought almost definitely completely different taxa
    • Different dinosaurs that lived across the similar time and place embody dromaeosaurids Variraptor and Pyroraptor, ornithopod Rhabdodon, and ankylosaur Rhodanosaurus

    Enjoyable Reality:
    CLARITY (Clear Lipid-exchanged Acrylamide-hybridized Inflexible Imaging Tissue hYdrogel) can be utilized to make mind tissue clear and spotlight neurons. Extra lately it has been utilized in dinosaur developmental analysis.