Episode 497: Find out how to Inform a Tyrannosauroid from a Ceratosaur and a Maniraptoran. We discover the variations between the important thing teams of theropods. Plus an incredible new Psittacosaurus discover; The brand new Allosaurus kind specimen is official; And new methods verify one other predator that lived alongside Spinosaurus.
Information:
- A brand new distinctive Psittacosaurus has each reptile like scaly pores and skin and fowl like feather-covered pores and skin supply
- Allosaurus has a brand new kind specimen (the Smithsonian’s skeleton) supply
- Combining a number of methods to check remoted tooth, paleontologists discovered 4 several types of theropods within the Kem Kem Beds in Morocco, together with a uncommon noasaurid supply
Listener Query:
The foremost teams of theropods and their distinctive traits
Sponsor:
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The dinosaur of the day: Cruxicheiros
- Tetanuran theropod dinosaur that lived within the Center Jurassic in what’s now Warwickshire, England (Chipping Norton Limestone Formation)
- Tetanurans are carefully associated to trendy birds. It’s a giant clade that features most theropods, together with Megalosaurus, Tyrannosaurus, and Spinosaurus
- Too fragmentary to slender it down additional than a tetanuran
- Seemed just like Megalosaurus
- Walked on two legs, muscular physique, had a big head, lengthy tail, quick arms
- Massive carnivore, with sharp tooth
- Estimated to be about 9 m (nearly 30 ft) lengthy
- For a very long time regarded as Megalosaurus
- Fossils discovered within the early Nineteen Sixties
- Fossils most likely collected in a single or two subject seasons, although there will not be actually any detailed collections data
- Fossils had been on the Birmingham Museum and Artwork Gallery till 2008 (was a part of a brief show within the early Nineties), and once they had been transferred to the Warwickshire Museum Service they had been extra carefully studied
- A number of theropod fossils discovered from that space had been thought to belong to Megalosaurus for a very long time
- Holotype is a partial proper thigh bone (femur)
- Extra fossils discovered embody some vertebrae, a part of the shoulder, a part of the hip, and rib and bone fragments. Regarded as from the identical particular person because the holotype, based mostly on the relative sizes of the bones and the truth that there are not any duplicate bones
- Has sufficient variations from Megalosaurus to make it distinct, reminiscent of a ridge inside a groove on the femur that’s totally different from Megalosaurus
- Sort and solely species is Cruxicheiros newmanorum
- Described in 2010 by Roger Benson and Jonathan Radley
- Genus identify means “cross hand”
- Genus identify refers back to the Cross Fingers Quarry the place the fossils had been discovered
- Species identify newmanorum is in honor of the Newman household, who owns the quarry
- Helps present extra range of huge theropods within the space
- Different dinosaurs that lived across the identical time and place embody Cetiosaurus and Megalosaurus (it’s potential the “scrotum humanum” Megalosaurus fossil got here from the identical formation)
- Additionally dromaeosaurs, stegosaurs, troodontids, therizinosaurs (all indeterminate)
Enjoyable Truth:
Similar to us, the primary dinosaurs possible had 5 fingers and 5 toes.
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