Daspletosaurus Fossils Reshuffle Tyrannosaur Evolution! | TYRANT FILES

The Tyrannosaurs are probably the most well-known group of dinosaurs. This is due to a wealth of fossil material compared to other theropod dinosaurs and even other groups of dinosaurs. There is a new tyrannosaur named every couple of years, but despite a growing number of new critter data for the phylogenic nerds to munch on, the exact evolutionary relationships amongst the latest forms of this most famous of groups has been slippery. Every new critter tends to shake up the tyrannosaur tree in one way or another.
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✅ RESEARCH ✅
Warshaw, E.A., Guevara, D.B., Fowler, D.W., Anagenesis and the tyrant pedigree: a response to “Re-analysis of a dataset refutes claims of anagenesis within Tyrannosaurus line tyrannosaurines (Theropoda, Tyrannosauridae)”, Cretaceous Research, doi.org/10.101...
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[@christianv-h3278]

Hey, thanks for featuring our research!! (second author from Scherer & Voiculescu-Holvad 2024 here) Great video mate! And stay tuned, there's more tyrannosaurine interrelationships work to come in the near future 😉

[@EDGEscience]

Hope I pronounced your name right! Would love to work with you and your colleagues to make science outreach like I did here.

[@SRMC23]

so if i got it right: daspletosaurs appear first on North America, they migrate to Asia during one of the colder parts of the period thanks to temporary island chains enabling passage, those daspletosaurs that remained gave rise to albertosaurines up north and the tyrannosaurs down south while tarbosaurs convergently arose from the asian daspletosaurs.

[@Andrey.Ivanov]

Albertosaurines didn't evolve from Daspletosaurus, as they diverged separately from all other tyrannosaurids. The idea according to this study is that Daspletosaurus is ancestral to Tyrannosaurini. Since the oldest in this clade is Zhuchengtyrannus we can speculate that at some point Daspletosaurus reached Asia. But the study can't answer whether Tyrannosaurus came from Daspletosaurus population that remained in North America or if it was a product of a secondary migration of Tyrannosaurini similar to Zhuchengtyrannus and Tarbosaurus from Asia back to North America.

[@hankskorpio5857]

Bro you are such a freaking G for using all this old 90s-2000s educational show music. Makes my heart ache in a good way. I feel so bad for young people nowadays. Its so sad what masquerading as educational content now.. its so bad now and I see no hope of improvement.

[@JAGzilla-ur3lh]

Having quality material representing a line of Daspletosaurus species directly evolving to and from one another is really interesting and valuable. Now we just need some finds like this for the Early Cretaceous...

[@jamesabernethy7896]

These kinds of events are truly fascinating. It's not merely adding something new to our understanding of history but changing what we think we know. A really nice video.

[@EvilgnomeTV]

I think there's a potential for an ASMR of you just calmly reading out species and genus relationships for an hour.

[@Stegosaurus.Stenops]

Edge posted, I have been summoned

[@geenflauwidee]

Great video to have with my morning coffee! Thanks EDGE!

[@seanessdracosaurus2793]

What a wonderful day

[@dacios6776]

WHAT A WONDERFUL DAAAAAAY!!!

[@barrybarlowe5640]

This is starting to sound like the arguments around Spinosaurus.

[@thegameres816]

Truly so happy to be welcomed with an EDGE video right when I wake up❤!

[@user-pr8gx3vb9h]

Good finds and reveals to add character depth to this species.

[@amberleerust4592]

how about tyrannosaurus mcraensis?

[@TheTrueTyrannosaurusRex]

Relatively new, can't say much on it so best leave it alone for now. Until we have the studies and info

[@AmericanAdvancement]

He addressed T. mcraensis along with Zheuchengtyrannus in that they're separated by approximately 100,000 years. That's about the amount of time it took for modern humans to spread around the world, but is the blink of an eye geologically speaking. The part that the study doesn't answer is whether or not the genus Tyrannosaurus is part of its own group that descended from a southern migrating daspletosaurus population, a branch of Asian Tyrannosaurini, or something entirely different. My hypothesis based on this study is that one group of daspletosaurus followed a migratory population of ceratopsians that became sinoceratops while another group migrated south to fill a possible void left by the disappearance of the teratophoneini and this southern population is what would eventually become Tyrannosaurus.

