UPDATE: The discovery of a new species of European sebecid named Dentaneosuchus has recently been announced. It lived about forty million years ago during the Middle Eocene and was about the same size as Barinasuchus!
I really appreciate having a paleo channel that gives long overdue attention to Pseudosuchia. I've learned so much and I find it incredible that before seeing your (original upload) video on _Barinasuchus,_ I had no idea 6 meter, 1500kg crocodile cousins stalked the _Llanos_ and _Cerrado_ into the middle of the Miocene. I can't understand why not one other paleo channel (except Dr Polaris) or documentary I have watched in the last thirty years has found that worth mentioning.
Island South America was a really wild place. It puts Australia to shame in its weirdness, and can go toe to toe with any other continent in its level of danger.
@@aceundead4750 the running theory in how terror birds hunted is that they lunge at a smaller prey and trap them under their feet and just peck it to death. This is based on it's paleobiology and it does sound terrifying
Imagine these things still running around today. This why I love life before/after dinosaurs and why I mostly tell kids about those moments when I work at the museum.
wild how little i knew about all the various land crocs before this channel and some others. You'd think people would talk about these weird and wonderful boys more.
Very informative. I knew that the crocodilians were more diverse than most people knew ( ie "bear croc, "boar croc", etc.). But I had no idea that sebecids even existed and survived well into the Cenozoic. Keep up the great work.
I like to think that the Sebecids aren't just the successors of the dinosaurs, but also from the Baurusuchids as well, with both taking the niche of a medium to large size predator in an isolated continent (almost for the Baurusuchids). The Sebecosuchia is such an interesting group, and I'm glad we have content like yours talking about these creatures. Great video as always, keep up with the amazing work !
Fun fact : the cuban crocodile/rhombifer had part of a kind of a same behaviour in the past. It is inferred that they took out of the water so to chase the giant sloths. When these mammals got extinct then the rhombifer returned to some aquatic lifestyle but kept a good ability on land though.
I love your paleochannel and am a huge fan! Channels like this that talk about the more obscure dinosaur/non-dinosaurs are my favorite since it gives the lime light to equally fascinating organisms that put the worlds of prehistory into context. Thank you so much for what you do truly.
It’s funny that you mentioned sebecidae being the successors to dinosaurs because they are actually related to them because they are both part of a group called archosaurs, a clade of diapsids which includes non- avian dinosaurs, pterosaurs, and extinct relatives of crocodilians like the sebecidae, the only surviving members of archosaurs are crocodiles and birds and since birds are dinosaurs that means they are cousins to the crocodiles and since terror birds count as dinosaurs that live along side sebecidaes like Barinasuchus, then that means they’re also cousins.
I learn something new from every video on this channel. In school I never heard of land crocs, though they were well-known to science when I was a student.
Ack this is why I love your content much! I had never heard of these beauties before but thanks to you I find myself lost in reading about them, and they're quickly becoming one of mt most favorite extinct generea!
I wonder if anyone’s investigated their lip structure, given the current interest in whether Therapods have lips Sebecids seem an interesting group to study. Since the big arguments For seem to be that most terrestrial animals need their dentition moist with saliva, and the Against argument by Thomas Carr focusing on Daspletosarurus facial features being similar to modern crocs. In theory they would be the next best group to study outside of Therapoda themselves
The ‘teeth drying out’ argument isn’t really valid anymore and has been disproven by the West African crocodile, which can spend months hibernating in dry burrows, no where near a source of water, and their teeth are completely fine. I think restoring Sebecids with lips is a bit ridiculous. I mean most theropods probably didn’t have lips anyway. The whole lipped theropod idea comes from paloeart trends rather than actual fossil evidence
Pre-Great American Interchange South America was basically Triassic Redux with archosaurs (birds and crocodilians) being the dominant land carnivores there, except the dicynodont and prosauropod roles were replaced by herbivorous Xenarthran and Meridiungulate, and cynodont roles were filled by sparassodont
@@thedoruk6324 in what way do they lose to any competitors? Sharks have outlived all the marine reptiles and the most powerful marine mammals. Sharks are also still super diverse occupying all sorts of ecological niches.
@@thedoruk6324 well thats true but i wouldnt hold that against sharks. The ability to get oxygen fron the air is a massive advantage when tetrapods return to the ocean. They arent limited by the poor oxygen in the ocean which means they can develop larger brains and be very active. Sharks still do well despite the limitation.
I've learned several things from this. This is awesome! I actually have never heard of the Sebecidae, but I have heard of terrestrial crocodiles before like Quikana. So, yeah, sub earned! I like seeing stuff like this get attention.
