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Episode 318: Bagualia alba: The Rise of Sauropods

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    Episode 318 is all about Genyodectes, The primary theropod described from South America.

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    On this episode, we talk about:

    Information:

    • An extinction occasion within the Early Jurassic might have led to the dominance of Eusauropods, together with the not too long ago named Bagualia supply

    • The brand new Triassic theropod Erythrovenator was present in Southern Brazil supply
    • In Fast Metropolis South Dakota, Dinosaur Hill is getting renovated to change into extra accessible supply
    • New graphic novel popping out subsequent July referred to as Operation Dragon that includes a Japanese-trained dinosaur military supply

    The dinosaur of the day: Genyodectes

    • Ceratosaur theropod that lived within the Cretaceous in what’s now Chubut Province, Argentina (Cerro Barcino Formation)
    • Kind species is Genyodectes serus

    • Genus title means “jaw chew”
    • Species title means “late”
    • Holotype consists of a part of the snout (premaxillae, components of the maxillas, proper and left dentary, enamel, and extra)

    • Not effectively preserved, a few of it’s articulated
    • Carnivorous
    • Had massive, protruding enamel, just like Ceratosaurus (lengthy and curved)

    • The way in which the enamel are organized within the premaxilla is exclusive, and solely seen in Ceratosaurus. The distinction between Genyodectes and Ceratosaurus is Ceratosaurus had three enamel in every premaxilla, and Genyodectes had 4
    • Estimated to be 20.5 ft (6.25 m) lengthy and weigh 1740 lb (790 kg)
    • Described in 1901 by Sir Arthur Woodward

    • Santiago Roth collected the fossils for the Museo de La Plata
    • Some quotes from Sir Arthur Woodward’s description:
    • “All of those enamel are a lot damaged”

    • “Sadly, nothing is understood of the jaws which bore related enamel in the course of the Cretaceous interval within the Northern hemisphere; however it appears most likely that the completion of the tooth-sockets and the paucity of successional enamel in Genyodectes are characters indicating that it was one of many newest and most specialised members of its race.”
    • Second non-avian dinosaur described from South America, after Loncosaurus
    • First identified theropod described from South America

    • For some time regarded as a nomen dubium, as a result of fossils have been so fragmentary, however a redescription in 2004 by Oliver Rauhut discovered it to be legitimate
    • At completely different factors regarded as megalosaurid, tyrannosaurid, theropoda incertae sedis, and abelisaurid. However Oliver Rauhut’s re-exaxmination eliminated the holotype from its “synthetic matrix” and located it to not have abelisaurid and tyrannosaurid traits, however to have many neoceratosaurian traits, and located it most likely got here from the Cerro Castaño Member of the Cerro Barcino Formation (earlier than, not fully clear the place the fossils had been discovered, however identified they have been present in pink sandstone)
    • Oliver Rauhut reprepared the kind materials. He wrote: “As is the case with the bones of the cranium, the dentaries are quite large”

    • Tooth within the premaxilla have been shut collectively and in “an overlapping en-echelon sample” (parallel formation at a slanted angle)
    • The fitting aspect of the cranium was barely deformed however not the left
    • Had lengthy maxillary tooth crowns, that have been longer than the “minimal peak of the dentary” (additionally solely seen in Genyodectes and Ceratosaurus, thus far)

    • Helps present early diversification of neocertosaurs in South America
    • Fossils are on the Museo de La Plata in Argentina
    • Different dinosaurs that lived across the identical time and place included titanosaurs Patagotitan and Chubutisaurus, and carcharodontosaurid Tyrannotitan

    Enjoyable Reality:
    From a phylogenetic standpoint, people are cynodonts. Cynodonts and different animals dominated the Triassic earlier than Dinosaurs stole their thunder.



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