[@VanessaScrillions]

So excited to get home from work, relax, and watch a new Edge video!!! Yay 😊

[@Makabert.Abylon]

I would like a video about on what percentage of large therapods during the dinosaur era we might have found. We should be able to guestimate how many large carnivores an ecosystem can hold and all the different continents and then how long a species in general last and for contra what we have found where and from when.

[@_Tygon_]

death note music hehe

[@dynojackal1911]

My understanding is that basal tyrannosaurids migrated to North America at the same time as stem/basal ceratopsids (i.e. Zuniceratops and Sutskityrannus). The alioraminins were an endemic Asian clade that probably filled the same ecological niche as albertosaurines in Laramidia. The teratophoenins and daspletosaurins were separated (mostly) by latitudinal barriers, while the tyrannosaurins would eventually replace most previous tyrannosaurid groups.

[@AmericanAdvancement]

That's more or less correct, although the current evidence at hand is beginning to support the idea that tyrannosaurini could be split into an Asian branch with narrower skulls and teeth more optimized for flesh tearing and a Laramidian branch that had broader skulls and a more robust build that was better suited for taking on large ceratopsians and ankylosaurs. The evidence as it stands now supports the tyrannosaurini being directly descended from two branches of the daspletosaurini, one that went into Asia to follow a ceratopsian that would evolve into sinoceratops, and another group that migrated into southern Laramidia after the teratophoneini went extinct around 75 mya. It's no coincidence that tyrannosaurus got enormous in the south because there was a whole host of big game that could be exploited by a predator that was big enough to take them down like pentaceratops, magnapaulia, and alamosaurus.

[@LeoTrex]

11:11 hello! sorry but it's SRleotrex444 ^^"

[@EDGEscience]

Apologies 🙏

[@felixjohnson195]

What a beautiful day!!

[@jthomas8263]

But what about Tyrannosaurus Mcraeensis from the Southern Laramidia that mainly migrated up to the North that which gave rise to Tyrannosaurus Rex, and crossing Land Bridges into Asia.

[@AmericanAdvancement]

Zheuchengtyrannus is at least 100,000 years older than T. mcraeensis, so if there was a second Beringian crossing then it would have been from Asia to North America. That being said, I'd argue that T. rex's ancestor didn't migrate into northern Laramidia until after the bearpaw sea began to disappear. This disappearance would also cause albertosaurus to go extinct and would open the role of apex predator for T. rex to fill.

[@enzoleonardo2197]

Good video

[@E-K-6]

Thank you ❤

[@BMO_Creative]

This isn't evolution... It's adaptation.

[@EDGEscience]

One leads to the other

[@mateo3993]

🦖🦖

[@tyrannotherium7873]

Maybe who knows maybe there is a Asian daspletosaurus but I highly doubt it

[@Andrey.Ivanov]

Why? There are big gaps in the fossil record. We usually have good fossil remains from a few ecosystems from at any given point in time and even then we definitely don't know every animal that lived at these places during that time.

[@AmericanAdvancement]

There's a large gap in the fossil record of Asia that stretches from roughly the Turonian to the Maastrichtian. The time period in question, the campanian, has a sparse fossil record in asia and the few that have been found have a preservation bias towards smaller animals like velociraptor and protoceratops while the fossil record in north america around the same time period is about as complete as anyone could hope for. The lack of even trace fossils of a large tyrannosaur in Asia until the evolution of Daspletosaurus around 78 million years ago lends credence to the study since the earliest tyrannosaur, zheuchengtyrannus, evolved around 73.5 million years ago. Combine this with the established geological fact that the bering landbridge opened and closed routinely throughout the late cretaceous and cenozoic and you have some solid footing that this study stands on.

[@tyrannotherium7873]

@@Andrey.Ivanov I’m just making shit up lol

[@MrWanapon]

I thought Tarbosaurus and Daspletosaurus evolve from Alectrosaurus

[@EDGEscience]

Nope!