Wow, great analysis of the new prehistoric reptilian creatures of the Cenozoic Era. So Mammals were not the only animals that ruled the Cenozoic Era but Big Birds and other big reptiles were there as well which are pretty cool and I definitely enjoy it because I adore reptiles and dinosaurs as well, looks like the large reptilian creatures are having a fun time in the Cenozoic Era after the Mesozoic Era. Thank you very much for this and I definitely appreciate the work you did.
So we have... - gigantic running crocodile-like creatures - in South America - living after the Age of Dinosaurs - where they were the largest predatory lifeform - while early hominids started to appear in the Old World South America really IS Lustria from Warhammrr, isn't it?
I heard the rumors of late surviving dinosaurs. Had no idea about the teeth being seen as evidence. Thanks for another croc packed video! Really interesting that some sebesucids evolved to be semi aquatic, its really the reverse of things like Quinkana! And thanks for covering barinasuchus again, i never tire of hearing about that absolute dragon of the cenozoic.
The history of land predators in Cenozoic South America is a strange one. For one, the fact that there were no real large land mammal predators until the hyperspecialized Thylacosmilus (deserves its own video) in the late Miocene, and even that wasn't much bigger than a large wolf or leopard; and it apparently went extinct in the Pliocene, supposedly long before large carnivorans made it to SA in the Pleistocene (but after the Great Interchange began). So why did it go extinct? Could be global cooling, or perhaps the first smaller carnivorans to arrive in the Pliocene ~5mya introduced some novel disease like distemper or scabies, or a combo? Why didn't it evolve larger? Some life-history feature of metatherians that prevent them from becoming larger carnivores, perhaps if they were relatively precocial & had to survive independently early? Competition from phorusrhacids/sebecids? Didn't stop large mammalian carnivores from evolving elsewhere... Secondly, the question of what happened to the Sebecids is probably due to global climate change, not local; the Andes had been high mountains for many 10s of millions of years, and we know globally climate sharply deteriorated after 13-10 mya (e.g. 10.1038/ngeo2813, other papers). The fact though that Purussaurus persisted into the latest Miocene is possibly because all the appropriate lowland sebecid habitat in the warm tropics was essentially swamp by the end Miocene, and prowled by Purussaurus. Or we just don't have the fossils of remnant Sebecidae. Finally, what role did the terror birds play in structuring animal communities? Did they actually tackle large prey, perhaps by attrition wounding? Or stick to prey smaller than themselves, like flying accipiters generally do? Did the largest SA mammals have any predators at all from birth to death, outside of the Amazon swamps, after the sebecids? Phorusrhacids too went extinct by end-Pliocene, despite being perhaps the only remaining large predators in SA. Especially by the Pliocene, and definitely by the Pleistocene if we believe large carnivorans didn't arrive until ~1mya, there seems to be a total absence of large predators in SA for at least a million years.
I would like to add that members of a sparassodont clade called Proborhyaenidae grew much larger than Thylacosmilus. Estimates of their size are as high as 150 kilograms, the same as a large female black bear. They also lived before the sebecids died out. While able to compete and perhaps outclass the likes Sebecus, or Langstonia they still had no chance of scaring off a species like Barinasuchus.
Some procyonids apparently arrived to South America roughly 7 million years ago likely through island hopping and some even managed to attain megafaunal size that could potentially competed with local sparassodonts Although there's no evidence that suggested that this early carnivora invaders might be responsible fot their extinction though
They would have been like black bears and grizzly bears roaming around forest chasing after deer and other land animals and killing hunters or people visiting national parks.
@@crossroads8370 I imagine they would be absolutely terrifying but awe inspiring to witness. If you ever watch a large alligator or crocodile high walk it’s impressive how massive they are. I could only imagine something that big walking with complete confidence that it’s an apex predator. Definitely would watch from a distance I’m sure it would shake you to the core to be ran down by one of them.
@@chimerasuchus Thank you, now I've gone back and watched your Chimaerasuchus video (both versions) I'm impressed. I always imagined the Crocodylomorpha were all much like Crocodilia except for some being more terrestrial.
Between these guys and the Terror Birds it really seems like the South American archosaurs decided to form a Mesozoic tribute act during the so-called Age of Mammals...
Fantastic vid as always. Question for you: Do you think that Sebecidae really was taxonomically limited to just those large forms by the end of their lineage? What I mean is, that could just be the impression that preservation bias is giving us. Large animals preserve better than small ones, and SA's fossil record is only recently becoming as deeply explored as northern continents, with a great many discoveries yet to come, I'd wager. I don't see any reason why there couldn't have been smaller sebecids running around filling mesopredator niches. To borrow an example from your video, while some of Australia's top predator roles were filled by Megalania and Komodo dragons, perenties were still a thing.
