Aphanosauria: Ancient Dinosaur Cousins
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- Опубліковано 7 бер 2020
- Aphanosauria ("hidden lizards") is group of reptiles distantly related to dinosaurs (including birds). They were at the base of a group known as Avemetatarsalia, one of two main branches of archosaurs. The other main branch, Pseudosuchia, includes modern crocodilians. Aphanosaurs possessed features from both groups, indicating that they are the oldest and most primitive known clade of avemetatarsalians. They were fairly slow quadrupedal long-necked carnivores, a biology more similar to basal archosaurs than to advanced avemetatarsalians such as pterosaurs, lagerpetids, and early dinosaurs.
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There's something unnerving about a long necked quadrupedal carnivore to me. It's like when I was freaked out by plesiosaurs as a kid because they were long necked like sauropods yet they had a mouth of sharp teeth.
Look on the bright side.
They might stomp you.
Does the Tully monster weird you out in the same way?
The Avemetatarsalian joint is actually *less* mobile and this is why it makes the animals more mobile.
could you explain this plsss?
It's very interesting as the early triassic was really an open ended time. if things had been slightly different dinosaurs would not have become the dominant life forms
I know it's fascinating isn't it! In some ways, the Triassic parallels the Paleocene and Eocene of the Cenozoic : an explosion of diversity in forms that were once small and marginal.
Not really
@@alcyon7536 I mean have you seen some of the early crocs
The Dark Master The Dark Master dinosaurs were kinda destined
@@alcyon7536 nothing in life is my friend
Ah yes, the Aphanosaurs, such strange beasts that are quite important in terms of their phylogenetic positions. Nice job with the video!
Glad you enjoyed it!
You deserve SO MANY MORE subscribers, Dr. Polaris! I'll be sure to share some of your videos. I love yours because you include great art with even greater explanations and easy to read charts and graphs. Keep doing what you do! I'm a huge fan.
I'm honoured! Thank you for your support.
@@dr.polaris6423 Of course! Keep doing what you do best! :)
Please keep producing the Triassic fauna videos, very informative and well executed.
You cad! A gentleman never discusses a dinosaur's ankles!
Am I the only one who finds it weird that crocodilians are “fake crocodiles”? I mean, yes, that’s just how taxonomic naming works, but still.
This is only true if you only consider monophyletic groupings, you could say Crocadilia is a different group that decended from fake crocs when you consider paraphyletic groupings... no system is perfect
Nice video!
I hope you to se more triassic fauna videos, they are very interesting. Also, I have one question:
Was there any group of reptiles(except dinosaurs), that were warm-blooded in triassic?
Thanks, I will definitely be covering more Triassic Archosaurs!
As for warmblooded Triassic Archosaurs, I don’t think there is definitive proof but it is assumed that they had elevated metabolisms due to phylogenetic bracketing.
@@dr.polaris6423 it is very interesting to me how it is turning out that many of these "slow, prehistoric reptiles" actually were complex and active animals, just like ones that inhabit planet today. Not only dinosaurs, but all prehistoric reptiles.
@@oposum244 Yeah it's very interesting isn't it! Something important happened early in the evolutionary history of Archosaurs and their relatives: elevated metabolisms.
I. Love. This. Channel. Must. Feed. Algorithm.
Thanks a lot for sharing this video, containing good understandable detail regarding the subjects! Greetings from Dortmund, Germany
Critically undersubscribed channel
So will you be doing an update on this video in the future?
10:12 Hey, I studied Bio & German at Uni Tübingen; highly recommend taking a gander at their Paleo exhibits it was worth applying there.
Fine work.Could you write out the names of these genera/species in the video? Your English pronunciation is truly exacting, it is just that scientific name spelling is haphazard.
I watch your videos with great interest because they are a fountain of information. Keep it flowing!!
I just like to hear you pronounce all those scientific words .
🤘🤘🤘
2:25 what are those pterosaurs
It's looks like human walk cycle.
Your channel is way to under-subscribed. Are you setting tags on the videos?
Dr. Polaris,
How does Effigia or Shuvosaurus okeeffeae connect to Aphanosauria?
There are very few pictures of Aphanosaurs online and these were placed there to fill in the gaps.
