True Archosaurs and Early Pseudosuchians

True Archosaurs first appeared during the Early Triassic and soon went on to dominate terrestrial carnivorous niches over the course of the period. Two main lineages emerged: the Pseudosuchians and the Avemetatarsalians. The former can be defined as all Archosaurs closer to modern Crocodilians than to Dinosaurs or Pterosaurs. During the Triassic, the most basal Pseudosuchians were modestly sized, fully terrestrial carnivores capable of running on their hind legs.
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[@miguellilly8859]

imagine a bird that convergently evolved to take on the crocodile niche.

[@dr.polaris6423]

Now that would be a sight to see! I can imagine a large carnivorous penguin doing this.

[@hailgiratinathetruegod7564]

@@dr.polaris6423 man, the new Happy feet Sequel will be a weird movie

[@bri1085]

can endotherms take on that croc niche though?

[@miguellilly8859]

@@bri1085 Ambulocetus once held the take on the crocodile niche

[@bri1085]

@@miguellilly8859 was it really the crocodile niche or simply the body plan, orcas and sharks have similar body plans but fairly different niches

[@felipeantonio1304]

I love the whole crocodile-like creatures from the Triassic. Such fascinating convergent evolutionary traits.

[@peterolesen3567]

Thank you! it is so difficult to find information covering early non-dinosaurian archosaurs

[@dr.polaris6423]

My pleasure :)

[@TedShatner10]

Everything on the riverbank kept evolving into crocodile forms in the past 300 million years (alongside or before "true" crocodiles) in the same fashion the crab form keeps on emerging.

[@dr.polaris6423]

A body shape clearly very well suited to this environment!

[@TedShatner10]

@@dr.polaris6423 I can envision hippos having remote descendents/cousins becoming the next crocodiles in 50 million years time...

[@bri1085]

@@TedShatner10 Won't happen, the hippopotamus is already peak mammal.

[@TedShatner10]

@@bri1085 But they still got extant crocodiles in their very successful niche alongside them and the hippo body plan is still awkward in comparison (but suited as bear like omnivores).

[@dynamosaurusimperious6341]

*This Is A World* Wherr early crocs go bipdeal

[@scoobydicky9459]

Krampus.

[@caviramus0993]

Great vid! As a piece of advice, wawelski is pronounced vavelski, there is no "v" in Polish, its sound is taken by the "w" letter.

[@dr.polaris6423]

Thanks for letting me know!

[@scottmccrea1873]

Slavic words can be trough for English speakers.

[@xenoidaltu601]

Can you please talk about the possibility that perhaps all archosauriformes were most likely endothermic. The evidence is with how crocodiles potentially regressed to ectothermism but kept a two chambered heart. This is also not far fetched as Naked Mole Rats are the only ectothermic mammals. It would be awesome to know how animals "devolve" back to a cold blooded lifestyle.

[@sockmonkey6666]

Nitpick: you mean they kept a four-chambered heart.

[@thelaughinghyenas8465]

Thank you for the episode. This is interesting stuff!

[@papakarrbear3767]

Well see u next year, latter alligator

[@dr.polaris6423]

Haha I see what you did there.

[@carolynallisee2463]

Smok- now we know where Smaug's name originated!

[@dr.polaris6423]

Certainly sounds similar!

[@asmodai2025]

Smaug is the actual German word for smoke :D.

[@sylviancreedmarsh9171]

Dr. Polaris is a vital part of my day every day. Even the videos I’ve already seen 😍

[@darthjacobynum573]

This is the first video from you that I've watched and I really enjoyed it. I was looking for a triassic animal to draw for an instagram competition and was thinking about drawing postosuchus, but Smok Wawelski definately caught my attention, I might end up drawing it, thank you for this video!!!

[@NeroLobo]

Good vid. Happy to find this channel.

[@dr.polaris6423]

Thanks!

[@adamrainey4633]

Love the video! Keep it up!

[@dr.polaris6423]

Cheers ;)

[@passingwind2681]

Love your content

[@vassa1972]

Great stuff

[@cosmo6122]

I love this channel

[@MarkLatimerRussell]

So, you’re positing Smok is neither a crocodile-line nor bird-line archosaurs?

[@dr.polaris6423]

I could well be, until we can observe more complete remains.

[@user-ce6nz8ht3b]

please more of this pleaseee love it

[@alioramus1637]

I like your channel as a paleo-enthusiast. May i suggest gorgonopsids as a topic for perhaps a future video?

[@dr.polaris6423]

Good idea!

[@alioramus1637]

@@dr.polaris6423 That made my day! Thank you!

[@dazhonghuang5355]

Merry Christmas !

[@dr.polaris6423]

Thanks, you too!

[@reptilo7099]

Smok is one of my favorite Rauisuchids 💯🔥

[@jrodowens]

Looking forward to what I'm hoping very much will be a video each on rauisucians, poposaurids & crocodylomorphs - my three favorite Mesozoic lineages. But also hope for dinosauromorphs, pterosaurs, Triassic marine reptiles like placodonts, nothosaurs, early icthyosaurs (and more!) and all the other amazing Pangean creatures from metoposaurids to drepanosauramorphs to dicynodonts! By the way, if you tackle silesaurids I'd love to hear your take on them. I find the proposal recently (apologies to research authors for not citing you by name) that silesaurids possibly being basal ornithischians to be compelling - it would certainly account for much in the record, and makes good sense to this amateur enthusiast (in other words, I've not credibility.)

[@oleandreasjensen5263]

Thank you for sharing. Love to see and learn about these successfully animals that ruled in the Triassic period and in early Jura. Ia m shure that these animals also have been succseslful predators, and that they some places have lived mabe as long as into the creata period. - But we not discovered the fossils yet !!!

[@BigChap117]

Imagine if following an anthropocene extinction of mammals larger than a cat or dog, crocodilians evolved to mimic their more active archosaur ancestors to fill those niches. Part of me wishes these animals were still around to observe, fascinating for there to have been such active reptiles.

[@robyrcmp]

PLEASE!! turn up your recording volume levels!

[@Pyovali]

Hüwää contenttia yälleen kerran

[@mattimorottaja8445]

spiiik anglisch

[@anonb4632]

What Christmas? Christmas was banned but Black Friday wasn't.

[@dondragmer2412]

Christmas was never banned. I celebrated it every year and will continue to do so.

[@qui-gontimtherandomraptor1072]

This just reaffirms my theory that all Archosaurs exist on a spectrum from crocodile to bird XD

[@jimmyshrimbe9361]

🤘🤘🤘

[@Filbi]

Smok Wawelski sounds like a gym teacher.

[@scottmitchell1974]

Oh!! Smok... dragon... Smaug the dragon... there's no way the linguist Tolkien did this on accident.

[@queenfry7634]

Mega crocs