Fun question to think of: would this class of crocodiliomorph have lips? Compared to modern crocodilians that rely on staying in water to hydrate their mouth/teeth, would these animals need lips to cover their teeth in “correct” was of artistically recreating them?
The one with Langstonia is the toxodont Huilatherium. The creatures in the images with Barinasuchus are both astrapotheres. The astrapothere is the image by Julio Lacerda is Hilarcotherium and the one by HodariNundu is Granastrapotherium. Just like the sebecids, the native mammalian fauna of prehistoric South America was very strange.
@@chimerasuchus I knew about meridiungulates but I guess they’re drawing them a bit different now. I didn’t know granastrapotherium and that it was so similar to early proboscideans. Thanks that’s good stuff.
These were cold-blooded crocodilian reptiles. The majority of dinosaurs were feathered and warm-blooded, making birds the successors instead. "Ecologically closer" is not an accepted factor in Taxonomy.
It's funny how when dinosaurs where discovered people thought they were giant terrestrial cocodrilian like iguanas, only to later on discover that we where off by just a couple million years.
It would only take for the planet to warm up just as it did in the creatacous and these guys could've became something truly terrifying. Something equal to the theropod dinosaurs or surpass them
This is going to be an unpopular opinion BUT the sebecids remind me more of the pseudosuchians that became the dominate land animals in the Triassic more than they do of true dinosaurs. There is strong evidence that Dinos were indeed warm blood, their posture, much like land mammals today was upright rather than the default sprawling gait we see in modern reptiles, dinos had the ability to produce feathers, lacked osteoderms (with some VERY notable exceptions, hello ankylosaurs!) their growth rates were little short of explosive and seemed to have developed a work-around to the turbinate bones endothermic animals need for heat regulation. It irks me when people lump in the pterosaurs and dinosaurs with modern day reptiles like lizards and tend to think of dinosaurs/pterosaurs as some form of jumped-up Komodo Dragon or Nile crocodile rather than what it truly was. I believe a better comparison to non-avian dinosaurs (in looks, appearance and behavior) are modern flightless birds such as emus, rheas, ostriches, the Red-legged Seriema, the terror birds of centuries long pass ( the Phorusrhacos) and the Cassowary. LIFE is precious, which is why I dabble in Paleontology and, in my opinion, past organisms were better adapted that what we give them credit for. More often than not, entire groups of animals became extinct not because something "better" came along but because of either a major catastrophe or the climate shifting bit and the rules for life on Earth changed. However, I'm an amateur, so feel free to correct me......
But tyrannosaurids did not have serrated blade like teeth, they have more conical, bone crushing teeth. Cacharadontosaurids like Giganotosaurus had serrated blade like teeth
i highly doubt their teeth where that exposed tho, as they werent aquatic, or at least regarding the ones that werent. We already remade the dinosaurs models to fit this fact, and although it makes them look a lot like crocodilians to have the snaggletooth aesthetic, i think it should be applied to them too.
So why didn't the Sebecidae (like the non-avian dinosaurs) get wiped out by the K-T extinction event? According to Wikipedia (en.wikipedia.org/wiki/Cretaceous%E2%80%93Paleogene_extinction_event) "With the exception of some ectothermic species such as sea turtles and crocodilians, no tetrapods weighing more than 25 kilograms survived". And having survived, why did they subsequently go extinct?
It seems that only smaller species survived, assuming there even were any large ones during the Mesozoic. Also, the sebecids were ectothermic, is not to the same degree as crocodilians. Also, plenty of other clades that survived past the end of the Cretaceous Period, such as the choristoderans, multituberculates, and the dyrosaurids (another clade of crocodylomorphs), also died out between the 66 million years between then and now. The reasons the sebecids went extinct were discussed in the video.
The rest of the world : Dog and Cat-like placental superpredators South America : What about Terror Birds, Crocodylomorphs and Metatherian superpredators ?
Australia was pretty weird as well. It was home to numerous strange marsupials, lands crocs such as Quinkana, gigantic monitor lizards like megalania, and even the terror bird-like dromornithids (although they may have been herbivores).
@@chimerasuchus I can't find the image unfortunately. What website did you find the image in, and what was the name of the piece? I went to the guy's tumblr but it's not there, and neither can i find it in any search engines.
@@matthewbadger8685 I can't find the original now either. The only place I can find a high quality version is a post in the subreddit Nature Was Metal.
@@chimerasuchus You have my genuine thanks for recommending me a place where you can find the image, and for introducing me to it in the first place. Additionally, i found this video to be extremely intriguing; I had not expected there to be another reptile that I liked as much as postosuchus.
screw that episode of Walking with Beast, we need a prehistoric documentary or other paleo project that takes place in South Amarica back when it was an island continent.