2:33 That just doesn't look right. I know the art is based off of fossil material, but the fossils for this odd creature (Nyctosaurus) are not complete. I'd bet anything that strange headcrest was holding up a sail in life. We see something similar in species like Tupandactylus imperator and Tapejara wellnoferi. I cannot believe those strange poles sticking out the top and back of its skull didn't have a sail. It makes total sense that the thin sail made mostly of skin didn't fossilize, while the 'scaffolding' did. The head sail is inferred in the bones. The rigging is there; they MUST have been the stabilizing force of some structure. The aerodynamics of a sail vs poles on an aircraft are so vastly different, night and day doesn't even come close to describing it.
This is just speculation now, but I can easily see this creature gliding at a low elevation just above the water of an ocean. I suspect the theorized head-sail would've assisted in stabilizing the pterosaur while flying in the 'ground effect' experienced just above the water's surface, or aiding flight in some way relating to the reptile's tendency to ride the wind associated with coastal waves. The ground effect is evidently taken advantage of by modern sea birds; I doubt it's the first time flying animals have utilized the phenomena.
The most outlandish and counter-intuitive animal parts are those related to the creature's need to visually signal to mates and rivals. The desire can drive evolution so thoroughly that eventually the derived part is more of a detriment for the creature to have than any sort of practical benefit. But as long as the showpiece animal part, such as a peacock's tailfeathers, effectively serves the purpose of helping pass genes down the line, then evolution will continue to drive in that direction. It is the only other suitable reason why an animal might evolve poles to stick out of its head, and I just don't think it's correct. My gut says a headcrest would evolve in some other sort of way before it got to long poles of bone extending from the skull. Why evolve a part intended to signal reproductive virility that is going to be so incompatible with your behavior? When you could, in theory, just as easily evolve one that doesn't interfere with what you do, like fly. And might even help with it! Evolution works WITH the body plan, it doesn't actively push against it.
If the creature evolved the excessive structure on their skull to hold up a sail, then I think it is no coincidence. The bones are trying to tell us. Everything it needed to hold up a sail is there, so why would it have not had one? Why spend the resources to grow an elaborate body part, especially one that makes you Less aerodynamic as a flyer, if it's not going to help you survive and reproduce in some way? The bony headcrest WAS helping - by supporting a membrane in-between that made the animal More aerodynamic. Essentially, a headcrest holding up a sail makes you a better flyer, while the same headcrest without the layer of membrane stretched over it would make you a poorer flyer.
It had a sail. It MUST have had a sail. The bones! Listen to the bones! They're screaming!
i fell alseep
Funny thing is didnt they had birds back then. so how does that work. Flight feathers beaks and all? Yet birds are descendants from dinosaurs? Some thing is not right am I missing some thing,,
Nope, not in the Triassic. Only very early Non-Avian Dinosaurs. The group to which birds belong, Avialae, originated in the Mid to Late Jurassic period.
@@dr.polaris6423 thank you, I thought I saw where they had found a modern type bird back then. Wasn't sure exact time period I bet I am just confusing things I have read in the past. I thought they had found one in amber but I read so much its hard to keep things separated and accurate with out checking over things but I can't remember where it was I read it.. so I thought I will ask some one who knows. Thanks again
@@dr.polaris6423 yeah found it it was the wonder chicken. 66mil years ago. Now that tells me if we found one like that from that far back, I bet you we will find more and even older. I doubt it just some how popped up all flight feathers beak and modern. I love these old finds and the difference in the life back then. Its nothing short of amazing
@@vikingskuld The Triassic period was 252-200 million years ago. True feathers were probably found around 160-180 million years ago, with more primitive filaments a quills existing even earlier than that.
@@timeshark8727 thanks yeah I live in Indiana so most of the fossil I look for and find around here are way earlier ocen life. So not as cool in some ways but almost alien in others. Seen lots of trilobite pieces and parts. Not as familiar with the later periods. So just really getting into them. Thanks again and I appreciate the quality of your video.
Little wonder these animals died out, regardless of climate change they could never have competed with early therapod dinosaurs.
Agreed.
Being a flat-footed, walking, carnivore doesn’t make for a promising future.