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Episode 274: Huge Al is now not Allosaurus fragilis


    Episode 274 is all about Haplocanthosaurus, a comparatively small sauropod measuring a measly 49 ft lengthy and 13 tons in weight.

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    On this episode, we focus on:


    • Huge Al is now Allosaurus jimmadseni and now not Allosaurus fragilis supply
    • A brand new set of sauropod tracks in Texas could possibly be swim tracks—or perhaps not supply
    • Storm Ciara within the UK uncovered a brand new 130 million yr outdated dinosaur footprint supply
    • Colin Trevorrow shared a video of what seems to be like a Nasutoceratops puppet from Jurassic World 3 supply

    The dinosaur of the day: Haplocanthosaurus

    • Sauropod that lived within the Late Jurassic in what’s now Colorado, US, and probably Wyoming (Morrison Formation)
    • Uncommon sauropod within the Morrison Formation
    • One of many smallest sauropods from the Morrison Formation
    • Estimated to be about 49 ft (14.8 m) lengthy and weigh 13 tons
    • Comparatively small bodied and comparatively brief tail
    • No cranium discovered, which makes it laborious to categorise (could also be a detailed relative of Camarasaurus?)
    • Principally discovered vertebrae
    • Some debate over phylogeny however a 2015 examine discovered it to be a diplodocoid
    • Two species: Haplocanthosaurus priscus (sort) and Haplocanthosaurus delfsi
    • Genus identify means “easy spined lizard”
    • First described from specimens collected on the Marsh-Felch Quarry in Colorado
    • John Bell Hatcher was not too long ago appointed curator of vertebrate paleontology on the Carnegie Museum in 1901, and reopened the Marsh-Felch quarry in Backyard Park, Colorado, the place he and his group discovered two medium-sized, partial skeletons of Haplocanthosaurus priscus
    • Hatcher named Haplocanthosaurus in 1903, as Haplocanthus. However 4 months later modified the identify to Haplocanthosaurus as a result of Haplocanthus was “primarily preoccupied” (it was the identify of a fish that Louis Agassiz named in 1844)
    • Nevertheless, the fish was spelled “Haplacanthus”, not “Haplocanthus”
    • Seems Hatcher didn’t have to rename the dinosaur. As a result of the spelling of the fish was completely different, the identify Haplocanthus was legitimate, till a petition was despatched to the ICZN and so they dominated in 1991 that Haplocanthosaurus was the right identify due to widespread use (like how they dominated that T. rex was the legitimate identify)
    • Hatcher printed a monograph in 1903 after which named a second species, Haplocanthosaurus utterbacki, however that is now thought of to be a juvenile Haplocanthosaurus priscus
    • Haplocanthosaurus delfsi was named within the Fifties, based mostly on a specimen nicknamed Glad
    • Glad was present in 1954 and estimated to be 72 ft (22 m) lengthy and weigh about 25 tons
    • Glad was collected between 1945 to 1957 in Fremont County, Colorado. Excavations have been led by Edwin Delfs, who as an undergrad biology main at Yale on the time. Native rancher Joe Rhode did the bulldozer work
    • Glad was discovered mendacity on its left aspect, and largely articulated (cranium lacking, neck bent backward in dying pose), additionally lacking different parts, together with components of the tail
    • Glad was about 35-50% bigger than the holotype of Haplocanthosaurus priscus, and was named a brand new species: Haplocanthosaurus delfsi
    • Additionally discovered turtle fragments, remoted theropod tooth, crocodile Eutretauranosuchus, round Glad
    • Glad was restored (about 70% actual fossils, the one Haplocanthosaurus full sufficient to show), and lacking components modeled or solid from specimens within the AMNH; cranium and mandible modeled in a “generalized sauropod vogue”
    • Can now see Glad on the Cleveland Museum of Pure Historical past
    • Could also be as much as ten specimens assigned to Haplocanthosaurus (not all are but confirmed). One is nicknamed “Huge Monty” (present in Montana) and regarded as 110 ft (33 m) lengthy, however controversial and never a lot recognized in regards to the specimen (discovered by Nate Murphy, who runs the non-public firm Judith River Dinosaur Institute, that finds, excavates, and prepares fossils; Nate estimates the 110 ft size, Cary Woodruff believes it’s smaller, based mostly on one of many 3-ft lengthy vertebra, which isn’t large for sauropods, and thinks it’s not a brand new species however that it’s a uncommon Haplocanthosaurus)

    Enjoyable Reality:
    Whereas the Dinosaurs arose following a 100 million yr ice age, there was little to no ice throughout the complete Mesozoic. Nonetheless, sea degree modified steadily from tectonic plate exercise and different local weather modifications.

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