An informative video! A few constructive criticisms: 1. Especially, not "expecially" 2. The ending "dae" is pronounced "dee" not "day". Other than that, cool information. Thanks for sharing!
Great info - thanks a lot for creating and sharing this content! BTW it took me a moment to understand that by "deep skull" you meant "high skull" - or am I still not getting it?
UPDATE: The discovery of a new species of European sebecid named Dentaneosuchus has recently been announced. It lived about forty million years ago during the Middle Eocene and was about the same size as Barinasuchus!
Pog
I wonder if that means sebecids originated in Europe, and a few small genera rafted over to South America, and diversified there.
South America, where the age of Reptiles never ended at the KT boundary. Terror Birds and the sebecids. Bad time to be a mammal.
there should be a paleo documentary that takes place there.
It was so bad that some mammals decided to copy Ankylosaurs defense mechanism and become biological tank themselves
It was basically permain 2 reptilian boogaloo
Also Australia.
lots of isolated southern hemisphere spots. unfortunately ornithischians and sauropods and whatnot all went extinct
I thought it was weird that crocodiles survived the extinction but never seemed to take over as apex predator....this actually makes sense.
I really appreciate having a paleo channel that gives long overdue attention to Pseudosuchia. I've learned so much and I find it incredible that before seeing your (original upload) video on _Barinasuchus,_ I had no idea 6 meter, 1500kg crocodile cousins stalked the _Llanos_ and _Cerrado_ into the middle of the Miocene.
I can't understand why not one other paleo channel (except Dr Polaris) or documentary I have watched in the last thirty years has found that worth mentioning.
Agree. This was all new to me. Great informative video with super illustrations.
..
No you don’t
lol coincidentally dr polaris releases Sebecosuchians 11 days after
A
Island South America was a really wild place. It puts Australia to shame in its weirdness, and can go toe to toe with any other continent in its level of danger.
there should be a massive paleo project all about island South America.
To add to your point South America turned birds back into dinosaurs with the advent of the terror birds
@@aceundead4750 the running theory in how terror birds hunted is that they lunge at a smaller prey and trap them under their feet and just peck it to death. This is based on it's paleobiology and it does sound terrifying
@@SevenPr1me i wonder how they tasted
@@aceundead4750 well
Probably like chicken
I absolutely learned something today. I'm a palaeontologist in-training myself and genuninely didn't know about these animals. Utterly fascinating.
if you're a paleontologist then I encourage you and others to go to South America to uncover more creature's form the former island continent.
Imagine these things still running around today. This why I love life before/after dinosaurs and why I mostly tell kids about those moments when I work at the museum.
in this terrible wrong world? impossible, something like bolsonaro had already extinct them
Back in my day we had to battle sebecidae on our way to stone school
@@SevenPr1me 😹😹😹😹😹
they’d still go extinct bc of us
Something like that has been seen in Democratic Republic of the Congo
wild how little i knew about all the various land crocs before this channel and some others. You'd think people would talk about these weird and wonderful boys more.
Very informative. I knew that the crocodilians were more diverse than most people knew ( ie "bear croc, "boar croc", etc.). But I had no idea that sebecids even existed and survived well into the Cenozoic. Keep up the great work.
I like to think that the Sebecids aren't just the successors of the dinosaurs, but also from the Baurusuchids as well, with both taking the niche of a medium to large size predator in an isolated continent (almost for the Baurusuchids). The Sebecosuchia is such an interesting group, and I'm glad we have content like yours talking about these creatures. Great video as always, keep up with the amazing work !
Id argue that terror birds were the successors.
Great video! Sebeciades are extremely underrated.
Fun fact : the cuban crocodile/rhombifer had part of a kind of a same behaviour in the past. It is inferred that they took out of the water so to chase the giant sloths. When these mammals got extinct then the rhombifer returned to some aquatic lifestyle but kept a good ability on land though.
I love your paleochannel and am a huge fan! Channels like this that talk about the more obscure dinosaur/non-dinosaurs are my favorite since it gives the lime light to equally fascinating organisms that put the worlds of prehistory into context. Thank you so much for what you do truly.
Eyyyy I follow you on Instagram!
sebecids: "PARTY LIKE IT'S THE TRIASSIC, BABY"
This is an entirely new post Dinosaur story for me. I’m
Fascinated how they survived the KPG.
Everything in this video is completly new to me and I really like it. I appreciate your research.
Never heard of these before. Fascinating.
It’s funny that you mentioned sebecidae being the successors to dinosaurs because they are actually related to them because they are both part of a group called archosaurs, a clade of diapsids which includes non- avian dinosaurs, pterosaurs, and extinct relatives of crocodilians like the sebecidae, the only surviving members of archosaurs are crocodiles and birds and since birds are dinosaurs that means they are cousins to the crocodiles and since terror birds count as dinosaurs that live along side sebecidaes like Barinasuchus, then that means they’re also cousins.
