Silesaurids and the Evolution of Ornithischian Dinosaurs
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- เผยแพร่เมื่อ 5 พ.ย. 2022
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Silesaurids as basal ornithischians makes a lot of sense to me. Great video!
When i was a kid Pisanosaurus was an ornithischian but as an adult it could be both an ornithischian or a silesaurid. If it's not an ornithischian then we have no record for ornithischian until the very start of the early jurassic bringing up the controversial question of where they originated in the fist place.
Basal ornithisician would probably look similar to Kulindadromeus
I'd say that Pisanosaurus may be an Ornithischian
Depending on where silesaurids are placed, pisanosaurus could be both
The 2017 paper that claimed Sauropodamorpha were the outgroup was almost purely based on fuzzy body-covering, which is flawed because body-covering varies even within families of Dinosaurs. There was a later study that covered the multiple times herbivory evolved in Dinosauria, & it seem to support the more traditional placement of Ornithischia being the outgroup.
Yeah I was never really onboard with the Ornithoscelida hypothesis from the beginning. Seems the traditional interpretation is better supported.
now that the fuzzy covering may be even in pterosaurs this doesn't make much sense.
Great video! Thanks for bringing up our paper, it has been a wild journey trying to understand more about silesaurids and their affinitties with ornithischian dinosaurs. Few months ago we published a broad and deep paper further on this matter, recommend you to check it out. All the best
Wow, thanks so much for watching my video! I’ll be sure to check out your additional research on the subject.
Thank you for sharing this best understanding of this colossal and charismatic group. We can only hope to see the ornithischian Rosetta Stone in our lifetimes, one that could properly tidy up the relationships between the major groups as well
That would be a great find indeed!
The best thing about this channel is that I always learn something new every time I watch. Thank you for that!
This channel and Chimerasuchus
it's so nice to hear about Lesothosaurus for the first time since my childhood
i love you polar bear man
people often tend to forget the possibility of omnivorous dinosaurs. it doesnt get mentioned all that often
One day can you make a video on "forgotten" or "ignored" mammals? Like Vishnuichtis?
Multituberculates would be the best
I can't even imagine the amount of time and research required to make a video like this. Excellent work!spent
Very true, a lot of knowledge and names of dinosaurs required .
Such a shame that, thanks too political relationships between the US and Venezuela or Iran for that matter it's difficult/impossible to do research in clearly ancient rockformations in those countries. It would greatly help archeology, paleonthology and biology and therefore science overall to understand the history of life on Earth.
I sometimes fall asleep to these types of videos but your intro song has this quality to shoot me awake which is probably a good thing so I don't sleep in front of the computer! The videos are very calming and informative otherwise!
At last! I was waiting for this topic for a long time.
Now I do hope Dr.Polaris will do in-depth turtles. Chinlechelys returned the parareptile theory back on the table. Hard one but I believe in Dr. Polaris.
Very interesting and informative, as usual.
Thank you for bringing education on this poorly understood and covered period. Your work is much appreciated.
I never clicked on so fast. So I can enjoy your content
Maybe so, but you're STILL a birdbrain.🐦🧠
@@nicksweeney5176 Swawk
@@cyankirkpatrick5194
Mm-hmm. They said you'd say that.🤔
@@nicksweeney5176 Cringe
@@nicksweeney5176 The only bird brain is you.
Silesaurids being actualy stem ornithishians would be yet another nail in ornithoscelida coffin, showing basal ornithischians having more "primitive" traits then saurischia.
Alternative exploraiton fo Or. poor fosil record in triasic might by taphonomic bias (my personal sugestion is early evolution of ornithishians happened in some enviroment with poor fosilization of bones such as forest or mountains).
Another alternative (and let´s be real this one will go into taxonomic fanfic territory) might be ornithishians being in fact more inside theropoda with basal theropods being stem ornithoscelida and ornithischians separated from theropods in early jurrasic period.
Beautifull video.
If silesaurids are stem Ornithicians wouldn't that mean that the dinosaurian traits in Ornithicians are convergent? Wouldn't that mean that Ornithicians aren't dinosaurs but derived silesaurids instead?
Nah, because Dinosauria is defined as every animal descended from the common ancestor of Triceratops and the house sparrow. If ornitischians are in fact derived silesaurs, they by definition are still dinosaurs, and so are the silesaurs.
@@adriani9432 oh right, I forgot about that definition.
Thanks a lot for uploading this informative video - made my evening!
I hope so, and cheerio to you too!
