Episode 464: Dinosaur enamel! Tyrannosaur enamel in Yellowstone, spinosaur enamel in Early Cretaceous England, and extra. Plus Brian Engh joins to debate his documentary sequence on the Morrison Formation.
Information:
- The primary tyrannosaur tooth ever described from Yellowstone Nationwide Park supply
- Machine studying primarily based on Maniraptoran enamel decided they have been round about 30 million years sooner than beforehand thought supply
- A tooth reveals there have been extra spinosaurs within the Early Cretaceous in what’s now England supply
- There was a various theropod group dwelling in what’s now southern Chile up till the Okay-Pg extinction occasion supply
Interview:
Brian Engh, a paleoartist and creator of the documentary sequence Jurassic Reimagined. You could find his work at dontmesswithdinosaurs.com on YouTube @DinosaursReanimated on Patreon at HistorianHimself and on twitter and Instagram @BrianEngh_Art
The dinosaur of the day: Eoabelisaurus
- Abelisaur that lived within the Center Jurassic in what’s now Chubut Province, Argentina (Cañadón Asfalto Formation)
- Regarded considerably much like Majungasaurus
- Walked on two legs, and had a protracted head, lengthy tail, cumbersome physique, highly effective legs, and quick arms
- In contrast to Majungasaurus, no head ornamentation discovered
- Had quick neck vertebrae
- Had 4 fingers on every hand
- Had sturdy, sturdy legs
- Estimated to be as much as about 20 to 21 ft (6 to six.5 m) lengthy
- A later estimate discovered it to be 19 ft (5.8 m) lengthy
- Had heavy shoulder blades
- Identified for its very quick arms
- Kind and solely species is Eoabelisaurus mefi
- Genus identify means “daybreak Abel’s lizard” and refers to the truth that it’s an early relative of Abelisaurus (talked about Abelisaurus in episode 79)
- Species identify is in honor of MEF, the abbreviation for the Edigio Feruglio Museum of Palaeontology, the place Diego Pol, who discovered the fossils, is energetic
- Diego Pol discovered the fossils in 2009
- Described in 2012 by Diego Pol and Oliver Rauhut
- Holotype features a almost full skeleton with a cranium, of both a subadult or grownup (many of the backbone, each legs and arms, components of the cranium—lacking the entrance of the cranium, decrease jaw, finish of the tail, although they did discover 27 tail vertebrae)
- The again half was articulated
- First grouped as an abelisaurid, however later grouped as an abelisauroid
- Eoabelisaurus helps present how abelisaurs developed
- Earlier than Eoabelisaurus, the oldest identified abelisaurids weren’t well-known (solely fragments), and solely definitively identified from the Early Cretaceous
- Eoabelisaurus helps present that abelisaurids have been round 40 million years longer/sooner than beforehand thought
- Abelisaurids have been bipedal carnivores, identified for his or her stocky legs and ornamentation on their skulls, like crests or horns
- That they had quick arms, typically with out wrist bones, 4 stubby fingers on their fingers, quick however tall skulls, and plenty of had bony crests above their eyes
- They lived from the Center Jurassic to the Late Cretaceous and have been present in Africa, South America, India, Madagascar, Portugal, and France
- Abelisaurs are principally identified from the Southern Hemisphere
- Abelisaurs have been the tyrannosaurs of the Southern Hemisphere
- Eoabelisaurus lived earlier than Gondwana cut up off. Could possibly be there was an enormous desert that saved abelisaurids from going north
- Eoabelisaurus arms have been shorter like later abelisaurids, equivalent to Majungasaurus, which lived on the finish of the Cretaceous
- Different abelisaurids from the Early Cretaceous had longer arms
- Eoabelisaurus’s higher arm was longer than the decrease arm (higher arm was really regular in measurement), which can imply abelisaurs began evolving shorter decrease arms first earlier than transferring on to the higher arm
- Quick arms present that abelisaurids began getting shorter arms early of their evolution
- With its small arms, most likely used its enamel extra to go after prey. In all probability had a strong chew
- Different dinosaurs that lived across the identical time and place embody theropods equivalent to Asfaltovenator and Condorraptor, in addition to indeterminate spinosaurs, megalosaurs, and extra, sauropods equivalent to Bagualia, Patagosaurus, and Volkheimeria, and ornithischians such because the heterodontosaurid Manidens
- Different animals that lived across the identical time and place embody mollusks, bugs, fish, amphibians, turtles, crocodylomorphs, pterosaurs, mammals
Enjoyable Truth:
Moths developed their proboscis to cope with the cruel arid setting of the early Mesozoic—permitting them to drink water droplets like tears immediately from dinosaur eyes.
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