I learn something new from every video on this channel. In school I never heard of land crocs, though they were well-known to science when I was a student.
If they mentioned stuff like this more, kids would probably be more interested in their work in general.
Ack this is why I love your content much! I had never heard of these beauties before but thanks to you I find myself lost in reading about them, and they're quickly becoming one of mt most favorite extinct generea!
the sebecids are such an underrated group of prehistoric animals.
hopes that they would appear in more media in the future.
I wonder if anyone’s investigated their lip structure, given the current interest in whether Therapods have lips Sebecids seem an interesting group to study.
Since the big arguments For seem to be that most terrestrial animals need their dentition moist with saliva, and the Against argument by Thomas Carr focusing on Daspletosarurus facial features being similar to modern crocs. In theory they would be the next best group to study outside of Therapoda themselves
The ‘teeth drying out’ argument isn’t really valid anymore and has been disproven by the West African crocodile, which can spend months hibernating in dry burrows, no where near a source of water, and their teeth are completely fine. I think restoring Sebecids with lips is a bit ridiculous. I mean most theropods probably didn’t have lips anyway. The whole lipped theropod idea comes from paloeart trends rather than actual fossil evidence
Pre-Great American Interchange South America was basically Triassic Redux with archosaurs (birds and crocodilians) being the dominant land carnivores there, except the dicynodont and prosauropod roles were replaced by herbivorous Xenarthran and Meridiungulate, and cynodont roles were filled by sparassodont
I really hope that they're going to be a big paleo project about Cenozoic South America back when it was an island continent.
Is also a good thing that the continents had split apart, imagine a world where the archosaurs became worldwide again, we probably wouldnt even exist.
I consider myself fairly educated in paleontology as a nonprofessional, but I've never heard of sebecidae. Thanks a lot for the video!
Summary: Crocodylimorpha always rules! Regardless of age or era or period. Crocodylimorpha are the epitome of Epicness
True, only the sharks are able to rival them for pure survivability.
@@chrisdonish sharks kinda loose bad to almost every competitor thought like literally from cretaceous to modern era
@@thedoruk6324 in what way do they lose to any competitors? Sharks have outlived all the marine reptiles and the most powerful marine mammals. Sharks are also still super diverse occupying all sorts of ecological niches.
@@chrisdonish The Apex position simply
@@thedoruk6324 well thats true but i wouldnt hold that against sharks. The ability to get oxygen fron the air is a massive advantage when tetrapods return to the ocean. They arent limited by the poor oxygen in the ocean which means they can develop larger brains and be very active. Sharks still do well despite the limitation.
I've learned several things from this. This is awesome! I actually have never heard of the Sebecidae, but I have heard of terrestrial crocodiles before like Quikana. So, yeah, sub earned! I like seeing stuff like this get attention.
This was incredibly well put together and very informative; as well as entertaining! Thank you for sharing. Subscriber earned 🤟🏾🖤
I'm surprised that Barinasuchus was not an endotherm, you'd think such a large presumably active apex terrestrial predator would be endothermic
Notosuchians were suspected to be endothermic before their bone histology was actually examined about two years ago.
Monitor lizards are ectothermic and they are very active predators.
@@Polosatiy_Varan That's true but no Monitor Lizards even come close to the size of Barinasuchus
@@Dell-ol6hb Megalania?
Very interesting!!! I read and watch alot about natural history but this is a subject matter I'd never heard of before. Thanks for posting this!!!!
They look like some of the predators from the early Triassic period. That Crocodile-type body style just seems to work.
Wow, great analysis of the new prehistoric reptilian creatures of the Cenozoic Era.
So Mammals were not the only animals that ruled the Cenozoic Era but Big Birds and other big reptiles were there as well which are pretty cool and I definitely enjoy it because I adore reptiles and dinosaurs as well, looks like the large reptilian creatures are having a fun time in the Cenozoic Era after the Mesozoic Era.
Thank you very much for this and I definitely appreciate the work you did.
"Successors of the Dinosaurs"
Terror birds: Are we a joke to you?
So we have...
- gigantic running crocodile-like creatures
- in South America
- living after the Age of Dinosaurs
- where they were the largest predatory lifeform
- while early hominids started to appear in the Old World
South America really IS Lustria from Warhammrr, isn't it?
Look at these fascinating reptiles The way I look at them they are the last remnants from a bygone era But it's fascinating to learn much about them
hopes that they appear in more media in the future.
So glad there's a transcript so I don't have to go through the nightmare of trying to spell all these complex names and words!