Is everyone forgetung about the misspelings? Like Sacisaurus being speled as "Sækisaurus"
fun fact - silesia is one of the worst places in Poland
Cold
@Ammonite Studios polluted air due to industrialization and coal, mean people with their own language, larping as Germans, xenophobia to other polish people and superiority complex
I'd only wish people would quit saying bird brain, wait a minute that's a compliment 😜😁🤔
Bird brain originated from pheasants specifically and if you ever encounter one, you will quickly realize why.
@@chrisdonish yeah they are extremely dumb. I lived near some who lived in a group near a park when I was little and my dad brought me there after taking me from school. We'd feed them and they'd peck the ground near the pieces of bread we gave them they literally missed by meters I don't know why they do this
Interesting, thank you .
Please, more Spec Evo content.
I hope you take a moment to compare/contrast the nasal structures of Asian and North American brontotheres (i.e. Embolotherium v. Megacerops)
Hello everyone, Dr. Polaris here ... and your heart will explode with joy! ❤️🤩 New episode and again super good and informative. 🦖 🤓👍🏽
But hey, can we finally rethink the term ornithischia. The term is outdated. Come up with something, dude. 😅
Please consider making a video on the evolution of ratites, or varanids, if you’d wish.
Not critiquing, just as a curiosity.
The "u" in "laquintasaura" is probably silent.
...
Thecountryhousesaura...
I think I see what you mean. Much like the "u" is not pronounced in the Spanish phrase "la quinta."
Im making a dino book
and i dont no how i should place silesaurids
Right after the evolutionary history of Brontothere Evolution, why don’t you also get to make a suggestion to create the TH-cam Videos Shows about the Eurasian Cave Lions (both Panthera leo spelaea and Panthera leo fossilis), also known as the European Cave Lions, or the Steppe Lions, the Big Cats of both in Eurasia and Europe in the Pleistocene Ice Age Epoch of the Cenozoic Era in just a couple of weeks to think about that one coming up next?!⭐️⭐️⭐️⭐️⭐️👍👍👍👍👍
The "qui" in **Laquintasaura** sound like "ki", given it's spanish root.
Wasnt there some brasilian paper few years back confirming polish research that Sileosaurus was protoornitishian?
One tiny thing, bro: the C in Sacisaurus must sound like the S in saurus. Can you make a video on Josephoartigasia?
The illustrations by Nix are just ridiculous speculation
Do you think that the evolutionary pressures on carnivorous animals is greater than herbivores? If it is a principle, then it makes sense that dinosaurs evolved from small carnivorous ancestors.
I can't help but think that herbivory evolution is more driven by slow changes to the environment such as climate whereas carnivory is driven by how much better you can catch and eat which makes me think that adaptations among carnivores is faster.
It's the same reason as the Panda
The Theropoda/Sauropodamorpha - Ornithischia split seems the most likely, while the Sauropodamorpha/Herrerasauridae - Theropoda/Ornithischia split, and the Theropoda - Sauropodamorpha/Ornithischia split, really don't make as much sense.
Ślunski dinozaur 👍🏼⬜🟥🇵🇱🇵🇱🇵🇱
When will you return to cryptozoology?
If silesaurids are stem Ornithicians wouldn't that mean that the dinosaurian traits in Ornithicians are convergent? Wouldn't that mean that Ornithicians aren't dinosaurs but derived silesaurids instead?
Nope. Ornithisician are still dinosaurs
No - 2 of the 3 founding members of Dinosauria are Ornithischian (Iguanodon & Hylaeosaurus) while another helps define the cladistic definition of dinosaur (Triceratops). If silesaurs are Ornithischians, then they automatically become dinosaurs.
Taken together, your presentations paint a marvelous picture of the diversity of life this planet of ours once possessed. Can’t help but wonder where life would be today if that asteroid had missed us. Certainty it would be better than it is and will be so long as Homo sapiens exists.
Might this not also mean that Ornithischians were not Dinosaurs at all?
That's impossible because when the clade Dinosauria was established in 1842 it was proposed as a way to group Megalosaurus, Iguanodon and Hylaeosaurus. So by definition Dinosauria includes the last common ancestor of these 3 animals and all of its descendants. Since Iguanodon and Hylaeosaurus are both ornithischians that means that this group are definitely dinosaurs. The same goes for theropods, because of Megalosaurus. What can happen however is that if hypothetically, although I doubt it, the Ornithoscelida theory turns out to be correct, then an argument can be made that Sauropodomorphs may not be dinosaurs because they are not part of the group by definition and their inclusion depends on their relationships with the 3 aforementioned taxa. Though l'm pretty sure that if this ever happened an excuse will be made to let them remain dinosaurs for traditional reasons, like they changed rules of the nomenclature so that T.rex wouldn't have to become Manospondylus gigas.