Skip to content

I Know Dino Podcast Present Notes: Riojasaurus (Episode 239)


    Episode 239 is all about Riojasaurus, a Triassic sauropodomorph from Argentina which will have been bipedal.

    We additionally interview Tadd Galusha, author and illustrator of the graphic novel Cretaceous. He’s a comic book artist and illustrator, who additionally created the net comedian The Backwoods and labored on Godzilla and TMNT/Ghostbusters 2. You’ll be able to comply with him on Instagram or Twitter, @TaddGalusha, and get his ebook on Amazon.

    Massive because of all our patrons! Your help means a lot to us and retains us going! In case you’re a dinosaur fanatic, be a part of our rising neighborhood on Patreon at

    You’ll be able to take heed to our free podcast, with all our episodes, on Apple Podcasts at:

    On this episode, we focus on:


    • The hadrosaur Prosaurolophus might have grown a big squishy nostril because it aged to draw mates supply
    • In Chongqing, China, scientists have discovered a brand new but to be named dinosaur species supply
    • In Jiangsu Province, China, 4 dinosaur footprints have been discovered which had been beforehand attributed to legendary Chinese language people supply
    • In Nevada, the Las Vegas Pure Historical past Museum has a brand new exhibit, “Dinosaurs Take Flight” that focuses on Archaeopteryx supply
    • The Jurassic World Evolution Claire Dearing DLC was launched, we livestreamed it in Half 1, Half 2, and Half 3 on Youtube

    The dinosaur of the day: Riojasaurus

    • Sauropodomorph that lived within the Late Triassic in what’s now the La Rioja Province in Argentina (Los Colorados Formation)
    • Genus title means “Rioja lizard”
    • Kind species is Riojasaurus incertus
    • Incertus means unsure in Latin
    • Many people have been discovered, perhaps as much as 20
    • Grew to be about 33 ft (10 m) lengthy
    • Had an extended neck and tail
    • Had cumbersome legs, that had been dense and really massive for an early sauropodomorph
    • Had hole cavities in its vertebrae
    • Had 4 sacral vertebrae, as an alternative of three, like different early sauropodomorphs
    • Most likely was gradual, and scientists used to assume it walked on 4 legs, however might rear up on its hind legs
    • Forelimbs and hindlimbs are related in size
    • However in 2016 Scott Hartman discovered Riojasaurus was in all probability bipedal, as a result of the fingers had been comparatively straight again and the shoulder girdle was largely motionless
    • Could have been cathemeral, primarily based on the scleral rings present in Riojasaurus (in comparison with fashionable birds and reptiles)
    • Regarded as associated to Melanorosaurus, a basal sauropodomorph that lived across the Late Triassic, however research at Bristol College in England discovered some key variations, equivalent to longer bones within the neck
    • Each had been massive for his or her time
    • Named in 1967 by José F. Bonaparte
    • No cranium was discovered with the holotype, however José F. Bonaparte and José A. Pumares described a virtually full cranium in 1998
    • Cranium was discovered on an exploratory journey in 1986
    • From the again, the cranium appears fairly slender
    • Bonaparte and Pumares discovered the cranium had conical enamel, and so they additionally mentioned the tooth row within the decrease jaw is on the inner facet of the jaw, “and its exterior border, or cheek, extends to the anterior portion of the dentary, which suggests the presences of thick lips”
    • Additionally they discovered some shared derived characters between Riojasaurus and Coelophysis, which can imply they’d a detailed widespread ancestor (related top and elongation of the cranium, for instance)
    • Solely identified riojasaurid from South America
    • Different sauropodomorphs have been discovered within the Los Colorados Formation, together with Coloradisaurus and Lessemsaurus

    Enjoyable Truth: Richard Owen named Dinosauria in 1842, and one 12 months later he unknowingly reused the deinos root to call a dinosaur—the Moa Dinornis.