I heard the rumors of late surviving dinosaurs. Had no idea about the teeth being seen as evidence. Thanks for another croc packed video! Really interesting that some sebesucids evolved to be semi aquatic, its really the reverse of things like Quinkana! And thanks for covering barinasuchus again, i never tire of hearing about that absolute dragon of the cenozoic.
😊
To be fair, birds are a surviving dinosaur lineage too
I love your channel! You have a skill for presenting information in a logical and engaging way.
very interesting video I have heard of quite a few extinct animals but i never heard of Sebecidae. I'm glad you posted this video.
I love these underrated running crocs
hopes that they appear in more media in the future.
Great presentation. Informative and interesting.
Thank you. I am glad you enjoyed it.
Crocodilians, lizards, snakes and avian therapods are still my favorites! A very good video!
Always love prehistoric crocodilians especially the ones that lived after the dinosaurs.
The history of land predators in Cenozoic South America is a strange one. For one, the fact that there were no real large land mammal predators until the hyperspecialized Thylacosmilus (deserves its own video) in the late Miocene, and even that wasn't much bigger than a large wolf or leopard; and it apparently went extinct in the Pliocene, supposedly long before large carnivorans made it to SA in the Pleistocene (but after the Great Interchange began). So why did it go extinct? Could be global cooling, or perhaps the first smaller carnivorans to arrive in the Pliocene ~5mya introduced some novel disease like distemper or scabies, or a combo? Why didn't it evolve larger? Some life-history feature of metatherians that prevent them from becoming larger carnivores, perhaps if they were relatively precocial & had to survive independently early? Competition from phorusrhacids/sebecids? Didn't stop large mammalian carnivores from evolving elsewhere...
Secondly, the question of what happened to the Sebecids is probably due to global climate change, not local; the Andes had been high mountains for many 10s of millions of years, and we know globally climate sharply deteriorated after 13-10 mya (e.g. 10.1038/ngeo2813, other papers). The fact though that Purussaurus persisted into the latest Miocene is possibly because all the appropriate lowland sebecid habitat in the warm tropics was essentially swamp by the end Miocene, and prowled by Purussaurus. Or we just don't have the fossils of remnant Sebecidae.
Finally, what role did the terror birds play in structuring animal communities? Did they actually tackle large prey, perhaps by attrition wounding? Or stick to prey smaller than themselves, like flying accipiters generally do? Did the largest SA mammals have any predators at all from birth to death, outside of the Amazon swamps, after the sebecids? Phorusrhacids too went extinct by end-Pliocene, despite being perhaps the only remaining large predators in SA. Especially by the Pliocene, and definitely by the Pleistocene if we believe large carnivorans didn't arrive until ~1mya, there seems to be a total absence of large predators in SA for at least a million years.
I would like to add that members of a sparassodont clade called Proborhyaenidae grew much larger than Thylacosmilus. Estimates of their size are as high as 150 kilograms, the same as a large female black bear. They also lived before the sebecids died out. While able to compete and perhaps outclass the likes Sebecus, or Langstonia they still had no chance of scaring off a species like Barinasuchus.
@@chimerasuchus Huh I did not know, missed that when I was reading wikipedia's entries on sparassodonts lol
Some procyonids apparently arrived to South America roughly 7 million years ago likely through island hopping and some even managed to attain megafaunal size that could potentially competed with local sparassodonts
Although there's no evidence that suggested that this early carnivora invaders might be responsible fot their extinction though
Sebecids were the last line of the vast diversity of pseudosuchia. After they were gone, all we were left with is the "unchanging" crocodilians
I wish they could have survived to modern times it would have been amazing to see them and study them in life
They would have been like black bears and grizzly bears roaming around forest chasing after deer and other land animals and killing hunters or people visiting national parks.
@@crossroads8370 I imagine they would be absolutely terrifying but awe inspiring to witness. If you ever watch a large alligator or crocodile high walk it’s impressive how massive they are. I could only imagine something that big walking with complete confidence that it’s an apex predator. Definitely would watch from a distance I’m sure it would shake you to the core to be ran down by one of them.
The Sebecids in the thumbnail looked like they'd getting high lol
Thanks for making these videos!
What's the nodosuchian at 1:28 with the therapsid-like toolkit of teeth? And did it have a mobile jaw like ours?
It is Chimaerasuchus (the namesake of the channel), and it is thought to have been capable of chewing much like in mammals.
@@chimerasuchus Thank you, now I've gone back and watched your Chimaerasuchus video (both versions) I'm impressed. I always imagined the Crocodylomorpha were all much like Crocodilia except for some being more terrestrial.
Ooo so cool to learn about them, thank you for making this video!!