[@MrWanapon]

@@EDGEscience DOH! I thought the age and size makes sense. So what's your comment on this kzbin.info/www/bejne/hXTcp5yleNmeg68&ab_channel=DinosaurDocumentaries 21:17 - 21:39 and 22:12 - 22:22

[@barrybarlowe5640]

Another factor is cross breeding. Like our prairie grouse, T-Rex of various backgrounds, but similar time frames may, due to seasonal urges, cross bred with other earlier or later versions of T-rex to produce hybrids.

[@EDGEscience]

Earlier or later versions? Are you proposing a time traveling tyrannosaur?

[@soybasedjeremy3653]

​​@@EDGEscienceHe's saying it's possible other tyrannosaurids interbred, such as Daspletosaurus and Albertosaurus, even Gorgosaurus. Resulting in hybrids leading to possibly pre Tyrannosaurus rex. Like Cro Magnon (Earlier versions of Homo sapiens). Which look slightly different from me and you, such as a slight brow ridge, robust bones. And Homo sapiens with other species of the genus Homo did interbreed with one another. I suspect Tyrannosaurus mcraeensis is a possible example of that. Eventually evolving into Tyrannosaurus rex. Given there are slight differences. I don't think it's out of the possibility that dinosaurs interbred with their close relatives, eventually causing new species. If other species can do it, so can they! Like Coyotes with domesticated dogs, did create the Eastern Coyote.

[@EDGEscience]

A) All these dinosaurs are different genera. All the humans you used as examples, and the majority of animals that do hybridize, are different species within the same genus. Those animals that hybridize today, that are different species, are EXTREMELY closely related. None of this can either be said or proven for dinosaurs. B) Hybridization is possible. Everything is possible. However, if you are dealing with a small sample size of dinosaurs that all differ from one another AND are possibly separated by 1k years to as much as 1 million years, Hybridization becomes an untenable hypothesis. The humans that hybridized did so as they were in the exact same place, at the exact same time, and had nearly identical DNA. This cannot be said of dinosaurs. C) Science is a method. ANYTHING is technically possible, but science helps to find what is most probable or parsimonious. That would be the explanation you go with, because that explanation has the most evidence and the least number of assumptions needed.

[@soybasedjeremy3653]

@@EDGEscience What I said and you said is thought provoking, maybe do a video on this subject?

[@Gerd93.5]

Interesting. Unfortunately, I don't think nothing can really ever be cemented in those arguments. Just too long ago...and the fossils that could prove either way don't exist (didn't preserve...!) or unaccseable....

[@EDGEscience]

That's not a really good counterargument.

[@secretospaleontologicos]

Make a shorter introduction, stablish what you are gonna talk about in about 20 seconds, immediately when the video starts, have a peak in the middle, this is an increase on dramatism, showing something at steak, and make shorter, more concise explanations and people will watch your videos much more

[@evodolka]

Can agree, the intro is a tad long

[@EDGEscience]

That doesn't BRING people to watch. Quality has nothing to do with draw. You should have more subs and views according to your own advice, but you don't. All that matters here is getting the view in the first place. One can worry about keeping the viewer after that (I've been able to keep viewers very well despite any issues you may note). PS, I meant that as a compliment lol I think most channels should have more subs and views. You deserve it.

[@TheTrueTyrannosaurusRex]

​@@EDGEscience Damn, bro cooked. Dayum

[@thegameres816]

I beg to differ. The intro always brings me back to childhood and Lols me into a calmness. Sometimes things are there for other people to enjoy. You can sit down now.

[@cameronwalton8270]

@@EDGEscience didn’t you post about losing viewers just a couple days ago?

[@LordBorborygmus]

Is it possible that some of the different "species's" are a different gender of the same species?

[@EDGEscience]

Sure, but they're separated by time, so 🤷 plus theropods don't show extreme levels of sexual dimorphism (aka you wouldn't likely ever be able to tell).

[@LordBorborygmus]

@@EDGEscience Ohh, thank you, that makes sense.