Now I love the Sebeicade cause they're so awesome, also this video was so great
How interesting! They look like something from the late Permian or early Triassic.
Great stuff G thanks for sharing
I really wish the sebecidae we're still around, their so cool looking, and the smaller would ones would be cute pets
Just, no.
crocodillian will be enough dude lol
Between these guys and the Terror Birds it really seems like the South American archosaurs decided to form a Mesozoic tribute act during the so-called Age of Mammals...
Oh yeah, I have found a new favorite era
1:47 this is the cutest thing i've ever seen in my life
Brilliant video, you've gained a subscriber
Friend, this investigation was epic 😎👌
The crocodile lineage of nature is fucking awesome. They just kept coming back. I like them way more than dinosaurs. Hail Deinosuchus.
Both you and Dr. Polaris doing videos on sebecids? Man, I’m in for a treat…
The early cenozoic had some interesting top predators who were reptiles.
The later Cenozoic as well. Ice Age Australia was home to megalania and the land croc Quinkana.
@@chimerasuchus true
Yes. Not forgot the Titanoboa. ^^
@@Paka1918 Yep ^^ & the terror birds too ^^
@@SuperCretaceousMZ
Yes, but later than Titanoboa. This giant snake lived in Palaeocene era in very hot rainforests. ^^
Fantastic vid as always.
Question for you: Do you think that Sebecidae really was taxonomically limited to just those large forms by the end of their lineage?
What I mean is, that could just be the impression that preservation bias is giving us. Large animals preserve better than small ones, and SA's fossil record is only recently becoming as deeply explored as northern continents, with a great many discoveries yet to come, I'd wager. I don't see any reason why there couldn't have been smaller sebecids running around filling mesopredator niches. To borrow an example from your video, while some of Australia's top predator roles were filled by Megalania and Komodo dragons, perenties were still a thing.
That is a good point. The sebecid fossils which are known from the later half of the Cenozoic are rare and incomplete.
KMD was not aussie
@@Rryan8065 A little over a decade ago, it was found that the Komodo Dragan first evolved in Australia and only later spread.
Bro I watch prehistoric stories as a kid everyday it was so fun
Fun question to think of: would this class of crocodiliomorph have lips? Compared to modern crocodilians that rely on staying in water to hydrate their mouth/teeth, would these animals need lips to cover their teeth in “correct” was of artistically recreating them?
What is being hunted/eaten at 0:45 , 1:04 and 6:27 ?
The one with Langstonia is the toxodont Huilatherium. The creatures in the images with Barinasuchus are both astrapotheres. The astrapothere is the image by Julio Lacerda is Hilarcotherium and the one by
HodariNundu is Granastrapotherium. Just like the sebecids, the native mammalian fauna of prehistoric South America was very strange.
@@chimerasuchus
I knew about meridiungulates but I guess they’re drawing them a bit different now. I didn’t know granastrapotherium and that it was so similar to early proboscideans. Thanks that’s good stuff.
what are those tapir-like animals with huge tusks the sebecids are hunting in this vid?
They are astrapotheres, a group of mammals that were native to South America.
nice, thanks
Wow almost 30k ! I'm here since 1k sub
These were cold-blooded crocodilian reptiles. The majority of dinosaurs were feathered and warm-blooded, making birds the successors instead. "Ecologically closer" is not an accepted factor in Taxonomy.
Such a cool diverse family of reptiles
I need to get my channel to this level. Nice job. Mike
loved this one too.., Sebecidae have great teeth and wickedly cool skulls
greetings bibia, kind wait for the next vid.
It's funny how when dinosaurs where discovered people thought they were giant terrestrial cocodrilian like iguanas, only to later on discover that we where off by just a couple million years.
Vừa vào đã nổi cả da gà 藍giọng a Phúc hayyy quá, mong sẽ tiếp tục cover ạ ❤
Sebecuss would be homothermic or mesothermic ?
It would only take for the planet to warm up just as it did in the creatacous and these guys could've became something truly terrifying. Something equal to the theropod
dinosaurs or surpass them
This is going to be an unpopular opinion BUT the sebecids remind me more of the pseudosuchians that became the dominate land animals in the Triassic more than they do of true dinosaurs. There is strong evidence that Dinos were indeed warm blood, their posture, much like land mammals today was upright rather than the default sprawling gait we see in modern reptiles, dinos had the ability to produce feathers, lacked osteoderms (with some VERY notable exceptions, hello ankylosaurs!) their growth rates were little short of explosive and seemed to have developed a work-around to the turbinate bones endothermic animals need for heat regulation. It irks me when people lump in the pterosaurs and dinosaurs with modern day reptiles like lizards and tend to think of dinosaurs/pterosaurs as some form of jumped-up Komodo Dragon or Nile crocodile rather than what it truly was.
I believe a better comparison to non-avian dinosaurs (in looks, appearance and behavior) are modern flightless birds such as emus, rheas, ostriches, the Red-legged Seriema, the terror birds of centuries long pass ( the Phorusrhacos) and the Cassowary.
LIFE is precious, which is why I dabble in Paleontology and, in my opinion, past organisms were better adapted that what we give them credit for. More often than not, entire groups of animals became extinct not because something "better" came along but because of either a major catastrophe or the climate shifting bit and the rules for life on Earth changed. However, I'm an amateur, so feel free to correct me......
Ótima dedução, parabéns.
Great video! Thank you.
But tyrannosaurids did not have serrated blade like teeth, they have more conical, bone crushing teeth. Cacharadontosaurids like Giganotosaurus had serrated blade like teeth
Was about to say this.
Their teeth were also serrated, just not as specialized for slicing through flesh as well as the carcharodontosaurids.
Thanks for sharing
i highly doubt their teeth where that exposed tho, as they werent aquatic, or at least regarding the ones that werent. We already remade the dinosaurs models to fit this fact, and although it makes them look a lot like crocodilians to have the snaggletooth aesthetic, i think it should be applied to them too.
Oh man, I actually really like that idea of depicting the brontosaurus with earth colored bodies and sky colored necks.
So why didn't the Sebecidae (like the non-avian dinosaurs) get wiped out by the K-T extinction event? According to Wikipedia (en.wikipedia.org/wiki/Cretaceous%E2%80%93Paleogene_extinction_event) "With the exception of some ectothermic species such as sea turtles and crocodilians, no tetrapods weighing more than 25 kilograms survived". And having survived, why did they subsequently go extinct?
It seems that only smaller species survived, assuming there even were any large ones during the Mesozoic. Also, the sebecids were ectothermic, is not to the same degree as crocodilians. Also, plenty of other clades that survived past the end of the Cretaceous Period, such as the choristoderans, multituberculates, and the dyrosaurids (another clade of crocodylomorphs), also died out between the 66 million years between then and now. The reasons the sebecids went extinct were discussed in the video.
Fascinating....
Great new paintings!
The rest of the world : Dog and Cat-like placental superpredators
South America : What about Terror Birds, Crocodylomorphs and Metatherian superpredators ?
Australia was pretty weird as well. It was home to numerous strange marsupials, lands crocs such as Quinkana, gigantic monitor lizards like megalania, and even the terror bird-like dromornithids (although they may have been herbivores).
I would call the terror birds the true continuation of the dinosaurs... Being as they really were avian dinosaurs.
OK, those things are just pure nightmare fuel. Thanks for that lol.
Love the illustration's
Subscribed : )
What's the source for the image at 0:46?
It is by Julio Lacerda. The artist credit can be seen on the lower left corner.
@@chimerasuchus I can't find the image unfortunately. What website did you find the image in, and what was the name of the piece? I went to the guy's tumblr but it's not there, and neither can i find it in any search engines.
@@matthewbadger8685 I can't find the original now either. The only place I can find a high quality version is a post in the subreddit Nature Was Metal.
@@chimerasuchus You have my genuine thanks for recommending me a place where you can find the image, and for introducing me to it in the first place. Additionally, i found this video to be extremely intriguing; I had not expected there to be another reptile that I liked as much as postosuchus.
Baurusuchia tem esse nome por causa de uma cidade chamada Bauru, que fica no estado de São Paulo no Brasil
Existe um canal de um paleontólogo do Brasil chamado Canal do Pirula, ele é especialista em Pseudosuchias
Imagine being teleported to the Jurassic... It would be like hell on an alien planet for modern humans. You'd not survive without weapons.
I subbed. Nice content
screw that episode of Walking with Beast, we need a prehistoric documentary or other paleo project that takes place in South Amarica back when it was an island continent.
An informative video! A few constructive criticisms:
1. Especially, not "expecially"
2. The ending "dae" is pronounced "dee" not "day".
Other than that, cool information. Thanks for sharing!
Earned a sub!
This was awesome!
really good video
Thank you.
Great info - thanks a lot for creating and sharing this content! BTW it took me a moment to understand that by "deep skull" you meant "high skull" - or am I still not getting it?
"High skull" might be the more correct term, but it is easier to be mistaken for the position of the skull rather than the shape of the skull itself.
@@chimerasuchus I see. Thanks for answering that!
Tall.
Nice video. I love crocs. Please do a video about Crocodylus Thorbjarnarsoni.
I actually already made a video about both it and the closely related Crocodylus anthropophagus.
@@chimerasuchus Nice. Keep it up. 👏👏👏👍
What could be the cause of sebecids extinction?